US Bridges

SH 123 over San Antonio River

Fair

Karnes County, Texas · 3.6 MI N of SH 80 · Structure no. 161290036606030

Built
1939
86 years old, rebuilt 1991
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
399 ft
3 main spans
Daily traffic
3,174
2020 count
Owner
State
State Highway Agency

About this bridge

SH 123 over San Antonio River is a prestressed concrete stringer/multi-beam or girder carrying SH 123 over San Antonio River in Karnes County, Texas. It was built in 1939 and reconstructed in 1991, so it is 86 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 3,174 vehicles a day, roughly 17% of them trucks, projected to reach 6,730 by 2033. The structure is 399 ft (121.6 m) long and 70 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesSH 123
CrossesSan Antonio River
Location3.6 MI N of SH 80
RouteState Highway 123
CountyKarnes County
StateTexas
Coordinates28.94215, -97.90461
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating33 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3 (+4 approach)
Design loadH 15
Structure length399 ft (121.6 m)
Longest span90 ft (27.4 m)
Deck width70 ft (21.3 m)
Roadway width67 ft (20.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,174 (2020)
Projected traffic6,730 by 2033
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$1.8 million
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 123 over San Antonio River built?

It was built in 1939, making it 86 years old in 2025. It was reconstructed in 1991.

What condition is SH 123 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 May 2024.

How much traffic does SH 123 over San Antonio River carry?

About 3,174 vehicles per day (2020 count), of which roughly 17% are trucks.

How long is SH 123 over San Antonio River?

The structure is 399 ft (121.6 m) long with a longest span of 90 ft (27.4 m) and a deck 70 ft wide.

Who owns SH 123 over San Antonio River?

It is owned by the State Highway Agency.