US Bridges

County Road 18S over Fortification Creek

Fair

Moffat County, Colorado · 0.11 MI East of ST HWY 13 · Structure no. MOF18S-00.11

Built
1987
38 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
67 ft
1 main span
Daily traffic
303
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 18S over Fortification Creek is a steel stringer/multi-beam or girder carrying County Road 18S over Fortification Creek in Moffat County, Colorado. It was built in 1987, so it is 38 years old, younger 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 303 vehicles a day, roughly 28% of them trucks, projected to reach 355 by 2042. The structure is 67 ft (20.4 m) long and 29 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesCounty Road 18S
CrossesFortification Creek
Location0.11 MI East of ST HWY 13
RouteCounty Highway 0
CountyMoffat County
StateColorado
Coordinates40.59346, -107.47402
Functional classRural Local

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating46.3 US tons
Inventory rating27.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length67 ft (20.4 m)
Longest span64 ft (19.6 m)
Deck width29 ft (8.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic303 (2023)
Projected traffic355 by 2042
Trucks28%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 18S over Fortification Creek built?

It was built in 1987, making it 38 years old in 2025.

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

About 303 vehicles per day (2023 count), of which roughly 28% are trucks.

How long is County Road 18S over Fortification Creek?

The structure is 67 ft (20.4 m) long with a longest span of 64 ft (19.6 m) and a deck 29 ft wide.

Who owns County Road 18S over Fortification Creek?

It is owned by the County Highway Agency.