US Bridges

FM 671 over Big Slough

Good

Caldwell County, Texas · 1.8 MI SW US 183 · Structure no. 140280106001010

Built
1962
63 years old
Condition
Good
inspected October 2024
Type
Culvert
Concrete
Length
33 ft
5 main spans
Daily traffic
729
2023 count
Owner
State
State Highway Agency

About this bridge

FM 671 over Big Slough is a concrete culvert carrying FM 671 over Big Slough in Caldwell County, Texas. It was built in 1962, so it is 63 years old, older than the Texas average of 44.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 729 vehicles a day, roughly 6% of them trucks, projected to reach 1,021 by 2042. The structure is 33 ft (10.1 m) long and 38 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesFM 671
CrossesBig Slough
Location1.8 MI SW US 183
RouteState Highway 671
StateTexas
Coordinates29.78555, -97.68005
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionOctober 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadUnknown
Structure length33 ft (10.1 m)
Longest span6 ft (1.8 m)
Deck width38 ft (11.6 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic729 (2023)
Projected traffic1,021 by 2042
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 FM 671 over Big Slough built?

It was built in 1962, making it 63 years old in 2025.

What condition is FM 671 over Big Slough in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.

How much traffic does FM 671 over Big Slough carry?

About 729 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is FM 671 over Big Slough?

The structure is 33 ft (10.1 m) long with a longest span of 6 ft (1.8 m) and a deck 38 ft wide.

Who owns FM 671 over Big Slough?

It is owned by the State Highway Agency.