US Bridges

Clarkson ST over Highline Canal

FairPosted for load

Arapahoe County, Colorado · .1 Mile N of Panama Drive · Structure no. CENT 17-2.3

Built
1950
75 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
28 ft
1 main span
Daily traffic
2,529
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Clarkson ST over Highline Canal is a steel stringer/multi-beam or girder carrying Clarkson ST over Highline Canal in Arapahoe County, Colorado. It was built in 1950, so it is 75 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. Its operating status is: posted for load restriction.

It carries about 2,529 vehicles a day, roughly 2% of them trucks, projected to reach 3,085 by 2041. The structure is 28 ft (8.5 m) long and 49 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesClarkson ST
CrossesHighline Canal
Location.1 Mile N of Panama Drive
RouteCity Street 0
CountyArapahoe County
StateColorado
Coordinates39.59979, -104.97821
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
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 rating16.3 US tons
Inventory rating9.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length28 ft (8.5 m)
Longest span26 ft (7.9 m)
Deck width49 ft (14.8 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,529 (2021)
Projected traffic3,085 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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 Clarkson ST over Highline Canal built?

It was built in 1950, making it 75 years old in 2025.

What condition is Clarkson 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 October 2023.

How much traffic does Clarkson ST over Highline Canal carry?

About 2,529 vehicles per day (2021 count), of which roughly 2% are trucks.

How long is Clarkson ST over Highline Canal?

The structure is 28 ft (8.5 m) long with a longest span of 26 ft (7.9 m) and a deck 49 ft wide.

Who owns Clarkson ST over Highline Canal?

It is owned by the City or Municipal Highway Agency.