US Bridges

County Road 21C / over Larimer County Canal

Good

Larimer County, Colorado · 1.0 MI N of CO RD 54G · Structure no. LR21C-1.0-54G-A

Built
1990
35 years old
Condition
Good
inspected March 2025
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
60 ft
1 main span
Daily traffic
945
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 21C / over Larimer County Canal is a prestressed concrete box beam or girders - single or spread carrying County Road 21C / over Larimer County Canal 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 945 vehicles a day, roughly 26% of them trucks, projected to reach 1,182 by 2043. The structure is 60 ft (18.3 m) long and 43 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesCounty Road 21C /
CrossesLarimer County Canal
Location1.0 MI N of CO RD 54G
RouteCounty Highway 0
CountyLarimer County
StateColorado
Coordinates40.64153, -105.13753
Functional classUrban Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 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 geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.8 US tons
Inventory rating27.8 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length60 ft (18.3 m)
Longest span55 ft (16.8 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic945 (2023)
Projected traffic1,182 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 21C / over Larimer County Canal built?

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

What condition is County Road 21C / over Larimer County Canal 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 21C / over Larimer County Canal carry?

About 945 vehicles per day (2023 count), of which roughly 26% are trucks.

How long is County Road 21C / over Larimer County Canal?

The structure is 60 ft (18.3 m) long with a longest span of 55 ft (16.8 m) and a deck 43 ft wide.

Who owns County Road 21C / over Larimer County Canal?

It is owned by the County Highway Agency.