US Bridges

IH 10 WB over San Marcos River

Fair

Caldwell County, Texas · 2.6 MI W of US 183 · Structure no. 140280053503123

Built
1969
56 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
1,760 ft
3 main spans
Daily traffic
18,426
2019 count
Owner
State
State Highway Agency

About this bridge

IH 10 WB over San Marcos River is a steel stringer/multi-beam or girder carrying IH 10 WB over San Marcos River in Caldwell 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 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 18,426 vehicles a day, roughly 38% of them trucks, projected to reach 21,755 by 2039. The structure is 1,760 ft (536.4 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesIH 10 WB
CrossesSan Marcos River
Location2.6 MI W of US 183
RouteInterstate 10
StateTexas
Coordinates29.64944, -97.63368
Functional classRural Principal Arterial - Interstate

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55 US tons
Inventory rating29 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3 (+23 approach)
Design loadHS 20
Structure length1,760 ft (536.4 m)
Longest span110 ft (33.5 m)
Deck width42 ft (12.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,426 (2019)
Projected traffic21,755 by 2039
Trucks38%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 IH 10 WB over San Marcos River built?

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

What condition is IH 10 WB over San Marcos 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 December 2024.

How much traffic does IH 10 WB over San Marcos River carry?

About 18,426 vehicles per day (2019 count), of which roughly 38% are trucks.

How long is IH 10 WB over San Marcos River?

The structure is 1,760 ft (536.4 m) long with a longest span of 110 ft (33.5 m) and a deck 42 ft wide.

Who owns IH 10 WB over San Marcos River?

It is owned by the State Highway Agency.