US Bridges

County Road 31 over Arikaree River

Fair

Lincoln County, Colorado · 0.8 Mile North of Road 3V · Structure no. LIN-31-3V.8A

Built
1992
33 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
142 ft
2 main spans
Daily traffic
90
2020 count
Owner
County
County Highway Agency

About this bridge

County Road 31 over Arikaree River is a steel continuous stringer/multi-beam or girder carrying County Road 31 over Arikaree River in Lincoln County, Colorado. It was built in 1992, so it is 33 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 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 90 vehicles a day, projected to reach 114 by 2040. The structure is 142 ft (43.3 m) long and 32 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesCounty Road 31
CrossesArikaree River
Location0.8 Mile North of Road 3V
RouteCounty Highway 0
CountyLincoln County
StateColorado
Coordinates39.45854, -103.49143
Functional classRural Major 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
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 geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36.2 US tons
Inventory rating21.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckCorrugated steel
Main spans2
Design loadUnknown
Structure length142 ft (43.3 m)
Longest span68 ft (20.7 m)
Deck width32 ft (9.9 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic90 (2020)
Projected traffic114 by 2040
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 31 over Arikaree River built?

It was built in 1992, making it 33 years old in 2025.

What condition is County Road 31 over Arikaree 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 May 2023.

How much traffic does County Road 31 over Arikaree River carry?

About 90 vehicles per day (2020 count).

How long is County Road 31 over Arikaree River?

The structure is 142 ft (43.3 m) long with a longest span of 68 ft (20.7 m) and a deck 32 ft wide.

Who owns County Road 31 over Arikaree River?

It is owned by the County Highway Agency.