US Bridges

County Road B over Rio Costilla

Fair

Costilla County, Colorado · Just E of CR 13 · Structure no. CSGAR-W0.8S159A

Built
1985
40 years old
Condition
Fair
inspected March 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
37 ft
2 main spans
Daily traffic
81
2022 count
Owner
County
County Highway Agency

About this bridge

County Road B over Rio Costilla is a steel continuous stringer/multi-beam or girder carrying County Road B over Rio Costilla in Costilla County, Colorado. It was built in 1985, so it is 40 years old, younger than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 81 vehicles a day, projected to reach 90 by 2042. The structure is 37 ft (11.2 m) long and 28 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesCounty Road B
CrossesRio Costilla
LocationJust E of CR 13
RouteCounty Highway 0
CountyCostilla County
StateColorado
Coordinates37.00768, -105.53552
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating40.8 US tons
Inventory rating24.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckCorrugated steel
Main spans2
Design loadUnknown
Structure length37 ft (11.2 m)
Longest span13 ft (3.9 m)
Deck width28 ft (8.6 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic81 (2022)
Projected traffic90 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 County Road B over Rio Costilla built?

It was built in 1985, making it 40 years old in 2025.

What condition is County Road B over Rio Costilla 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 March 2025.

How much traffic does County Road B over Rio Costilla carry?

About 81 vehicles per day (2022 count).

How long is County Road B over Rio Costilla?

The structure is 37 ft (11.2 m) long with a longest span of 13 ft (3.9 m) and a deck 28 ft wide.

Who owns County Road B over Rio Costilla?

It is owned by the County Highway Agency.