US Bridges

County Road 1 over Slater Creek

Fair

Moffat County, Colorado · 1.1 M S. of Wym ST HWY 70 · Structure no. MOF1-01.11

Built
1940
85 years old, rebuilt 1975
Condition
Fair
inspected October 2023
Type
Girder and Floorbeam System
Steel
Length
33 ft
1 main span
Daily traffic
179
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 1 over Slater Creek is a steel girder and floorbeam system carrying County Road 1 over Slater Creek in Moffat County, Colorado. It was built in 1940 and reconstructed in 1975, so it is 85 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 179 vehicles a day, roughly 50% of them trucks, projected to reach 209 by 2042. The structure is 33 ft (10.1 m) long and 20 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

Location

Open in Google Maps
CarriesCounty Road 1
CrossesSlater Creek
Location1.1 M S. of Wym ST HWY 70
RouteCounty Highway 0
CountyMoffat County
StateColorado
Coordinates40.98621, -107.38172
Functional classRural Minor 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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating21.6 US tons
Inventory rating12.9 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length33 ft (10.1 m)
Longest span29 ft (8.7 m)
Deck width20 ft (6.1 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic179 (2023)
Projected traffic209 by 2042
Trucks50%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.7 mi (35 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$133,000 (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 1 over Slater Creek built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1975.

What condition is County Road 1 over Slater Creek 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 1 over Slater Creek carry?

About 179 vehicles per day (2023 count), of which roughly 50% are trucks.

How long is County Road 1 over Slater Creek?

The structure is 33 ft (10.1 m) long with a longest span of 29 ft (8.7 m) and a deck 20 ft wide.

Who owns County Road 1 over Slater Creek?

It is owned by the County Highway Agency.