US Bridges

FM 977 over Mustang Creek

Fair

Leon County, Texas · 3.65 MI SW of IH 45 · Structure no. 171450114702001

Built
1949
76 years old
Condition
Fair
inspected February 2023
Type
Culvert
Concrete
Length
25 ft
2 main spans
Daily traffic
336
2020 count
Owner
State
State Highway Agency

About this bridge

FM 977 over Mustang Creek is a concrete culvert carrying FM 977 over Mustang Creek in Leon County, Texas. It was built in 1949, so it is 76 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 336 vehicles a day, roughly 13% of them trucks, projected to reach 590 by 2033. The structure is 25 ft (7.6 m) long and 33 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesFM 977
CrossesMustang Creek
Location3.65 MI SW of IH 45
RouteState Highway 977
CountyLeon County
StateTexas
Coordinates31.1333, -96.03528
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than 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 spans2
Design loadH 15
Structure length25 ft (7.6 m)
Longest span8 ft (2.4 m)
Deck width33 ft (10.2 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic336 (2020)
Projected traffic590 by 2033
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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 977 over Mustang Creek built?

It was built in 1949, making it 76 years old in 2025.

What condition is FM 977 over Mustang Creek 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 February 2023.

How much traffic does FM 977 over Mustang Creek carry?

About 336 vehicles per day (2020 count), of which roughly 13% are trucks.

How long is FM 977 over Mustang Creek?

The structure is 25 ft (7.6 m) long with a longest span of 8 ft (2.4 m) and a deck 33 ft wide.

Who owns FM 977 over Mustang Creek?

It is owned by the State Highway Agency.