US Bridges

SH 21 over Carrizo Creek

Fair

San Augustine County, Texas · 0.50 MI E of SH 147 · Structure no. 112030006404048

Built
1942
83 years old
Condition
Fair
inspected May 2024
Type
Culvert
Concrete
Length
34 ft
3 main spans
Daily traffic
1,917
2020 count
Owner
State
State Highway Agency

About this bridge

SH 21 over Carrizo Creek is a concrete culvert carrying SH 21 over Carrizo Creek in San Augustine County, Texas. It was built in 1942, so it is 83 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 1,917 vehicles a day, roughly 15% of them trucks, projected to reach 2,722 by 2040. The structure is 34 ft (10.4 m) long and 45 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesSH 21
CrossesCarrizo Creek
Location0.50 MI E of SH 147
RouteState Highway 21
CountySan Augustine County
StateTexas
Coordinates31.52684, -94.09241
Functional classRural 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
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
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 spans3
Design loadH 15
Structure length34 ft (10.4 m)
Longest span10 ft (3 m)
Deck width45 ft (13.7 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,917 (2020)
Projected traffic2,722 by 2040
Trucks15%
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 SH 21 over Carrizo Creek built?

It was built in 1942, making it 83 years old in 2025.

What condition is SH 21 over Carrizo 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 May 2024.

How much traffic does SH 21 over Carrizo Creek carry?

About 1,917 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is SH 21 over Carrizo Creek?

The structure is 34 ft (10.4 m) long with a longest span of 10 ft (3 m) and a deck 45 ft wide.

Who owns SH 21 over Carrizo Creek?

It is owned by the State Highway Agency.