US Bridges

I 70 Ml over County Road

Fair

Clear Creek County, Colorado · 1 MI W of Silverplume · Structure no. F-13-S

Built
1968
57 years old, rebuilt 1984
Condition
Fair
inspected April 2023
Type
Tee Beam
Concrete Continuous
Length
180 ft
3 main spans
Daily traffic
33,000
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 Clear Creek County, Colorado. It was built in 1968 and reconstructed in 1984, so it is 57 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 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 33,000 vehicles a day, roughly 9% of them trucks, projected to reach 41,580 by 2040. The structure is 180 ft (54.9 m) long and 92 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesI 70 Ml
CrossesCounty Road
Location1 MI W of Silverplume
RouteInterstate 70A
Coordinates39.69585, -105.7411
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.4 US tons
Inventory rating23.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length180 ft (54.9 m)
Longest span70 ft (21.3 m)
Deck width92 ft (27.9 m)
Roadway width87 ft (26.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33,000 (2020)
Projected traffic41,580 by 2040
Trucks9%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 km)
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 1968, making it 57 years old in 2025. It was reconstructed in 1984.

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

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

About 33,000 vehicles per day (2020 count), of which roughly 9% are trucks.

How long is I 70 Ml over County Road?

The structure is 180 ft (54.9 m) long with a longest span of 70 ft (21.3 m) and a deck 92 ft wide.

Who owns I 70 Ml over County Road?

It is owned by the State Highway Agency.