US Bridges

74th Avenue over Farmers Highline Canal

Fair

Jefferson County, Colorado · 0.15 MI West of Carr ST · Structure no. ARVA-74-0.90-02

Built
1930
95 years old
Condition
Fair
inspected March 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
24 ft
1 main span
Daily traffic
3,182
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

74th Avenue over Farmers Highline Canal is a steel stringer/multi-beam or girder carrying 74th Avenue over Farmers Highline Canal in Jefferson County, Colorado. It was built in 1930, so it is 95 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 3,182 vehicles a day, roughly 2% of them trucks, projected to reach 3,659 by 2041. The structure is 24 ft (7.2 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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Carries74th Avenue
CrossesFarmers Highline Canal
Location0.15 MI West of Carr ST
RouteCity Street 0
CountyJefferson County
StateColorado
Coordinates39.83078, -105.09341
Functional classUrban 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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
ScourScour critical; foundations unstable for calculated scour conditions
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 rating71.7 US tons
Inventory rating42.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length24 ft (7.2 m)
Longest span20 ft (6.1 m)
Deck width31 ft (9.3 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,182 (2021)
Projected traffic3,659 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$139,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 74th Avenue over Farmers Highline Canal built?

It was built in 1930, making it 95 years old in 2025.

What condition is 74th Avenue over Farmers Highline 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 74th Avenue over Farmers Highline Canal carry?

About 3,182 vehicles per day (2021 count), of which roughly 2% are trucks.

How long is 74th Avenue over Farmers Highline Canal?

The structure is 24 ft (7.2 m) long with a longest span of 20 ft (6.1 m) and a deck 31 ft wide.

Who owns 74th Avenue over Farmers Highline Canal?

It is owned by the City or Municipal Highway Agency.