US Bridges

County Road 21 over Adobe Creek

Fair

Mesa County, Colorado · .7 MI N of RD K · Structure no. MESA-21-K.7

Built
1950
75 years old
Condition
Fair
inspected January 2024
Type
Culvert
Concrete
Length
29 ft
1 main span
Daily traffic
567
2022 count
Owner
County
County Highway Agency

About this bridge

County Road 21 over Adobe Creek is a concrete culvert carrying County Road 21 over Adobe Creek in Mesa 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 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 567 vehicles a day, roughly 2% of them trucks, projected to reach 664 by 2042. The structure is 29 ft (8.7 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesCounty Road 21
CrossesAdobe Creek
Location.7 MI N of RD K
RouteCounty Highway 0
CountyMesa County
StateColorado
Coordinates39.17508, -108.66386
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2024
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
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length29 ft (8.7 m)
Longest span29 ft (8.7 m)
Deck width30 ft (9 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic567 (2022)
Projected traffic664 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 21 over Adobe Creek built?

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

What condition is County Road 21 over Adobe 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 January 2024.

How much traffic does County Road 21 over Adobe Creek carry?

About 567 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is County Road 21 over Adobe Creek?

The structure is 29 ft (8.7 m) long with a longest span of 29 ft (8.7 m) and a deck 30 ft wide.

Who owns County Road 21 over Adobe Creek?

It is owned by the County Highway Agency.