US Bridges

County Road 31 over I 70 Ml

Good

Lincoln County, Colorado · Genoa Exit · Structure no. G-23-AD

Built
1975
50 years old
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
284 ft
2 main spans
Daily traffic
546
2024 count
Owner
State
State Highway Agency

About this bridge

County Road 31 over I 70 Ml is a steel continuous stringer/multi-beam or girder carrying County Road 31 over I 70 Ml in Lincoln 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 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 546 vehicles a day, projected to reach 693 by 2044. The structure is 284 ft (86.6 m) long and 36 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesCounty Road 31
CrossesI 70 Ml
LocationGenoa Exit
RouteCounty Highway 0
Coordinates39.27457, -103.49125
Functional classRural Major Collector

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.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.1 US tons
Inventory rating37.1 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length284 ft (86.6 m)
Longest span140 ft (42.7 m)
Deck width36 ft (11.1 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic546 (2024)
Projected traffic693 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
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 31 over I 70 Ml built?

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

What condition is County Road 31 over I 70 Ml 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 November 2023.

How much traffic does County Road 31 over I 70 Ml carry?

About 546 vehicles per day (2024 count).

How long is County Road 31 over I 70 Ml?

The structure is 284 ft (86.6 m) long with a longest span of 140 ft (42.7 m) and a deck 36 ft wide.

Who owns County Road 31 over I 70 Ml?

It is owned by the State Highway Agency.