US Bridges

County Road Qq over Rock Creek

Fair

Washington County, Colorado · 0.95 Mi. N. of Co. Rd. 54 · Structure no. WTNQQ-54.95-A

Built
1986
39 years old
Condition
Fair
inspected October 2023
Type
Culvert
Steel
Length
24 ft
2 main spans
Daily traffic
21
2023 count
Owner
County
County Highway Agency

About this bridge

County Road Qq over Rock Creek is a steel culvert carrying County Road Qq over Rock Creek in Washington County, Colorado. It was built in 1986, so it is 39 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 21 vehicles a day, roughly 31% of them trucks, projected to reach 26 by 2042. The structure is 24 ft (7.2 m) long and 62 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesCounty Road Qq
CrossesRock Creek
Location0.95 Mi. N. of Co. Rd. 54
RouteCounty Highway 0
CountyWashington County
StateColorado
Coordinates40.36544, -102.96992
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 inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating110.1 US tons
Inventory rating93.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20
Structure length24 ft (7.2 m)
Longest span10 ft (3 m)
Deck width62 ft (18.8 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21 (2023)
Projected traffic26 by 2042
Trucks31%
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 Qq over Rock Creek built?

It was built in 1986, making it 39 years old in 2025.

What condition is County Road Qq over Rock 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 Qq over Rock Creek carry?

About 21 vehicles per day (2023 count), of which roughly 31% are trucks.

How long is County Road Qq over Rock Creek?

The structure is 24 ft (7.2 m) long with a longest span of 10 ft (3 m) and a deck 62 ft wide.

Who owns County Road Qq over Rock Creek?

It is owned by the County Highway Agency.