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Concrete utility poles are prestressed concrete columns, made by spin casting or static casting. Spun poles are formed by spinning concrete in a mold around tensioned steel strands, which packs it dense and leaves a hollow core. They resist rot, insects and fire, but they are the heaviest common pole material, which shapes freight and installation. ASTM C1089 covers spun-cast poles.
Centrifugal force does the compacting.
A spun pole starts in a two-piece steel form. Steel strands and a continuous spiral of reinforcing wire go in, the strands are tensioned, and concrete is placed. A machine then spins the form at high speed, compacting the concrete and leaving a hollow core.
“Prestressed” means the strands are stretched before the pole takes load, so the concrete is held in compression and resists cracking. The 1997 ASCE-PCI design guide puts spun concrete at 155 to 165 pounds per cubic foot, against 145 to 150 for statically cast poles. The USDA Rural Utilities Service (RUS) guide specification, Bulletin 1724E-206, asks for at least 8,000 psi concrete in spun poles.
Spun poles are usually round but can be hexagonal or octagonal. Statically cast poles are poured in a stationary form and are most often square.
| Document | Publisher | What it covers |
|---|---|---|
| ASTM C1089-19 (reapproved 2025), Spun Cast Prestressed Concrete Poles | ASTM International | Poles for transmission, distribution and communication lines, streetlights and traffic signals. Acceptance rests on full-scale bending and torsion tests. |
| Guide for the Design of Prestressed Concrete Poles (1997) | Joint ASCE task force and PCI committee, PCI Journal | Configurations, loads, design, manufacturing, testing, erection and foundations for spun and statically cast poles |
| Recommended Practice for the Manufacture and Use of Spun-Cast Precast, Prestressed Concrete Electric Utility Poles (2024) | PCI Prestressed Concrete Poles Committee | Builds on the earlier PCI guides with newer practice for spun-cast utility poles |
| Prestressed Concrete Transmission Pole Structures (MOP 123, 2012) | ASCE | Recommended practice for design and installation of transmission poles |
| Bulletin 1724E-206 (2016) | USDA Rural Utilities Service | Model purchase specification; requires design to ACI 318 and the PCI guide, and also references ASTM C935 for statically cast poles |
Write down how equivalence is defined before you ask for a price.
Wood poles are graded under ANSI O5.1 by a horizontal load applied 2 feet from the top. The ASCE-PCI guide says that if you equate a concrete pole to a wood class, you must tell the supplier how the equivalence is defined, because National Electrical Safety Code (NESC) factors for wood allow for natural variability and decay.
The guide describes two methods. An ultimate-to-ultimate comparison gives the concrete pole the same groundline capacity as a new wood pole of that class. A factored-load comparison scales the wood load by the ratio of NESC load factors; with the 1997 factors (4.0 for wood, 2.5 for concrete), a Class 1 equivalent carries about 2,825 pounds.
| Wood class | ANSI O5.1 wood load, 2 ft from top | Concrete equivalent, NESC Grade B (1997 factors) |
|---|---|---|
| Class 1 | 4,500 lb | 2,825 lb |
| Class 2 | 3,700 lb | 2,325 lb |
| Class 3 | 3,000 lb | 1,875 lb |
| Class 4 | 2,400 lb | 1,500 lb |
| Class 5 | 1,900 lb | 1,200 lb |
Source: ASCE-PCI guide, Table 5.13.2. NESC factors have changed since 1997, so treat the right-hand column as an example of the method, not current values. For guyed poles, sustained bending or extreme wind, the guide recommends designing for the actual loads. It also notes that an equivalent concrete pole deflects much less than wood.
Weight is the main practical difference, and it touches every step.
The ASCE-PCI guide states that concrete poles tend to be heavier than other types of members, and the US Department of Energy (DOE) notes that non-wood poles are lighter than wood except concrete. The guide’s transmission design examples weigh 14,500 to 21,275 pounds.
Concrete does not decay. An Oak Ridge National Laboratory (ORNL) review describes concrete poles as resistant to rot, termites, fire and ice, and notes that recent experience shows a greater ability to survive wildfires. DOE estimates average service life at roughly 60 years for concrete, against 30 to 50 for wood.
Concrete has its own weak point: ORNL names corrosion of the steel reinforcement as the typical failure mode, and DOE notes non-wood poles can be harder to repair. So the specifications keep water away from the steel. RUS requires sealed pole ends and epoxy-sealed cracks, and the ASCE-PCI guide stresses sealing strand ends where water tables are high or poles stand in sea water.
In North America, the ASCE-PCI guide notes that concrete pole use is concentrated in regions such as the southeastern US. Florida Power & Light aimed for all of its transmission structures to be steel or concrete by the end of 2022.
The ASCE-PCI guide describes concrete poles as single cantilevered poles, guyed angle and dead-end structures, and H-frames, plus substation structures.
Concrete also carries distribution lines. Tampa Electric’s 2018 distribution pole count, cited by DOE, was about 5 percent concrete.
ASTM C1089 covers poles for streetlights and traffic signals as well as power and communication lines. The guide adds highway sign structures.
Direct embedment is the most common foundation for concrete poles, according to the ASCE-PCI guide. Crews set the pole in a drilled hole and backfill with compacted sand, gravel or concrete, or use a jetting device that displaces soil with water pressure, which suits granular or loose soils. The alternatives are a cast-in-place concrete pier, which can use a steel base plate on anchor bolts, or a precast foundation.
Under the RUS specification, the owner sets embedment depth and the point of fixity. The foundation designer needs soil information, and site conditions may call for soil testing. RUS also describes cant holes, through holes near the groundline used to rotate the pole during setting.
General differences, from public guidance. Your engineer’s design governs.
| Factor | Spun concrete | Treated wood | Galvanized steel |
|---|---|---|---|
| Relative weight | Heaviest | Lighter than concrete | Lighter than wood (DOE) |
| Rot and insects | Resists rot and termites | Needs preservative; subject to decay and woodpeckers | Resists decay and wildlife damage |
| Fire | Resistant | Combustible | More fire-resistant than wood |
| Main long-term concern | Corrosion of reinforcement | Decay at the groundline | Corrosion at the groundline |
| Estimated average service life (DOE) | About 60 years | 30 to 50 years | About 80 years |
| Key documents | ASTM C1089, ASCE-PCI guide, RUS 1724E-206 | ANSI O5.1 | ASCE/SEI 48, ASTM A123 |
A competitively solicited cooperative contract, free for eligible public agencies to use.
BIDR Technologies holds Sourcewell Contract #060326-BIDR, “Utility Poles with Related Equipment, Supplies, and Services,” through August 5, 2030. Sourcewell’s utility pole solicitation (#11229) lists one awarded contract: BIDR’s. The catalog includes spun concrete poles from 25 to 70 feet in 5-foot steps, Classes 1 to 5, with delivery and site drop in the contiguous US, installation with crew and equipment, and pole loading analysis available. See the utility pole contract page.
To buy, register your agency with Sourcewell (free for government and education entities), request a quote, then finalize with the contract number and your agency’s Sourcewell account number. The cooperative contracts guide explains the process; the pole materials and steel pole guides compare options.
You get a written quote at contract pricing with a delivery timeline. Request concrete pole pricing.
Spun poles are cast in a rotating form, which makes dense concrete and a hollow core; they are usually round. Statically cast poles are poured in a stationary form, are most often square, and can be solid or hollow. ASTM C1089 covers spun poles, and RUS also references ASTM C935 for statically cast poles.
It depends on length, class and wall thickness, so ask for the calculated weight, which RUS requires on the drawings. As one reference point, an Oak Ridge National Laboratory comparison table lists representative 45-foot poles at about 3,793 pounds for concrete and 1,315 pounds for penta-treated wood.
Some cracking under load is expected. The ASCE-PCI guide says poles should arrive uncracked, closed circumferential cracks keep the designed ultimate capacity, and hairline cracks are normally harmless in noncorrosive settings. Circumferential cracks that will not close indicate overstretched steel, and those poles should be replaced. Other open cracks need investigation and sealing.
DOE’s Grid Deployment Office estimates average service life at roughly 60 years for concrete poles, compared with 30 to 50 years for wood. Life depends on keeping water away from the steel, which is why specifications require sealed ends, sealed cracks and adequate concrete cover.
Send lengths, classes, embedment and delivery site for a written quote at Sourcewell contract pricing. Call 321-576-3147 or email [email protected].