US Bridges

Austin Avenue over North San Gabriel River

Fair

Williamson County, Texas · 2.2 MI S of IH 35 · Structure no. 142460D00025001

Built
1940
85 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
367 ft
1 main span
Daily traffic
6,405
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Austin Avenue over North San Gabriel River is a steel continuous stringer/multi-beam or girder carrying Austin Avenue over North San Gabriel River in Williamson County, Texas. It was built in 1940, so it is 85 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 6,405 vehicles a day, roughly 6% of them trucks, projected to reach 26,880 by 2030. The structure is 367 ft (111.9 m) long and 53 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesAustin Avenue
CrossesNorth San Gabriel River
Location2.2 MI S of IH 35
RouteCity Street 0
CountyWilliamson County
StateTexas
Coordinates30.64503, -97.67822
Functional classUrban Minor Arterial

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans1 (+6 approach)
Design loadH 15
Structure length367 ft (111.9 m)
Longest span85 ft (25.9 m)
Deck width53 ft (16.3 m)
Roadway width44 ft (13.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,405 (2020)
Projected traffic26,880 by 2030
Trucks6%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$40,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Austin Avenue over North San Gabriel River built?

It was built in 1940, making it 85 years old in 2025.

What condition is Austin Avenue over North San Gabriel 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 November 2023.

How much traffic does Austin Avenue over North San Gabriel River carry?

About 6,405 vehicles per day (2020 count), of which roughly 6% are trucks.

How long is Austin Avenue over North San Gabriel River?

The structure is 367 ft (111.9 m) long with a longest span of 85 ft (25.9 m) and a deck 53 ft wide.

Who owns Austin Avenue over North San Gabriel River?

It is owned by the City or Municipal Highway Agency.