US Bridges

Wild Basin Road over North St. Vrain Creek

Fair

Boulder County, Colorado · 2.1 Miles from Park Bound · Structure no. 1520012P0000000

Built
1982
43 years old
Condition
Fair
inspected October 2024
Type
Tee Beam
Prestressed Concrete
Length
25 ft
1 main span
Daily traffic
75
2019 count
Owner
Federal
National Park Service

About this bridge

Wild Basin Road over North St. Vrain Creek is a prestressed concrete tee beam carrying Wild Basin Road over North St. Vrain Creek in Boulder County, Colorado. It was built in 1982, so it is 43 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 75 vehicles a day, roughly 1% of them trucks, projected to reach 150 by 2039. The structure is 25 ft (7.6 m) long and 18 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesWild Basin Road
CrossesNorth St. Vrain Creek
Location2.1 Miles from Park Bound
RouteFederal Lands Road 0
Coordinates40.20825, -105.56511
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
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 geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span23 ft (7 m)
Deck width18 ft (5.5 m)
Roadway width16 ft (4.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2019)
Projected traffic150 by 2039
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerNational Park Service
Maintained byNational Park Service
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$12,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Wild Basin Road over North St. Vrain Creek built?

It was built in 1982, making it 43 years old in 2025.

What condition is Wild Basin Road over North St. Vrain 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 2024.

How much traffic does Wild Basin Road over North St. Vrain Creek carry?

About 75 vehicles per day (2019 count), of which roughly 1% are trucks.

How long is Wild Basin Road over North St. Vrain Creek?

The structure is 25 ft (7.6 m) long with a longest span of 23 ft (7 m) and a deck 18 ft wide.

Who owns Wild Basin Road over North St. Vrain Creek?

It is owned by the National Park Service.