US Bridges

County Road 21C over Cache LA Poudre River

Fair

Larimer County, Colorado · 0.2 MI N of CO RD 50E · Structure no. LR21C-0.2-50E

Built
1976
49 years old
Condition
Fair
inspected April 2023
Type
Tee Beam
Prestressed Concrete
Length
161 ft
2 main spans
Daily traffic
3,333
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 21C over Cache LA Poudre River is a prestressed concrete tee beam carrying County Road 21C over Cache LA Poudre River in Larimer County, Colorado. It was built in 1976, so it is 49 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 5 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 3,333 vehicles a day, roughly 16% of them trucks, projected to reach 4,166 by 2043. The structure is 161 ft (49.2 m) long and 48 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCounty Road 21C
CrossesCache LA Poudre River
Location0.2 MI N of CO RD 50E
RouteCounty Highway 0
CountyLarimer County
StateColorado
Coordinates40.62078, -105.13961
Functional classUrban Minor Arterial

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.3 US tons
Inventory rating14.6 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length161 ft (49.2 m)
Longest span77 ft (23.4 m)
Deck width48 ft (14.6 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,333 (2023)
Projected traffic4,166 by 2043
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.7 mi (6 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 Cache LA Poudre River built?

It was built in 1976, making it 49 years old in 2025.

What condition is County Road 21C over Cache LA Poudre River 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 April 2023.

How much traffic does County Road 21C over Cache LA Poudre River carry?

About 3,333 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is County Road 21C over Cache LA Poudre River?

The structure is 161 ft (49.2 m) long with a longest span of 77 ft (23.4 m) and a deck 48 ft wide.

Who owns County Road 21C over Cache LA Poudre River?

It is owned by the County Highway Agency.