US Bridges

Northwest Parkway over Rock Creek

Fair

Broomfield County, Colorado · 0.2 MI N of US HWY 36 · Structure no. BFD-STRTK-US36

Built
1999
26 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete
Length
40 ft
3 main spans
Daily traffic
27,763
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Northwest Parkway over Rock Creek is a concrete culvert carrying Northwest Parkway over Rock Creek in Broomfield 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 27,763 vehicles a day, roughly 8% of them trucks, projected to reach 33,315 by 2043. The structure is 40 ft (12.2 m) long and 220 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesNorthwest Parkway
CrossesRock Creek
Location0.2 MI N of US HWY 36
RouteCounty Highway 0
CountyBroomfield County
StateColorado
Coordinates39.93726, -105.12632
Functional classUrban Minor Arterial

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 inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span14 ft (4.3 m)
Deck width220 ft (67.2 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,763 (2023)
Projected traffic33,315 by 2043
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Northwest Parkway over Rock Creek built?

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

What condition is Northwest Parkway 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 January 2025.

How much traffic does Northwest Parkway over Rock Creek carry?

About 27,763 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is Northwest Parkway over Rock Creek?

The structure is 40 ft (12.2 m) long with a longest span of 14 ft (4.3 m) and a deck 220 ft wide.

Who owns Northwest Parkway over Rock Creek?

It is owned by the City or Municipal Highway Agency.