US Bridges

US 90 over San Marcos River Relief

Fair

Caldwell County, Texas · 3.2 MI W of US 183 · Structure no. 140280002903010

Built
1935
90 years old, rebuilt 1989
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
780 ft
15 main spans
Daily traffic
2,250
2023 count
Owner
State
State Highway Agency

About this bridge

US 90 over San Marcos River Relief is a steel stringer/multi-beam or girder carrying US 90 over San Marcos River Relief in Caldwell County, Texas. It was built in 1935 and reconstructed in 1989, so it is 90 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 2,250 vehicles a day, roughly 8% of them trucks, projected to reach 3,150 by 2042. The structure is 780 ft (237.7 m) long and 52 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesUS 90
CrossesSan Marcos River Relief
Location3.2 MI W of US 183
RouteU.S. Route 90
StateTexas
Coordinates29.67001, -97.69854
Functional classRural Principal Arterial - Other

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 protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43 US tons
Inventory rating26 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans15
Design loadUnknown
Structure length780 ft (237.7 m)
Longest span52 ft (15.9 m)
Deck width52 ft (15.9 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,250 (2023)
Projected traffic3,150 by 2042
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed3.7 mi (6 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 US 90 over San Marcos River Relief built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 1989.

What condition is US 90 over San Marcos River Relief 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 October 2024.

How much traffic does US 90 over San Marcos River Relief carry?

About 2,250 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is US 90 over San Marcos River Relief?

The structure is 780 ft (237.7 m) long with a longest span of 52 ft (15.9 m) and a deck 52 ft wide.

Who owns US 90 over San Marcos River Relief?

It is owned by the State Highway Agency.