High Mast Pole Foundation & Wind Load Guide: Anchor Bolts, Base Plate and Structural Review

Quick Answer

High mast pole foundation size, anchor bolts, base plate thickness and wind-load resistance cannot be selected from pole height alone.

A 25m, 30m or 35m high mast pole does not have one universal foundation size. The correct foundation and base connection must be reviewed using project-specific wind criteria, soil and geotechnical data, pole reactions, luminaire weight, effective projected area, headframe configuration, anchor layout, local codes and qualified structural calculation.

Rules such as “foundation depth equals pole height divided by six” or “30m high mast pole equals one fixed concrete block size” are unsafe for formal EPC, municipal, highway, port, airport or industrial projects. They may help with rough cost discussion only when clearly marked as preliminary, but they should not be used for construction drawings, anchor bolt ordering or site installation.

A complete review should define:

• Governing code and edition.
• Wind-speed definition and design basis.
• Exposure or terrain category.
• Risk category or return period.
• Topographic and special wind factors.
• Soil and geotechnical parameters.
• Pole height and shaft geometry.
• Luminaire quantity, weight and effective projected area.
• Headframe, brackets and accessories.
• Base reactions and load combinations.
• Anchor bolt layout, bolt circle and template.
• Base plate and pole-to-base connection.
• Foundation type and local soil behavior.
• Installation tolerances and as-built verification.
• Fatigue, corrosion and inspection requirements.

This article is a structural input and review guide. It is not a substitute for project-specific calculations by qualified structural and geotechnical professionals.

Terminology Note: Anchor Bolts and Anchor Rods

This guide uses “anchor bolts” as the common project term. Some structural standards and drawings use “anchor rods.” The project documents should define the term clearly and use one consistent definition across pole drawings, foundation drawings, templates, procurement records and site installation documents.

Project Review Summary

Item	Project Review Point
Main Topic	High mast pole foundation, wind load, anchor bolts and structural input review
Main Question	What information is required before a high mast foundation or anchor system can be reviewed?
Best-Fit Projects	EPC, municipal, highway, port, airport, logistics, industrial, mining and retrofit high mast projects
Main Risk	Selecting foundation size or anchor bolts from pole height alone
Critical Inputs	Wind criteria, soil data, pole height, pole reactions, luminaire weight, EPA, headframe and anchor layout
Required Review	Qualified structural calculation, geotechnical input, project code requirements and interface drawings
Typical Deliverables	Pole drawing, base plate drawing, anchor bolt layout, reaction loads, luminaire weight/EPA, shop drawings and structural coordination inputs
Project Benefit	Reduces foundation mismatch, anchor-setting errors, incomplete wind criteria and responsibility gaps

Why No Standard Foundation Size Exists

Many buyers search for a simple answer:

What is the foundation size for a 30m high mast pole?

The correct answer is:

Pole height alone is insufficient to determine foundation dimensions.

A high mast foundation must resist structural effects from the entire system, not only the vertical height of the pole.

The same 30m high mast pole may require different foundations depending on:

• Wind-speed criteria.
• Wind-speed definition.
• Exposure or terrain category.
• Soil bearing and lateral resistance.
• Groundwater condition.
• Foundation type.
• Pole shaft diameter and wall thickness.
• Luminaire quantity.
• Luminaire weight.
• Luminaire effective projected area.
• Headframe design.
• Lowering system.
• Accessories such as cameras, antennas or obstruction lights.
• Design life.
• Fatigue requirements.
• Local code and authority requirements.

A fixed foundation table without these inputs can be misleading.

Why Experience Rules Are Risky

Some commercial pages or field discussions use simplified rules such as:

Foundation depth = pole height ÷ 6

or:

30m high mast = fixed concrete size and fixed anchor bolt size

These rules do not define wind speed, soil condition, EPA, load combinations, safety factors, local code or foundation type. They may also ignore fatigue, corrosion, uplift, overturning, settlement and construction tolerances.

A project team may use experience-based dimensions only for early budgeting or site planning. Formal drawings should be based on structural and geotechnical review.

Governing Codes and Wind-Speed Definitions

Wind-load review begins with the governing design basis.

A phrase such as “designed for 100 mph wind” is incomplete unless the project also defines:

• Governing code and edition.
• Wind-speed definition.
• Averaging time.
• Risk category or return period.
• Exposure or terrain category.
• Topographic factor.
• Directionality factor.
• Importance factor if applicable.
• Height or elevation influence.
• Special hurricane, typhoon or coastal region requirements.
• Strength and serviceability criteria.
• Fatigue wind criteria where required.
• Owner, consultant or transportation-authority requirements.

Never compare wind-speed ratings unless the governing code, wind-speed definition, exposure, risk category and design basis are also stated.

A “100 mph” wind speed in one standard may not equal “100 mph” in another standard if the averaging time, exposure or design basis differs.

Wind Design Basis Table

Input	Project Value	Source
Governing code and edition		Authority / tender
Wind-speed definition		Code
Basic / design wind speed		Project criteria
Risk category / return period		Code / owner
Exposure / terrain		Site assessment
Topographic factor		Site assessment
Design life		Owner
Fatigue wind criteria		Applicable structural standard
Special wind region		Local authority / consultant
Ice, seismic or other environmental load		Code / site condition

Agency Standards Are Project-Specific

Some transportation agencies publish standard high mast details, pole heights, wind-speed criteria, foundation sheets or construction specifications. These can be very useful when the project is under that authority.

For example, TxDOT’s Highway Illumination Manual describes high mast lighting assemblies, standard pole heights, high mast illumination pole standards, foundation details and agency-specific design wind-speed sheets. These requirements are useful for TxDOT projects, but they should not be copied directly into other countries, private industrial projects or unrelated tenders without confirming the governing project standard.

The correct question is not “What does one agency use?” but:

Which code, edition, wind definition and authority requirement governs this project?

Required Structural and Geotechnical Inputs

A qualified foundation review requires coordinated inputs from lighting, pole, luminaire, geotechnical and structural parties.

Foundation Review Input Table

Input	Why It Matters	Evidence Required
Pole height	Affects bending moment and foundation demand	Pole drawing
Governing code and edition	Defines design basis	Tender / authority requirement
Wind-speed definition	Prevents incorrect wind-speed comparison	Code / project criteria
Design wind speed	Defines wind pressure basis	Local code / tender
Exposure / terrain category	Affects wind pressure	Site assessment
Soil and geotechnical data	Determines foundation type and size	Geotechnical report
Luminaire quantity	Affects headframe load and EPA	Luminaire schedule
Fixture weight	Affects ring, shaft and foundation load	Datasheet
Effective projected area	Affects wind-load calculation	Datasheet / structural input
Headframe type	Affects load distribution	Structural drawing
Anchor bolt layout	Affects base connection	Anchor bolt drawing
Base plate design	Transfers load to anchor system	Pole drawing
Lowering system	Adds service and mechanical loads	System drawing
Accessories	Add weight and exposed area	Accessory schedule
Required design life	Affects structural and fatigue review	Owner / tender
Corrosion environment	Affects material and protection strategy	Site condition / specification

A single value such as “soil bearing capacity” may not be enough. Depending on the foundation type, the geotechnical report may also need to provide soil layers, groundwater, unit weight, friction angle, cohesion, lateral subgrade parameters, settlement criteria, frost depth, scour risk and construction constraints.

Wind Load and Effective Projected Area

Wind load on a high mast system comes from the pole shaft, luminaires, brackets, headframe, lowering system and accessories.

The taller the structure, the more important it becomes to define the wind-loading basis clearly.

What Effective Projected Area Means

Effective projected area, often called EPA, is a structural wind-load input representing the aerodynamic effect of exposed equipment.

It should not be simplified as:

EPA = fixture length × fixture width

The project must confirm what the supplier’s declared EPA represents.

EPA review should consider:

• Luminaire exposed area.
• Shape or drag coefficient.
• Mounting orientation.
• Luminaire tilt.
• Headframe and bracket exposure.
• Accessories.
• Pole shaft wind area.
• Multiple fixtures and possible shielding or group effects.
• Worst wind direction.
• Applicable code method.

EPA Review Table

Item	Why It Matters	Must Confirm
Luminaire EPA	Affects wind load from fixtures	Supplier definition and orientation
Headframe EPA	Adds exposed area at mast top	Headframe drawing
Bracket EPA	Adds local exposed area	Bracket drawing
Pole shaft wind area	Often major contributor	Pole shaft drawing
Mounting angle	Changes exposed area and wind effect	Aiming / installation drawing
Accessory loads	Cameras, antennas or signs may add load	Accessory schedule
Worst wind direction	Controls design case	Structural calculation
EPA definition	Avoids supplier-to-supplier mismatch	Datasheet / calculation note

Do not add EPA values from different suppliers blindly unless the same definition, mounting orientation and structural method are confirmed.

Headframe, Luminaire and Accessory Loads

High mast poles often support multiple luminaires on a ring, crossarm or headframe.

The structure must account for:

• Luminaire quantity.
• Individual fixture weight.
• Total fixture weight.
• Luminaire EPA.
• Headframe weight.
• Headframe EPA.
• Bracket weight.
• Bracket EPA.
• Obstruction lights.
• Cameras, antennas or sensors.
• Cable and junction box weight.
• Lowering-system components.
• Maintenance and service loads where required.

Luminaire wattage does not define structural load.

A lower-wattage LED luminaire may still have higher weight or higher EPA than another fixture. A retrofit from HID to LED may reduce electrical load while increasing or changing wind-exposed area.

For structural review, use the actual luminaire datasheet, mounting bracket drawing and headframe arrangement.

Structural Load Path and Load Combinations

A high mast structure must transfer load through a continuous path:

luminaire / headframe
→ pole shaft
→ shaft joints and welds
→ pole-to-base connection
→ base plate
→ anchor rods
→ reinforced concrete foundation
→ soil

If one interface is unclear, the entire design may be difficult to verify.

Load Types to Consider

Wind load is not the only structural input. Depending on the project and governing code, structural review may need to consider:

• Pole self-weight.
• Luminaire and headframe dead load.
• Wind load.
• Wind-induced vibration.
• Fatigue.
• Vortex shedding.
• Galloping.
• Natural wind gusts.
• Ice load where applicable.
• Seismic load where applicable.
• Maintenance and lowering loads.
• Construction and erection loads.
• Impact or accidental loads where required.
• Loads from cameras, antennas, signs or other attachments.

Static wind strength alone does not complete the structural review.

FHWA research on high-mast and other flexible roadside structures discusses the importance of wind-induced vibration, fatigue and welded connection details. That does not create a universal design rule, but it shows why high mast structures should not be treated as simple static poles only.

Pole Reaction Interface Table

Reaction	Units	Load Combination	Coordinate Direction
Axial force
Base shear X
Base shear Y
Overturning moment X
Overturning moment Y
Torsion

A single maximum moment value is usually not enough for foundation design unless the load combination, coordinate system, sign convention and concurrent reactions are also defined.

Required Reaction Clarifications

Input	Required Clarification
Reaction reference point	Top of concrete, underside of base plate, pole base centerline or another defined elevation
Units	kN / kN·m, kip / kip-ft or other stated unit system
Concurrent reactions	Which axial force, shear, moment and torsion act together
Factoring basis	Service, allowable, factored, ultimate or project-specific basis
Coordinate system	X/Y directions, sign convention and relation to pole or roadway orientation
Load combination	Wind direction, dead load, service load, fatigue case or other governing combination

The reference point matters. The same overturning case may produce different foundation-interface values if the moment is reported at the underside of the base plate, top of concrete or another elevation.

The foundation engineer should know whether reactions are service-level, factored, ultimate, allowable, governing wind direction, or another basis defined by the project standard.

Pole Shaft, Welds, Base Connection and Slip Joints

The pole shaft is not only a vertical tube. It is part of the structural system.

Review items may include:

• Shaft material grade.
• Shaft diameter and taper.
• Wall thickness.
• Shaft section length.
• Slip joint length.
• Longitudinal seam welds.
• Circumferential weld limitations.
• Access door reinforcement.
• Pole-to-base weld.
• Base plate flatness.
• Hot-dip galvanizing.
• Drainage and corrosion protection.
• Fabrication tolerances.
• Erection tolerances.

For high mast poles, fatigue-sensitive details may include welded connections near the base plate and access openings, depending on design and service conditions.

The project should not approve a pole only because the height and wall thickness appear reasonable. It should review the fabrication details, design basis and inspection requirements.

Anchor Bolts, Base Plate and Bolt Circle Review

The base connection transfers pole reactions into the foundation.

It must be coordinated before anchor bolts are ordered or cast into concrete.

Check:

• Anchor bolt quantity.
• Anchor bolt diameter.
• Anchor rod material and grade.
• Thread length.
• Galvanized length.
• Bolt circle / pitch circle diameter.
• Bolt hole diameter.
• Anchor projection above concrete.
• Anchor embedment length.
• Anchor plate or anchor cage.
• Top and bottom templates.
• Nuts and washers.
• Leveling nuts.
• Grout or no-grout detail.
• Base plate diameter or dimensions.
• Base plate thickness.
• Pole-to-base weld detail.
• Conduit location.
• Reinforcement clearance.
• Installation tolerances.
• Final as-built position.

Anchor Bolt and Base Plate Interface

The anchor layout must match:

foundation reinforcement
→ anchor cage / template
→ bolt circle
→ base plate holes
→ pole orientation
→ conduit opening
→ headframe orientation

If the bolt circle is wrong, the pole may not fit the foundation. If the conduit is wrong, the electrical cable may not enter the pole correctly. If the bolt projection is wrong, leveling and nut engagement may fail.

TxDOT Item 613 is an agency-specific example showing that high mast poles include the pole and anchor bolts, and that pole and anchor-bolt requirements are controlled by project plans and specifications. This is not a universal detail, but it shows why anchor bolts should be treated as a coordinated construction interface, not as a loose procurement item.

Foundation and Soil Review

High mast foundations may include different foundation types depending on site conditions and project standards.

Possible foundation types include:

• Drilled shaft / caisson.
• Spread footing.
• Pile foundation.
• Rock anchor.
• Mat or combined foundation.
• Other project-specific foundation systems.

If an RFQ asks for a required or preferred foundation type, it should be treated as a project input that still needs structural and geotechnical confirmation.

Foundation selection may depend on:

• Soil layers.
• Allowable or ultimate bearing capacity.
• Lateral soil resistance.
• Groundwater level.
• Uplift.
• Overturning.
• Sliding.
• Settlement.
• Frost depth.
• Scour.
• Ground slope.
• Fill material or soft soil.
• Drainage.
• Corrosion environment.
• Construction access.
• Nearby utilities.
• Excavation limitations.
• Project authority requirements.

A high mast foundation should be designed or confirmed by the assigned structural and geotechnical professionals.

A supplier can often provide pole drawings, base plate details, anchor bolt layout, luminaire weight/EPA and reaction loads. The final foundation calculation may need local geotechnical data and local code compliance.

Lowering System and Maintenance Load Review

Many high mast systems include a lowering system for maintenance.

The lowering system may add:

• Ring weight.
• Cable load.
• Hoisting equipment load.
• Service load.
• Dynamic effects during operation.
• Additional mechanical components.
• Electrical and control interfaces.
• Maintenance access requirements.

The foundation and pole review should consider the complete high mast assembly, not only the pole shaft.

For retrofit projects, changing the luminaire type or quantity can change the ring load and lowering-system behavior.

Maintenance operation should be checked for:

• Safe lowering and raising.
• Balanced ring load.
• Cable condition.
• Winch or power drive condition.
• Obstruction clearance.
• Service access.
• Electrical disconnection or protection.
• Inspection interval.

Installation Tolerances and As-Built Verification

A structurally correct design can still fail at installation if anchor bolts, templates, reinforcement or conduit are misplaced.

Installation QA Table

Item	What to Check	Why It Matters
Anchor template	Correct bolt circle and orientation	Prevents installation mismatch
Anchor bolt projection	Correct exposed length	Allows leveling, washers and nuts
Bolt alignment	Verticality and spacing	Prevents base plate fit-up failure
Concrete strength	Meets design requirement before erection	Supports safe installation
Reinforcement layout	No conflict with anchor cage or conduit	Prevents field rework
Conduit location	Matches pole base opening	Prevents cable routing problems
Nut tightening	Follows specified procedure	Supports connection performance
Grout or leveling detail	Matches design	Affects load transfer
Corrosion protection	Galvanizing or repair completed	Supports durability
As-built survey	Records actual bolt and pole position	Supports acceptance and maintenance
Pole verticality	Matches erection tolerance	Supports serviceability
Orientation	Matches lighting and headframe direction	Avoids aiming and fit-up problems
Foundation top elevation	Matches design and site grading	Prevents burial, fit-up or drainage problems
Slope away from base	Water drains away from pole base	Reduces long-term corrosion risk
Standing-water prevention	No ponding around base plate or anchors	Protects anchor bolts and base connection
Conduit sealing	Conduit entries sealed where required	Reduces water ingress and cable damage
Interface corrosion protection	Exposed galvanizing repairs or coating completed	Supports durability at base plate and anchors

The as-built record is important for future maintenance, replacement and retrofit decisions.

Inspection, Fatigue and Corrosion Review

High mast poles are tall, flexible exposed structures. Their long-term performance depends on more than original design strength.

Inspection may need to review:

• Base plate corrosion.
• Anchor bolt corrosion.
• Nut and washer condition.
• Pole-to-base weld.
• Access opening reinforcement.
• Shaft corrosion.
• Galvanizing damage.
• Slip joint condition.
• Cracks at welded details.
• Foundation cracking.
• Settlement or tilt.
• Water accumulation.
• Headframe condition.
• Ring and lowering system.
• Cable and electrical components.
• Vibration or unusual movement.

FHWA inspection guidance for structural supports, although archived, discusses installation, inspection, maintenance and repair concerns for highway signs, luminaires and traffic-signal supports. It is useful background for understanding why high mast poles should be inspected as structural assets, not only as lighting equipment.

Corrosion and fatigue review is especially important in:

• Coastal areas.
• Industrial areas.
• Ports.
• Mining sites.
• High-wind regions.
• Sites with poor drainage.
• Older retrofit projects.
• Projects with incomplete original drawings.

Retrofit Projects: Can the Existing Foundation Be Reused?

An existing foundation should not be reused by assumption.

Lower LED wattage does not automatically mean the old foundation is adequate. Structural demand may change because the new LED fixtures may have different weight, dimensions, EPA, mounting orientation or headframe arrangement.

Retrofit Foundation Review Table

Existing Item	Retrofit Risk	Must Verify
Existing foundation	Unknown design basis	Original drawings or structural assessment
Existing anchor bolts	Corrosion, damage or insufficient capacity	Inspection and calculation
Existing pole shaft	Fatigue, corrosion or outdated wind criteria	Pole condition survey
Existing base plate weld	Fatigue-sensitive detail	Inspection and structural review
New LED fixtures	Different weight and EPA	Datasheet and mounting review
New headframe	Different load distribution	Structural compatibility
Lowering system	Changed ring load	Safe operation test
Current code requirement	May differ from original design	Local engineer / authority review
New accessories	Added exposed area and weight	Accessory load review
Site changes	Soil, drainage or surrounding exposure may change	Site reassessment

If the original design basis cannot be confirmed, treat it as an information gap. Do not assume hidden reserve capacity.

For retrofit planning, also review the High Mast LED Retrofit Guide.

Responsibility Matrix for Pole, Foundation and Structural Review

Structural responsibility must be assigned explicitly in the contract; it should not be inferred from normal supplier practice.

Different projects may use different responsibility models:

• Supplier-designed pole with local foundation design.
• EPC-integrated structural design.
• Consultant-designed foundation.
• Manufacturer providing reaction loads only.
• Turnkey supplier responsible for full structural design.
• Authority-standard drawings with project-specific validation.

Responsibility Matrix

Deliverable	Required Provider	Reviewer / Approver	Contract Must Clarify
Governing wind criteria	Project / authority	Structural engineer	Code, edition and wind definition
Pole reactions	Pole designer / supplier	Foundation engineer	Load combinations and coordinate system
Luminaire weight and EPA	Luminaire supplier	Pole designer	Exact model and mounting orientation
Pole calculation	Assigned structural designer	Consultant / authority	Professional seal if required
Foundation calculation	Assigned foundation designer	Consultant / authority	Geotechnical basis
Anchor layout	Pole / foundation interface owner	Both designers	Bolt circle, projection and tolerances
Shop drawings	Fabricator / supplier	Project reviewer	Submission and approval process
Installation method	Contractor / EPC	Site engineer / authority	Tolerances, QA and safety procedure
As-built records	Contractor / EPC	Owner / consultant	Measurement and acceptance format

The contract should define which party supplies, checks and approves each structural document.

Tender / RFQ Checklist for Structural Inputs

A good RFQ should not ask only for “30m high mast pole price.”

It should define the structural input package required for review.

Tender / RFQ Checklist

RFQ Item	Why It Matters
Project location	Defines wind, corrosion and local code context
Governing code and edition	Defines design basis
Wind-speed definition	Prevents incorrect comparison
Design wind speed	Required for pole and foundation review
Exposure / terrain category	Affects wind pressure
Geotechnical report	Required for foundation design
Pole height	Main geometry input
Pole shaft drawing	Required for structural review
Luminaire quantity	Affects headframe load
Luminaire weight	Affects dead load
Luminaire EPA	Affects wind load
Headframe drawing	Defines load distribution
Lowering system details	Defines service and mechanical load
Base plate drawing	Defines connection interface
Anchor bolt drawing	Required for civil works
Reaction loads	Required for foundation engineer
Load combinations	Needed to interpret reactions
Corrosion protection	Supports durability
Installation tolerance	Prevents construction mismatch
Shop drawing requirement	Defines approval process
Professional seal requirement	Defines responsibility and jurisdiction

Copyable RFQ Template

Project location:
Application:
Pole height:
Number of masts:
Luminaire quantity per mast:
Luminaire model:
Luminaire weight:
Luminaire EPA:
Headframe type:
Lowering system:
Accessories:
Governing code and edition:
Wind-speed definition:
Design wind speed:
Exposure / terrain category:
Risk category / return period:
Special wind / seismic / ice condition:
Geotechnical report available:
Required, preferred or anticipated foundation type, if already defined:
Required deliverables:
Required reaction format:
Anchor bolt drawing required:
Base plate drawing required:
Professional seal required:
Tender / authority review process:

Common Foundation and Wind Load Mistakes

Mistake	Why It Creates Risk	Better Review Method
Selecting foundation size from pole height only	Ignores wind, soil, EPA and code	Use project-specific structural calculation
Using a fixed 30m foundation table	May not match site conditions	Confirm wind and geotechnical inputs
Comparing wind speed without definition	Different standards use different bases	State code, edition, exposure and wind definition
Treating EPA as length × width	Ignores aerodynamic definition	Confirm supplier EPA definition and orientation
Ignoring luminaire and headframe loads	Understates top load	Use actual datasheets and drawings
Ignoring pole reactions	Foundation engineer lacks design input	Provide axial, shear, moment and torsion
Ordering anchor bolts before final drawings	Bolt circle may not match base plate	Coordinate template, base plate and foundation
Ignoring conduit and rebar conflicts	Causes field rework	Check anchor cage and civil details
Assuming lower LED wattage reduces structural demand	Weight and EPA may not reduce	Compare actual fixture data
Reusing old foundations without review	Original basis may be unknown	Inspect, measure and recalculate
Checking only static wind strength	Fatigue and vibration may matter	Review applicable fatigue and inspection requirements
Leaving responsibility unclear	Creates approval and liability gaps	Define provider, reviewer and approver in contract

Request a High Mast Structural Input Review

High mast foundation, wind load, anchor bolts and base plate details should be reviewed before civil construction and anchor bolt procurement.

Send us your project location, pole height, luminaire quantity, luminaire weight and EPA, headframe type, design wind criteria, geotechnical information and required tender deliverables. Sunlurio can support pole drawings, luminaire data, anchor-bolt coordination inputs, IES/LDT files, DIALux coordination and BOQ documentation for high mast lighting projects.

Request a High Mast Structural Input Review

Related High Mast Lighting Guides

The following guides explain related high mast project decisions:

• High Mast Pole Height Guide
• High Mast Light Wattage Guide
• High Mast LED Retrofit Guide
• High Mast Lighting Level Specification Guide
• High Mast Pole Spacing Guide
• High Mast Lighting Layout Patterns
• How Many High Mast Lights Do You Need?
• High Mast Lighting Coverage Explained
• High Mast Lighting Systems
• Engineering Support for Lighting Projects
• Drawings and Datasheets
• Tender Documents and BOQ Support

Frequently Asked Questions

What is the standard foundation size for a 30m high mast pole?

There is no universal standard foundation size for a 30m high mast pole. Foundation size depends on wind criteria, soil conditions, pole reactions, luminaire weight, EPA, headframe, foundation type and local structural code.

Can foundation depth be estimated as pole height divided by six?

That rule may appear in informal discussions, but it should not be used for final design. It does not define wind speed, soil condition, load combinations, EPA, code requirements or safety factors.

What information is needed before foundation design?

At minimum, the project should define pole height, wind criteria, soil and geotechnical data, luminaire quantity, fixture weight, EPA, headframe type, pole reactions, base plate drawing and anchor bolt layout.

What is EPA in high mast pole design?

EPA means effective projected area. It is a wind-load input representing the aerodynamic effect of exposed equipment. The project must confirm the supplier’s EPA definition, mounting orientation and whether drag effects are included.

Does luminaire wattage affect wind load?

Wattage does not directly define structural load. Structural review uses fixture weight, dimensions, EPA, mounting orientation and quantity. A lower-wattage LED fixture may still have significant weight or exposed area.

Who designs the high mast foundation?

This depends on the contract. The supplier may provide pole drawings, base details, reaction loads and luminaire data. The final foundation design is often confirmed by a local structural or geotechnical engineer using project-specific soil and code requirements.

What are pole reactions?

Pole reactions are the forces and moments transferred from the pole to the foundation. They may include axial force, base shear, overturning moment and torsion under defined load combinations.

Can an existing foundation be reused in a retrofit project?

Possibly, but it must be verified. The project should check original drawings, design wind basis, anchor bolts, pole condition, corrosion, fatigue, new fixture weight, new EPA and current code requirements.

Why are anchor bolt templates important?

Anchor bolt templates keep the bolts in the correct position and orientation during concrete placement. A wrong bolt circle or projection can prevent the base plate from fitting during installation.

Should fatigue be reviewed for high mast poles?

Fatigue may be relevant for tall, flexible high mast structures, especially in windy locations or where welded details and dynamic wind effects are critical. The applicable structural standard and project engineer should determine the fatigue review requirement.

Can Sunlurio provide foundation calculations?

Sunlurio can support high mast project inputs such as pole drawings, luminaire weight and EPA, anchor layout coordination, datasheets and project documentation. Final foundation calculation responsibility should be defined by the contract and confirmed by qualified structural and geotechnical professionals according to local requirements.

Engineering References

The following references are engineering background sources. They do not create a universal foundation size or anchor-bolt design for all high mast projects.

• FHWA Fatigue Testing of Galvanized and Ungalvanized Socket Connections — background on wind-induced vibration, fatigue and welded socket connection behavior for highmast light poles and related structures.
• FHWA Ancillary Structures Inspection Reference Manual — background for inspection of ancillary highway structures, including high mast lighting.
• TxDOT Item 613: High Mast Illumination Poles — agency-specific example showing that high mast poles include the pole and anchor bolts.
• TxDOT Highway Illumination Manual: High Mast Lighting Assemblies — agency-specific context showing that Item 613 covers poles and anchor bolts, Item 416 covers foundations, standard pole heights and wind speeds are part of the TxDOT system, and HMIF sheets provide TxDOT foundation details.
• FHWA Guidelines for the Installation, Inspection, Maintenance and Repair of Structural Supports for Highway Signs, Luminaires, and Traffic Signals — archived background guidance for structural support inspection and maintenance.
• AASHTO structural-support standards, ASCE 7, ACI 318, AISC, AWS D1.1, ASTM F1554 and local codes where adopted by the project — use only when the project specifically defines the applicable standard, edition and jurisdiction.