US Bridges

County Line RD over Highline Canal

Fair

Douglas County, Colorado · 0.5 MI W of Broadway · Structure no. LTNF.120-03.949

Built
1965
60 years old
Condition
Fair
inspected September 2023
Type
Tee Beam
Concrete
Length
70 ft
1 main span
Daily traffic
10,720
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

County Line RD over Highline Canal is a concrete tee beam carrying County Line RD over Highline Canal in Douglas County, Colorado. It was built in 1965, so it is 60 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 10,720 vehicles a day, roughly 6% of them trucks, projected to reach 13,078 by 2041. The structure is 70 ft (21.2 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCounty Line RD
CrossesHighline Canal
Location0.5 MI W of Broadway
RouteCity Street 0
CountyDouglas County
StateColorado
Coordinates39.56472, -104.99903
Functional classUrban Minor 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 alignment6: Equal to present minimum criteria
Operating rating40.7 US tons
Inventory rating31.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length70 ft (21.2 m)
Longest span29 ft (8.9 m)
Deck width32 ft (9.8 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,720 (2021)
Projected traffic13,078 by 2041
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$373,000
NavigationNo navigation control on waterway

Frequently asked questions

When was County Line RD over Highline Canal built?

It was built in 1965, making it 60 years old in 2025.

What condition is County Line RD 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 September 2023.

How much traffic does County Line RD over Highline Canal carry?

About 10,720 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is County Line RD over Highline Canal?

The structure is 70 ft (21.2 m) long with a longest span of 29 ft (8.9 m) and a deck 32 ft wide.

Who owns County Line RD over Highline Canal?

It is owned by the City or Municipal Highway Agency.