US Bridges

Old San Antonio RD over Onion Creek Trib

Fair

Travis County, Texas · 0.10 MI N of Hays CO LN · Structure no. 142270AA0103003

Built
1928
97 years old, rebuilt 1987
Condition
Fair
inspected March 2024
Type
Culvert
Concrete
Length
24 ft
2 main spans
Daily traffic
2,781
2020 count
Owner
County
County Highway Agency

About this bridge

Old San Antonio RD over Onion Creek Trib is a concrete culvert carrying Old San Antonio RD over Onion Creek Trib in Travis County, Texas. It was built in 1928 and reconstructed in 1987, so it is 97 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 2,781 vehicles a day, projected to reach 4,087 by 2027. The structure is 24 ft (7.2 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesOld San Antonio RD
CrossesOnion Creek Trib
Location0.10 MI N of Hays CO LN
RouteCounty Highway 0
CountyTravis County
StateTexas
Coordinates30.1019, -97.81457
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length24 ft (7.2 m)
Longest span10 ft (3 m)
Deck width28 ft (8.6 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,781 (2020)
Projected traffic4,087 by 2027
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$39,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Old San Antonio RD over Onion Creek Trib built?

It was built in 1928, making it 97 years old in 2025. It was reconstructed in 1987.

What condition is Old San Antonio RD over Onion Creek Trib 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 March 2024.

How much traffic does Old San Antonio RD over Onion Creek Trib carry?

About 2,781 vehicles per day (2020 count).

How long is Old San Antonio RD over Onion Creek Trib?

The structure is 24 ft (7.2 m) long with a longest span of 10 ft (3 m) and a deck 28 ft wide.

Who owns Old San Antonio RD over Onion Creek Trib?

It is owned by the County Highway Agency.