US Bridges

County Road 12 over Arkansas River

Fair

Fremont County, Colorado · At Cotopaxi · Structure no. FRCO 12-306A

Built
1984
41 years old
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
96 ft
1 main span
Daily traffic
643
2022 count
Owner
County
County Highway Agency

About this bridge

County Road 12 over Arkansas River is a steel stringer/multi-beam or girder carrying County Road 12 over Arkansas River in Fremont County, Colorado. It was built in 1984, so it is 41 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 643 vehicles a day, roughly 2% of them trucks, projected to reach 720 by 2042. The structure is 96 ft (29.3 m) long and 32 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesCounty Road 12
CrossesArkansas River
LocationAt Cotopaxi
RouteCounty Highway 0
CountyFremont County
StateColorado
Coordinates38.37123, -105.68889
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating58.1 US tons
Inventory rating34.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length96 ft (29.3 m)
Longest span91 ft (27.7 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic643 (2022)
Projected traffic720 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.5 million
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 12 over Arkansas River built?

It was built in 1984, making it 41 years old in 2025.

What condition is County Road 12 over Arkansas 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 February 2025.

How much traffic does County Road 12 over Arkansas River carry?

About 643 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is County Road 12 over Arkansas River?

The structure is 96 ft (29.3 m) long with a longest span of 91 ft (27.7 m) and a deck 32 ft wide.

Who owns County Road 12 over Arkansas River?

It is owned by the County Highway Agency.