US Bridges

I 70 Ml over County Road

Good

Summit County, Colorado · 2.1 MI E of JCT SH91 · Structure no. F-12-AA

Built
1977
48 years old
Condition
Good
inspected April 2023
Type
Tee Beam
Concrete Continuous
Length
131 ft
3 main spans
Daily traffic
27,000
2020 count
Owner
State
State Highway Agency

About this bridge

I 70 Ml over County Road is a concrete continuous tee beam carrying I 70 Ml over County Road in Summit County, Colorado. It was built in 1977, so it is 48 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 27,000 vehicles a day, roughly 11% of them trucks, projected to reach 34,020 by 2040. The structure is 131 ft (39.9 m) long and 111 ft wide.

CarriesI 70 Ml
CrossesCounty Road
Location2.1 MI E of JCT SH91
RouteInterstate 70A
Coordinates39.53744, -106.14289
Functional classRural Principal Arterial - Interstate

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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.5 US tons
Inventory rating46.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length131 ft (39.9 m)
Longest span49 ft (15 m)
Deck width111 ft (33.8 m)
Roadway width108 ft (32.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,000 (2020)
Projected traffic34,020 by 2040
Trucks11%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I 70 Ml over County Road built?

It was built in 1977, making it 48 years old in 2025.

What condition is I 70 Ml over County Road 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 April 2023.

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

About 27,000 vehicles per day (2020 count), of which roughly 11% are trucks.

How long is I 70 Ml over County Road?

The structure is 131 ft (39.9 m) long with a longest span of 49 ft (15 m) and a deck 111 ft wide.

Who owns I 70 Ml over County Road?

It is owned by the State Highway Agency.