US Bridges

SH 21 over Larrison Creek Relief

Fair

Madison County, Texas · 2.7 MI NE of FM 1428 · Structure no. 171540011705031

Built
1927
98 years old, rebuilt 1968
Condition
Fair
inspected June 2023
Type
Culvert
Concrete
Length
34 ft
4 main spans
Daily traffic
4,991
2020 count
Owner
State
State Highway Agency

About this bridge

SH 21 over Larrison Creek Relief is a concrete culvert carrying SH 21 over Larrison Creek Relief in Madison County, Texas. It was built in 1927 and reconstructed in 1968, so it is 98 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 4,991 vehicles a day, roughly 15% of them trucks, projected to reach 7,184 by 2039. The structure is 34 ft (10.4 m) long and 49 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesSH 21
CrossesLarrison Creek Relief
Location2.7 MI NE of FM 1428
RouteState Highway 21
CountyMadison County
StateTexas
Coordinates30.99706, -95.79995
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable 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 spans4
Design loadH 15
Structure length34 ft (10.4 m)
Longest span8 ft (2.4 m)
Deck width49 ft (14.9 m)
Roadway width45 ft (13.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,991 (2020)
Projected traffic7,184 by 2039
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemYes

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 Larrison Creek Relief built?

It was built in 1927, making it 98 years old in 2025. It was reconstructed in 1968.

What condition is SH 21 over Larrison Creek Relief 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 June 2023.

How much traffic does SH 21 over Larrison Creek Relief carry?

About 4,991 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is SH 21 over Larrison Creek Relief?

The structure is 34 ft (10.4 m) long with a longest span of 8 ft (2.4 m) and a deck 49 ft wide.

Who owns SH 21 over Larrison Creek Relief?

It is owned by the State Highway Agency.