US Bridges

SP 421 over Apache Creek

Fair

Bexar County, Texas · 1.76 MI SE of IH 410 · Structure no. 150150029110062

Built
1930
95 years old, rebuilt 2010
Condition
Fair
inspected June 2024
Type
Culvert
Concrete
Length
22 ft
2 main spans
Daily traffic
23,916
2020 count
Owner
State
State Highway Agency

About this bridge

SP 421 over Apache Creek is a concrete culvert carrying SP 421 over Apache Creek in Bexar County, Texas. It was built in 1930 and reconstructed in 2010, so it is 95 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 23,916 vehicles a day, roughly 12% of them trucks, projected to reach 35,120 by 2033. The structure is 22 ft (6.7 m) long and 94 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSP 421
CrossesApache Creek
Location1.76 MI SE of IH 410
RouteState Highway 421
CountyBexar County
StateTexas
Coordinates29.47091, -98.57362
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating26 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 15
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width94 ft (28.7 m)
Roadway width83 ft (25.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,916 (2020)
Projected traffic35,120 by 2033
Trucks12%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was SP 421 over Apache Creek built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 2010.

What condition is SP 421 over Apache Creek 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 June 2024.

How much traffic does SP 421 over Apache Creek carry?

About 23,916 vehicles per day (2020 count), of which roughly 12% are trucks.

How long is SP 421 over Apache Creek?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m) and a deck 94 ft wide.

Who owns SP 421 over Apache Creek?

It is owned by the State Highway Agency.