US Bridges

US 281 over Post Oak Slough

Fair

Archer County, Texas · 1.55 MI S of FM 172 · Structure no. 030050024903011

Built
1929
96 years old, rebuilt 1991
Condition
Fair
inspected December 2023
Type
Culvert
Concrete
Length
35 ft
4 main spans
Daily traffic
4,040
2020 count
Owner
State
State Highway Agency

About this bridge

US 281 over Post Oak Slough is a concrete culvert carrying US 281 over Post Oak Slough in Archer County, Texas. It was built in 1929 and reconstructed in 1991, so it is 96 years old, older than the Texas average of 44.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 4,040 vehicles a day, roughly 16% of them trucks, projected to reach 5,656 by 2040. The structure is 35 ft (10.7 m) long and 46 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesUS 281
CrossesPost Oak Slough
Location1.55 MI S of FM 172
RouteU.S. Route 281
CountyArcher County
StateTexas
Coordinates33.63896, -98.45398
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour evaluation has not been made
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating26 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length35 ft (10.7 m)
Longest span8 ft (2.4 m)
Deck width46 ft (13.9 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,040 (2020)
Projected traffic5,656 by 2040
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 281 over Post Oak Slough built?

It was built in 1929, making it 96 years old in 2025. It was reconstructed in 1991.

What condition is US 281 over Post Oak Slough in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in December 2023.

How much traffic does US 281 over Post Oak Slough carry?

About 4,040 vehicles per day (2020 count), of which roughly 16% are trucks.

How long is US 281 over Post Oak Slough?

The structure is 35 ft (10.7 m) long with a longest span of 8 ft (2.4 m) and a deck 46 ft wide.

Who owns US 281 over Post Oak Slough?

It is owned by the State Highway Agency.