US Bridges

County Road 66 over Box Elder Creek

Good

Larimer County, Colorado · 0.3 MI E of CR 9 · Structure no. LR66-0.3-9

Built
1990
35 years old
Condition
Good
inspected March 2025
Type
Culvert
Concrete
Length
30 ft
2 main spans
Daily traffic
331
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 66 over Box Elder Creek is a concrete culvert carrying County Road 66 over Box Elder Creek in Larimer County, Colorado. It was built in 1990, so it is 35 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 331 vehicles a day, roughly 26% of them trucks, projected to reach 413 by 2043. The structure is 30 ft (9.2 m) long and 34 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCounty Road 66
CrossesBox Elder Creek
Location0.3 MI E of CR 9
RouteCounty Highway 0
CountyLarimer County
StateColorado
Coordinates40.72575, -105.01311
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
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionMarch 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.2 US tons
Inventory rating28.2 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length30 ft (9.2 m)
Longest span14 ft (4.4 m)
Deck width34 ft (10.5 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic331 (2023)
Projected traffic413 by 2043
Trucks26%
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

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 66 over Box Elder Creek built?

It was built in 1990, making it 35 years old in 2025.

What condition is County Road 66 over Box Elder 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 March 2025.

How much traffic does County Road 66 over Box Elder Creek carry?

About 331 vehicles per day (2023 count), of which roughly 26% are trucks.

How long is County Road 66 over Box Elder Creek?

The structure is 30 ft (9.2 m) long with a longest span of 14 ft (4.4 m) and a deck 34 ft wide.

Who owns County Road 66 over Box Elder Creek?

It is owned by the County Highway Agency.