US Bridges

South ST over Mustang Bayou

Fair

Brazoria County, Texas · 0.10 MI W of SH 35 · Structure no. 120200D01180002

Built
2013
12 years old
Condition
Fair
inspected October 2024
Type
Other
Prestressed Concrete
Length
122 ft
3 main spans
Daily traffic
5,948
2022 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

South ST over Mustang Bayou is a prestressed concrete other carrying South ST over Mustang Bayou in Brazoria County, Texas. It was built in 2013, so it is 12 years old, younger 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 5,948 vehicles a day, roughly 3% of them trucks, projected to reach 8,000 by 2031. The structure is 122 ft (37.2 m) long and 51 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSouth ST
CrossesMustang Bayou
Location0.10 MI W of SH 35
RouteCity Street 0
CountyBrazoria County
StateTexas
Coordinates29.40946, -95.23407
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
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 inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeOther
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length122 ft (37.2 m)
Longest span40 ft (12.2 m)
Deck width51 ft (15.6 m)
Roadway width42 ft (12.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,948 (2022)
Projected traffic8,000 by 2031
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was South ST over Mustang Bayou built?

It was built in 2013, making it 12 years old in 2025.

What condition is South ST over Mustang Bayou 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 October 2024.

How much traffic does South ST over Mustang Bayou carry?

About 5,948 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is South ST over Mustang Bayou?

The structure is 122 ft (37.2 m) long with a longest span of 40 ft (12.2 m) and a deck 51 ft wide.

Who owns South ST over Mustang Bayou?

It is owned by the Town or Township Highway Agency.