US Bridges

SP 421-CULEBRA over IH 10 Lower Level

Fair

Bexar County, Texas · 0.30 MI S of Cincinnati · Structure no. 150150007212185

Built
1948
77 years old
Condition
Fair
inspected July 2024
Type
Tee Beam
Concrete Continuous
Length
185 ft
5 main spans
Daily traffic
35,392
2023 count
Owner
State
State Highway Agency

About this bridge

SP 421-CULEBRA over IH 10 Lower Level is a concrete continuous tee beam carrying SP 421-CULEBRA over IH 10 Lower Level in Bexar County, Texas. It was built in 1948, so it is 77 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 35,392 vehicles a day, roughly 3% of them trucks, projected to reach 49,549 by 2042. The structure is 185 ft (56.4 m) long and 64 ft wide.

Location

Open in Google Maps
CarriesSP 421-CULEBRA
CrossesIH 10 Lower Level
Location0.30 MI S of Cincinnati
RouteState Highway 421
CountyBexar County
StateTexas
Coordinates29.44403, -98.51487
Functional classUrban Other Principal 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating30 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadH 20
Structure length185 ft (56.4 m)
Longest span44 ft (13.4 m)
Deck width64 ft (19.5 m)
Roadway width50 ft (15.3 m)
Vertical clearance over deck15 ft (4.5 m)

Traffic and service

Average daily traffic35,392 (2023)
Projected traffic49,549 by 2042
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$24,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was SP 421-CULEBRA over IH 10 Lower Level built?

It was built in 1948, making it 77 years old in 2025.

What condition is SP 421-CULEBRA over IH 10 Lower Level 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 July 2024.

How much traffic does SP 421-CULEBRA over IH 10 Lower Level carry?

About 35,392 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is SP 421-CULEBRA over IH 10 Lower Level?

The structure is 185 ft (56.4 m) long with a longest span of 44 ft (13.4 m) and a deck 64 ft wide.

Who owns SP 421-CULEBRA over IH 10 Lower Level?

It is owned by the State Highway Agency.