US Bridges

SH 21 WB over Brazos River

Fair

Brazos County, Texas · 1.03 MI W of FM 50 · Structure no. 170210011604048

Built
1986
39 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
790 ft
4 main spans
Daily traffic
8,442
2023 count
Owner
State
State Highway Agency

About this bridge

SH 21 WB over Brazos River is a prestressed concrete stringer/multi-beam or girder carrying SH 21 WB over Brazos River in Brazos County, Texas. It was built in 1986, so it is 39 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 8,442 vehicles a day, roughly 20% of them trucks, projected to reach 8,830 by 2033. The structure is 790 ft (240.8 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSH 21 WB
CrossesBrazos River
Location1.03 MI W of FM 50
RouteState Highway 21
StateTexas
Coordinates30.62807, -96.54423
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4 (+5 approach)
Design loadHS 20
Structure length790 ft (240.8 m)
Longest span120 ft (36.6 m)
Deck width40 ft (12.2 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,442 (2023)
Projected traffic8,830 by 2033
Trucks20%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 21 WB over Brazos River built?

It was built in 1986, making it 39 years old in 2025.

What condition is SH 21 WB over Brazos River 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 SH 21 WB over Brazos River carry?

About 8,442 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is SH 21 WB over Brazos River?

The structure is 790 ft (240.8 m) long with a longest span of 120 ft (36.6 m) and a deck 40 ft wide.

Who owns SH 21 WB over Brazos River?

It is owned by the State Highway Agency.