US Bridges

E. Iliff Ave. over Highline Canal

Fair

Arapahoe County, Colorado · 0.45 MI W. of Parker Road · Structure no. ARA 20-9.2

Built
1977
48 years old, rebuilt 2021
Condition
Fair
inspected November 2023
Type
Culvert
Concrete
Length
32 ft
1 main span
Daily traffic
38,491
2021 count
Owner
County
County Highway Agency

About this bridge

E. Iliff Ave. over Highline Canal is a concrete culvert carrying E. Iliff Ave. over Highline Canal in Arapahoe County, Colorado. It was built in 1977 and reconstructed in 2021, so it is 48 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 6 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 38,491 vehicles a day, roughly 5% of them trucks, projected to reach 46,959 by 2041. The structure is 32 ft (9.8 m) long and 177 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesE. Iliff Ave.
CrossesHighline Canal
Location0.45 MI W. of Parker Road
RouteCounty Highway 0
CountyArapahoe County
StateColorado
Coordinates39.67468, -104.88045
Functional classUrban Other Principal 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
Channel and channel protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
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 rating61.1 US tons
Inventory rating47.2 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length32 ft (9.8 m)
Longest span32 ft (9.8 m)
Deck width177 ft (53.8 m)
Roadway width72 ft (21.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38,491 (2021)
Projected traffic46,959 by 2041
Trucks5%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

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 E. Iliff Ave. over Highline Canal built?

It was built in 1977, making it 48 years old in 2025. It was reconstructed in 2021.

What condition is E. Iliff Ave. over 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 November 2023.

How much traffic does E. Iliff Ave. over Highline Canal carry?

About 38,491 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is E. Iliff Ave. over Highline Canal?

The structure is 32 ft (9.8 m) long with a longest span of 32 ft (9.8 m) and a deck 177 ft wide.

Who owns E. Iliff Ave. over Highline Canal?

It is owned by the County Highway Agency.