US Bridges

Holly ST over Highline Canal

Fair

Denver County, Colorado · Holly and Iliff Ave · Structure no. D-10-HC-170

Built
1975
50 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
37 ft
1 main span
Daily traffic
6,506
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Holly ST over Highline Canal is a steel stringer/multi-beam or girder carrying Holly ST over Highline Canal in Denver County, Colorado. It was built in 1975, so it is 50 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 6,506 vehicles a day, roughly 4% of them trucks, projected to reach 7,221 by 2041. The structure is 37 ft (11.3 m) long and 56 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesHolly ST
CrossesHighline Canal
LocationHolly and Iliff Ave
RouteCity Street 0
CountyDenver County
StateColorado
Coordinates39.67569, -104.92227
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 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 rating36.7 US tons
Inventory rating22 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length37 ft (11.3 m)
Longest span33 ft (10.1 m)
Deck width56 ft (17.1 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,506 (2021)
Projected traffic7,221 by 2041
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Holly ST over Highline Canal built?

It was built in 1975, making it 50 years old in 2025.

What condition is Holly ST 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 December 2024.

How much traffic does Holly ST over Highline Canal carry?

About 6,506 vehicles per day (2021 count), of which roughly 4% are trucks.

How long is Holly ST over Highline Canal?

The structure is 37 ft (11.3 m) long with a longest span of 33 ft (10.1 m) and a deck 56 ft wide.

Who owns Holly ST over Highline Canal?

It is owned by the City or Municipal Highway Agency.