US Bridges

2nd Avenue over Coal Creek

Fair

Boulder County, Colorado · 0.2 MI South of Williams · Structure no. SUPER-2ND-AVE

Built
1992
33 years old, rebuilt 2017
Condition
Fair
inspected February 2025
Type
Slab
Concrete
Length
66 ft
2 main spans
Daily traffic
492
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

2nd Avenue over Coal Creek is a concrete slab carrying 2nd Avenue over Coal Creek in Boulder County, Colorado. It was built in 1992 and reconstructed in 2017, so it is 33 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 492 vehicles a day, roughly 18% of them trucks, projected to reach 591 by 2043. The structure is 66 ft (20.1 m) long and 25 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
Carries2nd Avenue
CrossesCoal Creek
Location0.2 MI South of Williams
RouteCity Street 0
CountyBoulder County
StateColorado
Coordinates39.95211, -105.16811
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length66 ft (20.1 m)
Longest span30 ft (9.1 m)
Deck width25 ft (7.6 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic492 (2023)
Projected traffic591 by 2043
Trucks18%
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

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 2nd Avenue over Coal Creek built?

It was built in 1992, making it 33 years old in 2025. It was reconstructed in 2017.

What condition is 2nd Avenue over Coal 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 2nd Avenue over Coal Creek carry?

About 492 vehicles per day (2023 count), of which roughly 18% are trucks.

How long is 2nd Avenue over Coal Creek?

The structure is 66 ft (20.1 m) long with a longest span of 30 ft (9.1 m) and a deck 25 ft wide.

Who owns 2nd Avenue over Coal Creek?

It is owned by the Town or Township Highway Agency.