US Bridges

County Road 3 over Larimer and Weld Canal

Fair

Larimer County, Colorado · 0.5 MI N of CO RD 44 · Structure no. LR3-0.5-44-A

Built
1960
65 years old, rebuilt 2005
Condition
Fair
inspected March 2025
Type
Slab
Prestressed Concrete
Length
46 ft
1 main span
Daily traffic
412
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 3 over Larimer and Weld Canal is a prestressed concrete slab carrying County Road 3 over Larimer and Weld Canal in Larimer County, Colorado. It was built in 1960 and reconstructed in 2005, so it is 65 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 412 vehicles a day, roughly 33% of them trucks, projected to reach 515 by 2043. The structure is 46 ft (14 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesCounty Road 3
CrossesLarimer and Weld Canal
Location0.5 MI N of CO RD 44
RouteCounty Highway 0
CountyLarimer County
StateColorado
Coordinates40.57547, -104.96306
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating103.5 US tons
Inventory rating60.8 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length46 ft (14 m)
Longest span42 ft (12.8 m)
Deck width28 ft (8.4 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic412 (2023)
Projected traffic515 by 2043
Trucks33%
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 3 over Larimer and Weld Canal built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 2005.

What condition is County Road 3 over Larimer and Weld Canal 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 March 2025.

How much traffic does County Road 3 over Larimer and Weld Canal carry?

About 412 vehicles per day (2023 count), of which roughly 33% are trucks.

How long is County Road 3 over Larimer and Weld Canal?

The structure is 46 ft (14 m) long with a longest span of 42 ft (12.8 m) and a deck 28 ft wide.

Who owns County Road 3 over Larimer and Weld Canal?

It is owned by the County Highway Agency.