US Bridges

SH 80 over San Antonio River

Fair

Karnes County, Texas · 1.3 MI SW of FM 81 · Structure no. 161290034804011

Built
1930
95 years old, rebuilt 1971
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
493 ft
2 main spans
Daily traffic
3,775
2022 count
Owner
State
State Highway Agency

About this bridge

SH 80 over San Antonio River is a prestressed concrete stringer/multi-beam or girder carrying SH 80 over San Antonio River in Karnes County, Texas. It was built in 1930 and reconstructed in 1971, so it is 95 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 3,775 vehicles a day, roughly 40% of them trucks, projected to reach 5,285 by 2042. The structure is 493 ft (150.3 m) long and 51 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesSH 80
CrossesSan Antonio River
Location1.3 MI SW of FM 81
RouteState Highway 80
CountyKarnes County
StateTexas
Coordinates28.93822, -97.83427
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating45 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2 (+12 approach)
Design loadUnknown
Structure length493 ft (150.3 m)
Longest span76 ft (23.2 m)
Deck width51 ft (15.4 m)
Roadway width48 ft (14.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,775 (2022)
Projected traffic5,285 by 2042
Trucks40%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1971.

What condition is SH 80 over San Antonio 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 April 2024.

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

About 3,775 vehicles per day (2022 count), of which roughly 40% are trucks.

How long is SH 80 over San Antonio River?

The structure is 493 ft (150.3 m) long with a longest span of 76 ft (23.2 m) and a deck 51 ft wide.

Who owns SH 80 over San Antonio River?

It is owned by the State Highway Agency.