US Bridges

County Road 15 over Little Thompson River

Good

Weld County, Colorado · 0.7 MI N of CO RD 44 · Structure no. JSTWN-002

Built
1989
36 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
91 ft
1 main span
Daily traffic
311
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

County Road 15 over Little Thompson River is a prestressed concrete stringer/multi-beam or girder carrying County Road 15 over Little Thompson River in Weld County, Colorado. It was built in 1989, so it is 36 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 311 vehicles a day, roughly 40% of them trucks, projected to reach 441 by 2042. The structure is 91 ft (27.6 m) long and 34 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesCounty Road 15
CrossesLittle Thompson River
Location0.7 MI N of CO RD 44
RouteCity Street 0
Coordinates40.31564, -104.92352
Functional classUrban Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.8 US tons
Inventory rating46.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length91 ft (27.6 m)
Longest span85 ft (26 m)
Deck width34 ft (10.5 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic311 (2023)
Projected traffic441 by 2042
Trucks40%
Lanes on structure2
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 15 over Little Thompson River built?

It was built in 1989, making it 36 years old in 2025.

What condition is County Road 15 over Little Thompson River 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 April 2024.

How much traffic does County Road 15 over Little Thompson River carry?

About 311 vehicles per day (2023 count), of which roughly 40% are trucks.

How long is County Road 15 over Little Thompson River?

The structure is 91 ft (27.6 m) long with a longest span of 85 ft (26 m) and a deck 34 ft wide.

Who owns County Road 15 over Little Thompson River?

It is owned by the City or Municipal Highway Agency.