US Bridges

Lp 1 NB over Barton Springs/A. Zilker

Fair

Travis County, Texas · 2.30 MI NE of Lp 360 · Structure no. 142270313601014

Built
1973
52 years old
Condition
Fair
inspected August 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
1,051 ft
7 main spans
Daily traffic
90,915
2019 count
Owner
State
State Highway Agency

About this bridge

Lp 1 NB over Barton Springs/A. Zilker is a prestressed concrete stringer/multi-beam or girder carrying Lp 1 NB over Barton Springs/A. Zilker in Travis County, Texas. It was built in 1973, so it is 52 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 90,915 vehicles a day, roughly 2% of them trucks, projected to reach 85,890 by 2036. The structure is 1,051 ft (320.3 m) long and 56 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesLp 1 NB
CrossesBarton Springs/A. Zilker
Location2.30 MI NE of Lp 360
RouteState Highway 1
CountyTravis County
StateTexas
Coordinates30.2693, -97.77601
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Last inspectionAugust 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans7 (+5 approach)
Design loadHS 20
Structure length1,051 ft (320.3 m)
Longest span120 ft (36.6 m)
Deck width56 ft (17 m)
Roadway width54 ft (16.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic90,915 (2019)
Projected traffic85,890 by 2036
Trucks2%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Lp 1 NB over Barton Springs/A. Zilker built?

It was built in 1973, making it 52 years old in 2025.

What condition is Lp 1 NB over Barton Springs/A. Zilker 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 August 2022.

How much traffic does Lp 1 NB over Barton Springs/A. Zilker carry?

About 90,915 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is Lp 1 NB over Barton Springs/A. Zilker?

The structure is 1,051 ft (320.3 m) long with a longest span of 120 ft (36.6 m) and a deck 56 ft wide.

Who owns Lp 1 NB over Barton Springs/A. Zilker?

It is owned by the State Highway Agency.