US Bridges

Iliff Ave over West Tollgate Creek

Fair

Arapahoe County, Colorado · 0.3 MI E of Buckley RD · Structure no. AUR14.1-L.5

Built
1980
45 years old
Condition
Fair
inspected October 2023
Type
Culvert
Concrete
Length
66 ft
5 main spans
Daily traffic
32,075
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Iliff Ave over West Tollgate Creek is a concrete culvert carrying Iliff Ave over West Tollgate Creek in Arapahoe County, Colorado. It was built in 1980, so it is 45 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 32,075 vehicles a day, roughly 2% of them trucks, projected to reach 39,132 by 2041. The structure is 66 ft (20 m) long and 104 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesIliff Ave
CrossesWest Tollgate Creek
Location0.3 MI E of Buckley RD
RouteCity Street 0
CountyArapahoe County
StateColorado
Coordinates39.6736, -104.78624
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 inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
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 rating49.4 US tons
Inventory rating29.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans5
Design loadHS 20
Structure length66 ft (20 m)
Longest span12 ft (3.8 m)
Deck width104 ft (31.6 m)
Roadway width78 ft (23.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32,075 (2021)
Projected traffic39,132 by 2041
Trucks2%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Iliff Ave over West Tollgate Creek built?

It was built in 1980, making it 45 years old in 2025.

What condition is Iliff Ave over West Tollgate Creek 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 October 2023.

How much traffic does Iliff Ave over West Tollgate Creek carry?

About 32,075 vehicles per day (2021 count), of which roughly 2% are trucks.

How long is Iliff Ave over West Tollgate Creek?

The structure is 66 ft (20 m) long with a longest span of 12 ft (3.8 m) and a deck 104 ft wide.

Who owns Iliff Ave over West Tollgate Creek?

It is owned by the City or Municipal Highway Agency.