US Bridges

SH 29 over San Gabriel River

Fair

Williamson County, Texas · 6.30 MI E of IH 35 · Structure no. 142460033702023

Built
1959
66 years old, rebuilt 1993
Condition
Fair
inspected January 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
590 ft
3 main spans
Daily traffic
8,048
2019 count
Owner
State
State Highway Agency

About this bridge

SH 29 over San Gabriel River is a steel continuous stringer/multi-beam or girder carrying SH 29 over San Gabriel River in Williamson County, Texas. It was built in 1959 and reconstructed in 1993, so it is 66 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 5 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 8,048 vehicles a day, roughly 5% of them trucks, projected to reach 10,462 by 2039. The structure is 590 ft (179.8 m) long and 46 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesSH 29
CrossesSan Gabriel River
Location6.30 MI E of IH 35
RouteState Highway 29
CountyWilliamson County
StateTexas
Coordinates30.64606, -97.58536
Functional classRural 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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating29 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+8 approach)
Design loadH 20
Structure length590 ft (179.8 m)
Longest span90 ft (27.4 m)
Deck width46 ft (14 m)
Roadway width43 ft (13.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,048 (2019)
Projected traffic10,462 by 2039
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 29 over San Gabriel River built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1993.

What condition is SH 29 over 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 January 2023.

How much traffic does SH 29 over San Gabriel River carry?

About 8,048 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is SH 29 over San Gabriel River?

The structure is 590 ft (179.8 m) long with a longest span of 90 ft (27.4 m) and a deck 46 ft wide.

Who owns SH 29 over San Gabriel River?

It is owned by the State Highway Agency.