US Bridges

County Road 4 over Little Snake River

Fair

Moffat County, Colorado · 28.4 MI West of ST HWY 13 · Structure no. MOF4-28.40

Built
1976
49 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
120 ft
3 main spans
Daily traffic
288
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 4 over Little Snake River is a steel stringer/multi-beam or girder carrying County Road 4 over Little Snake River in Moffat County, Colorado. It was built in 1976, so it is 49 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 288 vehicles a day, roughly 65% of them trucks, projected to reach 337 by 2042. The structure is 120 ft (36.7 m) long and 30 ft wide. If it were closed, the detour would be 60.3 mi (97 km).

Location

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CarriesCounty Road 4
CrossesLittle Snake River
Location28.4 MI West of ST HWY 13
RouteCounty Highway 0
CountyMoffat County
StateColorado
Coordinates40.91574, -108.08999
Functional classRural Major Collector

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.1 US tons
Inventory rating28.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans3
Design loadHS 20
Structure length120 ft (36.7 m)
Longest span39 ft (11.8 m)
Deck width30 ft (9.2 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic288 (2023)
Projected traffic337 by 2042
Trucks65%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed60.3 mi (97 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Little Snake River built?

It was built in 1976, making it 49 years old in 2025.

What condition is County Road 4 over Little Snake River 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 October 2023.

How much traffic does County Road 4 over Little Snake River carry?

About 288 vehicles per day (2023 count), of which roughly 65% are trucks.

How long is County Road 4 over Little Snake River?

The structure is 120 ft (36.7 m) long with a longest span of 39 ft (11.8 m) and a deck 30 ft wide.

Who owns County Road 4 over Little Snake River?

It is owned by the County Highway Agency.