US Bridges

Lp 1604 over San Antonio River

Good

Bexar County, Texas · 4.5 MI SW of US 181 · Structure no. 150150225502010

Built
1969
56 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
825 ft
1 main span
Daily traffic
4,684
2023 count
Owner
State
State Highway Agency

About this bridge

Lp 1604 over San Antonio River is a prestressed concrete stringer/multi-beam or girder carrying Lp 1604 over San Antonio River in Bexar County, Texas. It was built in 1969, so it is 56 years old, older than the Texas average of 44.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,684 vehicles a day, roughly 15% of them trucks, projected to reach 5,310 by 2033. The structure is 825 ft (251.5 m) long and 42 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

CarriesLp 1604
CrossesSan Antonio River
Location4.5 MI SW of US 181
RouteState Highway 1604
StateTexas
Coordinates29.2222, -98.35602
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1 (+11 approach)
Design loadHS 20
Structure length825 ft (251.5 m)
Longest span105 ft (32 m)
Deck width42 ft (12.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,684 (2023)
Projected traffic5,310 by 2033
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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 Lp 1604 over San Antonio River built?

It was built in 1969, making it 56 years old in 2025.

What condition is Lp 1604 over San Antonio River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2024.

How much traffic does Lp 1604 over San Antonio River carry?

About 4,684 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is Lp 1604 over San Antonio River?

The structure is 825 ft (251.5 m) long with a longest span of 105 ft (32 m) and a deck 42 ft wide.

Who owns Lp 1604 over San Antonio River?

It is owned by the State Highway Agency.