US Bridges

County Road 4 over I 76 Ml

Fair

Morgan County, Colorado · Near Wiggins · Structure no. D-20-AG

Built
1959
66 years old
Condition
Fair
inspected February 2025
Type
Tee Beam
Concrete Continuous
Length
265 ft
4 main spans
Daily traffic
459
2023 count
Owner
State
State Highway Agency

About this bridge

County Road 4 over I 76 Ml is a concrete continuous tee beam carrying County Road 4 over I 76 Ml in Morgan County, Colorado. It was built in 1959, so it is 66 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 459 vehicles a day, roughly 10% of them trucks, projected to reach 582 by 2042. The structure is 265 ft (80.8 m) long and 28 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesCounty Road 4
CrossesI 76 Ml
LocationNear Wiggins
RouteCounty Highway 0
Coordinates40.23823, -104.07462
Functional classRural Minor Arterial

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 inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.5 US tons
Inventory rating44.6 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length265 ft (80.8 m)
Longest span76 ft (23.2 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic459 (2023)
Projected traffic582 by 2042
Trucks10%
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 4 over I 76 Ml built?

It was built in 1959, making it 66 years old in 2025.

What condition is County Road 4 over I 76 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 February 2025.

How much traffic does County Road 4 over I 76 Ml carry?

About 459 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is County Road 4 over I 76 Ml?

The structure is 265 ft (80.8 m) long with a longest span of 76 ft (23.2 m) and a deck 28 ft wide.

Who owns County Road 4 over I 76 Ml?

It is owned by the State Highway Agency.