US Bridges

County Road 129 over Willow Creek

Good

Routt County, Colorado · 22.1 MI N of US HWY 40 · Structure no. 107012922.10711

Built
1993
32 years old
Condition
Good
inspected October 2024
Type
Culvert
Concrete
Length
25 ft
2 main spans
Daily traffic
1,281
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 129 over Willow Creek is a concrete culvert carrying County Road 129 over Willow Creek in Routt County, Colorado. It was built in 1993, so it is 32 years old, younger than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,281 vehicles a day, roughly 29% of them trucks, projected to reach 1,525 by 2042. The structure is 25 ft (7.5 m) long and 60 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesCounty Road 129
CrossesWillow Creek
Location22.1 MI N of US HWY 40
RouteCounty Highway 0
CountyRoutt County
StateColorado
Coordinates40.76976, -106.91921
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: 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 rating86.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length25 ft (7.5 m)
Longest span12 ft (3.7 m)
Deck width60 ft (18.4 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,281 (2023)
Projected traffic1,525 by 2042
Trucks29%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 129 over Willow Creek built?

It was built in 1993, making it 32 years old in 2025.

What condition is County Road 129 over Willow Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.

How much traffic does County Road 129 over Willow Creek carry?

About 1,281 vehicles per day (2023 count), of which roughly 29% are trucks.

How long is County Road 129 over Willow Creek?

The structure is 25 ft (7.5 m) long with a longest span of 12 ft (3.7 m) and a deck 60 ft wide.

Who owns County Road 129 over Willow Creek?

It is owned by the County Highway Agency.