US Bridges

County Road 31 over Larimer and Weld Canal

Fair

Weld County, Colorado · 0.6 MI N of CO RD 74 · Structure no. WEL031.0_074.0A

Built
2008
17 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
49 ft
1 main span
Daily traffic
803
2021 count
Owner
County
County Highway Agency

About this bridge

County Road 31 over Larimer and Weld Canal is a steel stringer/multi-beam or girder carrying County Road 31 over Larimer and Weld Canal in Weld County, Colorado. It was built in 2008, so it is 17 years old, younger 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 803 vehicles a day, roughly 29% of them trucks, projected to reach 1,140 by 2041. The structure is 49 ft (14.9 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesCounty Road 31
CrossesLarimer and Weld Canal
Location0.6 MI N of CO RD 74
RouteCounty Highway 0
CountyWeld County
StateColorado
Coordinates40.53293, -104.77452
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.5 US tons
Inventory rating21.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length49 ft (14.9 m)
Longest span46 ft (13.9 m)
Deck width31 ft (9.5 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic803 (2021)
Projected traffic1,140 by 2041
Trucks29%
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 31 over Larimer and Weld Canal built?

It was built in 2008, making it 17 years old in 2025.

What condition is County Road 31 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 April 2024.

How much traffic does County Road 31 over Larimer and Weld Canal carry?

About 803 vehicles per day (2021 count), of which roughly 29% are trucks.

How long is County Road 31 over Larimer and Weld Canal?

The structure is 49 ft (14.9 m) long with a longest span of 46 ft (13.9 m) and a deck 31 ft wide.

Who owns County Road 31 over Larimer and Weld Canal?

It is owned by the County Highway Agency.