US Bridges

Independence Ave. over Boulder & Whiterock Dtch

Fair

Boulder County, Colorado · 0.4 MI E of ST HWY 119 · Structure no. BC-46-1.6-ID

Built
1973
52 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete
Length
20 ft
1 main span
Daily traffic
574
2023 count
Owner
County
County Highway Agency

About this bridge

Independence Ave. over Boulder & Whiterock Dtch is a concrete culvert carrying Independence Ave. over Boulder & Whiterock Dtch in Boulder County, Colorado. It was built in 1973, so it is 52 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 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 574 vehicles a day, roughly 4% of them trucks, projected to reach 688 by 2043. The structure is 20 ft (6.2 m) long and 39 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesIndependence Ave.
CrossesBoulder & Whiterock Dtch
Location0.4 MI E of ST HWY 119
RouteCounty Highway 0
CountyBoulder County
StateColorado
Coordinates40.04011, -105.23566
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 protection6 SatisfactoryStructural elements show some minor deterioration.
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
Deck geometry7: Better than present minimum criteria
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 loadHS 20
Structure length20 ft (6.2 m)
Longest span20 ft (6.2 m)
Deck width39 ft (11.8 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic574 (2023)
Projected traffic688 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Independence Ave. over Boulder & Whiterock Dtch built?

It was built in 1973, making it 52 years old in 2025.

What condition is Independence Ave. over Boulder & Whiterock Dtch 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 Independence Ave. over Boulder & Whiterock Dtch carry?

About 574 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Independence Ave. over Boulder & Whiterock Dtch?

The structure is 20 ft (6.2 m) long with a longest span of 20 ft (6.2 m) and a deck 39 ft wide.

Who owns Independence Ave. over Boulder & Whiterock Dtch?

It is owned by the County Highway Agency.