US Bridges

Happy Canyon Road over I 25 Ml

Poor

Douglas County, Colorado · 5.1 MI N Castle Rock Bus. · Structure no. G-17-AG

Built
1965
60 years old
Condition
Poor
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
169 ft
2 main spans
Daily traffic
6,760
2024 count
Owner
State
State Highway Agency

About this bridge

Happy Canyon Road over I 25 Ml is a prestressed concrete stringer/multi-beam or girder carrying Happy Canyon Road over I 25 Ml 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 6,760 vehicles a day, roughly 10% of them trucks, projected to reach 9,058 by 2044. The structure is 169 ft (51.6 m) long and 32 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesHappy Canyon Road
CrossesI 25 Ml
Location5.1 MI N Castle Rock Bus.
RouteCity Street 0
CountyDouglas County
StateColorado
Coordinates39.44992, -104.87533
Functional classUrban Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment6: Equal to present minimum criteria
Operating rating52.2 US tons
Inventory rating25 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length169 ft (51.6 m)
Longest span85 ft (25.9 m)
Deck width32 ft (9.8 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,760 (2024)
Projected traffic9,058 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Happy Canyon Road over I 25 Ml built?

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

What condition is Happy Canyon Road over I 25 Ml in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2023.

How much traffic does Happy Canyon Road over I 25 Ml carry?

About 6,760 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is Happy Canyon Road over I 25 Ml?

The structure is 169 ft (51.6 m) long with a longest span of 85 ft (25.9 m) and a deck 32 ft wide.

Who owns Happy Canyon Road over I 25 Ml?

It is owned by the State Highway Agency.