US Bridges

County Road 37 over Rabbit Creek

Fair

Larimer County, Colorado · 1.3 MI N of CO RD 74E · Structure no. LR37-1.3-74E

Built
1981
44 years old
Condition
Fair
inspected May 2023
Type
Culvert
Concrete
Length
29 ft
2 main spans
Daily traffic
103
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 37 over Rabbit Creek is a concrete culvert carrying County Road 37 over Rabbit Creek in Larimer County, Colorado. It was built in 1981, so it is 44 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 103 vehicles a day, roughly 36% of them trucks, projected to reach 129 by 2042. The structure is 29 ft (8.8 m) long and 43 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesCounty Road 37
CrossesRabbit Creek
Location1.3 MI N of CO RD 74E
RouteCounty Highway 0
CountyLarimer County
StateColorado
Coordinates40.81022, -105.28583
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating81.7 US tons
Inventory rating49.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length29 ft (8.8 m)
Longest span14 ft (4.3 m)
Deck width43 ft (13.2 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic103 (2023)
Projected traffic129 by 2042
Trucks36%
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 37 over Rabbit Creek built?

It was built in 1981, making it 44 years old in 2025.

What condition is County Road 37 over Rabbit 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 May 2023.

How much traffic does County Road 37 over Rabbit Creek carry?

About 103 vehicles per day (2023 count), of which roughly 36% are trucks.

How long is County Road 37 over Rabbit Creek?

The structure is 29 ft (8.8 m) long with a longest span of 14 ft (4.3 m) and a deck 43 ft wide.

Who owns County Road 37 over Rabbit Creek?

It is owned by the County Highway Agency.