US Bridges

County Road 18 over N. Branch Conejos River

Good

Conejos County, Colorado · 0.5 MI S of Manassa · Structure no. CON05.0E-05.8NA

Built
1990
35 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
42 ft
1 main span
Daily traffic
223
2022 count
Owner
County
County Highway Agency

About this bridge

County Road 18 over N. Branch Conejos River is a steel stringer/multi-beam or girder carrying County Road 18 over N. Branch Conejos River in Conejos County, Colorado. It was built in 1990, so it is 35 years old, younger than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 223 vehicles a day, roughly 2% of them trucks, projected to reach 256 by 2042. The structure is 42 ft (12.7 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesCounty Road 18
CrossesN. Branch Conejos River
Location0.5 MI S of Manassa
RouteCounty Highway 0
CountyConejos County
StateColorado
Coordinates37.16396, -105.92833
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating51.1 US tons
Inventory rating30.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length42 ft (12.7 m)
Longest span38 ft (11.7 m)
Deck width31 ft (9.4 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic223 (2022)
Projected traffic256 by 2042
Trucks2%
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 18 over N. Branch Conejos River built?

It was built in 1990, making it 35 years old in 2025.

What condition is County Road 18 over N. Branch Conejos River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2023.

How much traffic does County Road 18 over N. Branch Conejos River carry?

About 223 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is County Road 18 over N. Branch Conejos River?

The structure is 42 ft (12.7 m) long with a longest span of 38 ft (11.7 m) and a deck 31 ft wide.

Who owns County Road 18 over N. Branch Conejos River?

It is owned by the County Highway Agency.