US Bridges

S 1st ST over Lady Bird Lake

Fair

Travis County, Texas · 0.1 MI S of Cesar Chavez · Structure no. 142270B00003017

Built
1951
74 years old, rebuilt 1992
Condition
Fair
inspected May 2024
Type
Girder and Floorbeam System
Steel Continuous
Length
812 ft
6 main spans
Daily traffic
12,497
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

S 1st ST over Lady Bird Lake is a steel continuous girder and floorbeam system carrying S 1st ST over Lady Bird Lake in Travis County, Texas. It was built in 1951 and reconstructed in 1992, so it is 74 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 12,497 vehicles a day, projected to reach 30,000 by 2034. The structure is 812 ft (247.5 m) long and 101 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesS 1st ST
CrossesLady Bird Lake
Location0.1 MI S of Cesar Chavez
RouteCity Street 0
CountyTravis County
StateTexas
Coordinates30.26289, -97.74796
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
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 rating36 US tons
Inventory rating27 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans6 (+1 approach)
Design loadUnknown
Structure length812 ft (247.5 m)
Longest span150 ft (45.7 m)
Deck width101 ft (30.8 m)
Roadway width77 ft (23.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,497 (2020)
Projected traffic30,000 by 2034
Trucks0%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 S 1st ST over Lady Bird Lake built?

It was built in 1951, making it 74 years old in 2025. It was reconstructed in 1992.

What condition is S 1st ST over Lady Bird Lake 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 S 1st ST over Lady Bird Lake carry?

About 12,497 vehicles per day (2020 count).

How long is S 1st ST over Lady Bird Lake?

The structure is 812 ft (247.5 m) long with a longest span of 150 ft (45.7 m) and a deck 101 ft wide.

Who owns S 1st ST over Lady Bird Lake?

It is owned by the City or Municipal Highway Agency.