US Bridges

County Road 18 over Fortification Creek

FairPosted for load

Moffat County, Colorado · 0.2 MI South of ST HWY 13 · Structure no. MOF18-00.19

Built
1950
75 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
40 ft
1 main span
Daily traffic
71
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 18 over Fortification Creek is a steel stringer/multi-beam or girder carrying County Road 18 over Fortification Creek in Moffat County, Colorado. It was built in 1950, so it is 75 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. Its operating status is: posted for other load-capacity restriction.

It carries about 71 vehicles a day, roughly 56% of them trucks, projected to reach 83 by 2042. The structure is 40 ft (12.3 m) long and 24 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesCounty Road 18
CrossesFortification Creek
Location0.2 MI South of ST HWY 13
RouteCounty Highway 0
CountyMoffat County
StateColorado
Coordinates40.62219, -107.46731
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating28.1 US tons
Inventory rating16.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length40 ft (12.3 m)
Longest span39 ft (11.8 m)
Deck width24 ft (7.4 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic71 (2023)
Projected traffic83 by 2042
Trucks56%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 18 over Fortification Creek built?

It was built in 1950, making it 75 years old in 2025.

What condition is County Road 18 over Fortification 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 18 over Fortification Creek carry?

About 71 vehicles per day (2023 count), of which roughly 56% are trucks.

How long is County Road 18 over Fortification Creek?

The structure is 40 ft (12.3 m) long with a longest span of 39 ft (11.8 m) and a deck 24 ft wide.

Who owns County Road 18 over Fortification Creek?

It is owned by the County Highway Agency.