US Bridges

County Road 12 over I 70 Ml

Fair

Kit Carson County, Colorado · 7.2 MI E. of Flagler · Structure no. G-25-O

Built
1975
50 years old
Condition
Fair
inspected November 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
233 ft
2 main spans
Daily traffic
15
2022 count
Owner
State
State Highway Agency

About this bridge

County Road 12 over I 70 Ml is a concrete continuous box beam or girders - multiple carrying County Road 12 over I 70 Ml in Kit Carson County, Colorado. It was built in 1975, so it is 50 years old, older 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 15 vehicles a day, projected to reach 18 by 2042. The structure is 233 ft (71 m) long and 36 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesCounty Road 12
CrossesI 70 Ml
Location7.2 MI E. of Flagler
RouteCounty Highway 70A
CountyKit Carson County
StateColorado
Coordinates39.28365, -102.93178
Functional classRural Principal Arterial - Interstate

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.2 US tons
Inventory rating17.9 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length233 ft (71 m)
Longest span115 ft (35.1 m)
Deck width36 ft (11.1 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2022)
Projected traffic18 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

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 County Road 12 over I 70 Ml built?

It was built in 1975, making it 50 years old in 2025.

What condition is County Road 12 over I 70 Ml 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 November 2023.

How much traffic does County Road 12 over I 70 Ml carry?

About 15 vehicles per day (2022 count).

How long is County Road 12 over I 70 Ml?

The structure is 233 ft (71 m) long with a longest span of 115 ft (35.1 m) and a deck 36 ft wide.

Who owns County Road 12 over I 70 Ml?

It is owned by the State Highway Agency.