US Bridges

SH 80 over San Antonio River Relief

Fair

Karnes County, Texas · 0.9 MI SW of FM 81 · Structure no. 161290034804018

Built
1949
76 years old, rebuilt 1971
Condition
Fair
inspected April 2024
Type
Slab
Concrete Continuous
Length
160 ft
6 main spans
Daily traffic
4,292
2024 count
Owner
State
State Highway Agency

About this bridge

SH 80 over San Antonio River Relief is a concrete continuous slab carrying SH 80 over San Antonio River Relief in Karnes County, Texas. It was built in 1949 and reconstructed in 1971, so it is 76 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 4,292 vehicles a day, roughly 24% of them trucks, projected to reach 9,580 by 2033. The structure is 160 ft (48.8 m) long and 50 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

CarriesSH 80
CrossesSan Antonio River Relief
Location0.9 MI SW of FM 81
RouteState Highway 80
StateTexas
Coordinates28.94209, -97.83159
Functional classRural Major Collector

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
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 rating42 US tons
Inventory rating25 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadOther
Structure length160 ft (48.8 m)
Longest span30 ft (9.1 m)
Deck width50 ft (15.2 m)
Roadway width47 ft (14.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,292 (2024)
Projected traffic9,580 by 2033
Trucks24%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed14.3 mi (23 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 80 over San Antonio River Relief built?

It was built in 1949, making it 76 years old in 2025. It was reconstructed in 1971.

What condition is SH 80 over San Antonio River 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 April 2024.

How much traffic does SH 80 over San Antonio River Relief carry?

About 4,292 vehicles per day (2024 count), of which roughly 24% are trucks.

How long is SH 80 over San Antonio River Relief?

The structure is 160 ft (48.8 m) long with a longest span of 30 ft (9.1 m) and a deck 50 ft wide.

Who owns SH 80 over San Antonio River Relief?

It is owned by the State Highway Agency.