US Bridges

US 281 SB over San Antonio River

Good

Bexar County, Texas · 0.65 MI NW of IH 35 · Structure no. 150150007308122

Built
1976
49 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
180 ft
3 main spans
Daily traffic
65,531
2023 count
Owner
State
State Highway Agency

About this bridge

US 281 SB over San Antonio River is a prestressed concrete stringer/multi-beam or girder carrying US 281 SB over San Antonio River in Bexar County, Texas. It was built in 1976, so it is 49 years old, older than the Texas average of 44.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 65,531 vehicles a day, roughly 3% of them trucks, projected to reach 91,744 by 2042. The structure is 180 ft (54.9 m) long and 70 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesUS 281 SB
CrossesSan Antonio River
Location0.65 MI NW of IH 35
RouteU.S. Route 281
StateTexas
Coordinates29.44735, -98.48068
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length180 ft (54.9 m)
Longest span70 ft (21.3 m)
Deck width70 ft (21.3 m)
Roadway width69 ft (21 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic65,531 (2023)
Projected traffic91,744 by 2042
Trucks3%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 US 281 SB over San Antonio River built?

It was built in 1976, making it 49 years old in 2025.

What condition is US 281 SB over San Antonio River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2024.

How much traffic does US 281 SB over San Antonio River carry?

About 65,531 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is US 281 SB over San Antonio River?

The structure is 180 ft (54.9 m) long with a longest span of 70 ft (21.3 m) and a deck 70 ft wide.

Who owns US 281 SB over San Antonio River?

It is owned by the State Highway Agency.