US Bridges

SH 6 over Mustang Bayou

Good

Brazoria County, Texas · 2.45 MI W.Of SH35 Bus · Structure no. 120200019202053

Built
1934
91 years old, rebuilt 1997
Condition
Good
inspected November 2024
Type
Culvert
Concrete
Length
43 ft
4 main spans
Daily traffic
23,913
2020 count
Owner
State
State Highway Agency

About this bridge

SH 6 over Mustang Bayou is a concrete culvert carrying SH 6 over Mustang Bayou in Brazoria County, Texas. It was built in 1934 and reconstructed in 1997, so it is 91 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 23,913 vehicles a day, roughly 5% of them trucks, projected to reach 24,150 by 2033. The structure is 43 ft (13.1 m) long and 101 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSH 6
CrossesMustang Bayou
Location2.45 MI W.Of SH35 Bus
RouteState Highway 6
CountyBrazoria County
StateTexas
Coordinates29.44241, -95.28309
Functional classUrban Other Principal Arterial

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 length43 ft (13.1 m)
Longest span10 ft (3 m)
Deck width101 ft (30.9 m)
Roadway width90 ft (27.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,913 (2020)
Projected traffic24,150 by 2033
Trucks5%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 SH 6 over Mustang Bayou built?

It was built in 1934, making it 91 years old in 2025. It was reconstructed in 1997.

What condition is SH 6 over Mustang Bayou 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 November 2024.

How much traffic does SH 6 over Mustang Bayou carry?

About 23,913 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is SH 6 over Mustang Bayou?

The structure is 43 ft (13.1 m) long with a longest span of 10 ft (3 m) and a deck 101 ft wide.

Who owns SH 6 over Mustang Bayou?

It is owned by the State Highway Agency.