US Bridges

SP 400 over Chacon Creek

Good

Webb County, Texas · 0.40 MI W of Lp 20 · Structure no. 222400354301001

Built
1996
29 years old
Condition
Good
inspected December 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
270 ft
4 main spans
Daily traffic
20,937
2023 count
Owner
State
State Highway Agency

About this bridge

SP 400 over Chacon Creek is a prestressed concrete stringer/multi-beam or girder carrying SP 400 over Chacon Creek in Webb County, Texas. It was built in 1996, so it is 29 years old, younger 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 20,937 vehicles a day, roughly 9% of them trucks, projected to reach 24,110 by 2033. The structure is 270 ft (82.3 m) long and 86 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSP 400
CrossesChacon Creek
Location0.40 MI W of Lp 20
RouteState Highway 400
CountyWebb County
StateTexas
Coordinates27.5168, -99.4561
Functional classUrban Other Principal 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 inspectionDecember 2022
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length270 ft (82.3 m)
Longest span68 ft (20.7 m)
Deck width86 ft (26.2 m)
Roadway width60 ft (18.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,937 (2023)
Projected traffic24,110 by 2033
Trucks9%
Lanes on structure4
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 statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SP 400 over Chacon Creek built?

It was built in 1996, making it 29 years old in 2025.

What condition is SP 400 over Chacon Creek 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 December 2022.

How much traffic does SP 400 over Chacon Creek carry?

About 20,937 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is SP 400 over Chacon Creek?

The structure is 270 ft (82.3 m) long with a longest span of 68 ft (20.7 m) and a deck 86 ft wide.

Who owns SP 400 over Chacon Creek?

It is owned by the State Highway Agency.