US Bridges

County Road 47 over Little Thomson River

Good

Larimer County, Colorado · 0.1 MI W of SH36 · Structure no. LR47-S0.1-S36-A

Built
2015
10 years old
Condition
Good
inspected April 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
66 ft
1 main span
Daily traffic
277
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 47 over Little Thomson River is a prestressed concrete box beam or girders - multiple carrying County Road 47 over Little Thomson River in Larimer County, Colorado. It was built in 2015, so it is 10 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 277 vehicles a day, roughly 23% of them trucks, projected to reach 346 by 2042. The structure is 66 ft (20.1 m) long and 32 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesCounty Road 47
CrossesLittle Thomson River
Location0.1 MI W of SH36
RouteCounty Highway 0
Coordinates40.28806, -105.37528
Functional classRural 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.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating63.6 US tons
Inventory rating48.9 US tons

Structure

MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHL 93
Structure length66 ft (20.1 m)
Longest span58 ft (17.7 m)
Deck width32 ft (9.7 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic277 (2023)
Projected traffic346 by 2042
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 47 over Little Thomson River built?

It was built in 2015, making it 10 years old in 2025.

What condition is County Road 47 over Little Thomson 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 2023.

How much traffic does County Road 47 over Little Thomson River carry?

About 277 vehicles per day (2023 count), of which roughly 23% are trucks.

How long is County Road 47 over Little Thomson River?

The structure is 66 ft (20.1 m) long with a longest span of 58 ft (17.7 m) and a deck 32 ft wide.

Who owns County Road 47 over Little Thomson River?

It is owned by the County Highway Agency.