US Bridges

County Road 70 over North Poudre Canal

Fair

Larimer County, Colorado · 0.1 MI E of CO RD 15 · Structure no. LR70-0.1-15

Built
1940
85 years old, rebuilt 1965
Condition
Fair
inspected March 2025
Type
Slab
Concrete
Length
29 ft
1 main span
Daily traffic
6,105
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 70 over North Poudre Canal is a concrete slab carrying County Road 70 over North Poudre Canal in Larimer County, Colorado. It was built in 1940 and reconstructed in 1965, so it is 85 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 6,105 vehicles a day, roughly 33% of them trucks, projected to reach 7,631 by 2043. The structure is 29 ft (8.7 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesCounty Road 70
CrossesNorth Poudre Canal
Location0.1 MI E of CO RD 15
RouteCounty Highway 0
CountyLarimer County
StateColorado
Coordinates40.75478, -105.07469
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionMarch 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length29 ft (8.7 m)
Longest span27 ft (8.1 m)
Deck width30 ft (9.2 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,105 (2023)
Projected traffic7,631 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 70 over North Poudre Canal built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1965.

What condition is County Road 70 over North Poudre 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 70 over North Poudre Canal carry?

About 6,105 vehicles per day (2023 count), of which roughly 33% are trucks.

How long is County Road 70 over North Poudre Canal?

The structure is 29 ft (8.7 m) long with a longest span of 27 ft (8.1 m) and a deck 30 ft wide.

Who owns County Road 70 over North Poudre Canal?

It is owned by the County Highway Agency.