US Bridges

Rock Creek Pkwy. over Rock Creek

Fair

Boulder County, Colorado · 0.3 MI N of Coalton D · Structure no. SUPER-ROCKCKBL

Built
1999
26 years old
Condition
Fair
inspected February 2025
Type
Culvert
Concrete
Length
101 ft
4 main spans
Daily traffic
11,360
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Rock Creek Pkwy. over Rock Creek is a concrete culvert carrying Rock Creek Pkwy. over Rock Creek in Boulder County, Colorado. It was built in 1999, so it is 26 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 6 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 11,360 vehicles a day, roughly 5% of them trucks, projected to reach 13,632 by 2043. The structure is 101 ft (30.8 m) long and 98 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesRock Creek Pkwy.
CrossesRock Creek
Location0.3 MI N of Coalton D
RouteCity Street 0
CountyBoulder County
StateColorado
Coordinates39.93322, -105.14577
Functional classUrban 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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.2 US tons
Inventory rating27 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadHS 20
Structure length101 ft (30.8 m)
Longest span23 ft (7 m)
Deck width98 ft (29.9 m)
Roadway width92 ft (27.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,360 (2023)
Projected traffic13,632 by 2043
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Rock Creek Pkwy. over Rock Creek built?

It was built in 1999, making it 26 years old in 2025.

What condition is Rock Creek Pkwy. 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 February 2025.

How much traffic does Rock Creek Pkwy. over Rock Creek carry?

About 11,360 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Rock Creek Pkwy. over Rock Creek?

The structure is 101 ft (30.8 m) long with a longest span of 23 ft (7 m) and a deck 98 ft wide.

Who owns Rock Creek Pkwy. over Rock Creek?

It is owned by the Town or Township Highway Agency.