US Bridges

SH 171 over Pin Oak Crk

Fair

Limestone County, Texas · 4.80 MI NW of FM 73 · Structure no. 091470041902001

Built
1938
87 years old, rebuilt 1958
Condition
Fair
inspected November 2024
Type
Tee Beam
Concrete
Length
173 ft
5 main spans
Daily traffic
2,239
2023 count
Owner
State
State Highway Agency

About this bridge

SH 171 over Pin Oak Crk is a concrete tee beam carrying SH 171 over Pin Oak Crk in Limestone County, Texas. It was built in 1938 and reconstructed in 1958, so it is 87 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 2,239 vehicles a day, roughly 19% of them trucks, projected to reach 2,270 by 2038. The structure is 173 ft (52.7 m) long and 33 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesSH 171
CrossesPin Oak Crk
Location4.80 MI NW of FM 73
RouteState Highway 171
CountyLimestone County
StateTexas
Coordinates31.80024, -96.71778
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51 US tons
Inventory rating31 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadH 15
Structure length173 ft (52.7 m)
Longest span35 ft (10.7 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,239 (2023)
Projected traffic2,270 by 2038
Trucks19%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$400,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 171 over Pin Oak Crk built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1958.

What condition is SH 171 over Pin Oak Crk 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 November 2024.

How much traffic does SH 171 over Pin Oak Crk carry?

About 2,239 vehicles per day (2023 count), of which roughly 19% are trucks.

How long is SH 171 over Pin Oak Crk?

The structure is 173 ft (52.7 m) long with a longest span of 35 ft (10.7 m) and a deck 33 ft wide.

Who owns SH 171 over Pin Oak Crk?

It is owned by the State Highway Agency.