US Bridges

SH 21 over Cottonwood Creek

Fair

Bastrop County, Texas · 8.4 MI E of FM 812 · Structure no. 140110047105079

Built
1982
43 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
85 ft
2 main spans
Daily traffic
18,732
2023 count
Owner
State
State Highway Agency

About this bridge

SH 21 over Cottonwood Creek is a concrete stringer/multi-beam or girder carrying SH 21 over Cottonwood Creek in Bastrop County, Texas. It was built in 1982, so it is 43 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 18,732 vehicles a day, roughly 12% of them trucks, projected to reach 33,343 by 2042. The structure is 85 ft (25.9 m) long and 56 ft wide. If it were closed, the detour would be 21.1 mi (34 km).

CarriesSH 21
CrossesCottonwood Creek
Location8.4 MI E of FM 812
RouteState Highway 21
StateTexas
Coordinates30.1075, -97.44234
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75 US tons
Inventory rating45 US tons

Structure

MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length85 ft (25.9 m)
Longest span42 ft (12.8 m)
Deck width56 ft (17.1 m)
Roadway width54 ft (16.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,732 (2023)
Projected traffic33,343 by 2042
Trucks12%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.1 mi (34 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 over Cottonwood Creek built?

It was built in 1982, making it 43 years old in 2025.

What condition is SH 21 over Cottonwood 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 November 2024.

How much traffic does SH 21 over Cottonwood Creek carry?

About 18,732 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is SH 21 over Cottonwood Creek?

The structure is 85 ft (25.9 m) long with a longest span of 42 ft (12.8 m) and a deck 56 ft wide.

Who owns SH 21 over Cottonwood Creek?

It is owned by the State Highway Agency.