US Bridges

Interlocken Loop over Pedestrian Underpass

Fair

Broomfield County, Colorado · 125 Ft. N of Eldorado · Structure no. BFD-INTL-ELDOR

Built
1999
26 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete
Length
24 ft
1 main span
Daily traffic
12,139
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Interlocken Loop over Pedestrian Underpass is a concrete culvert carrying Interlocken Loop over Pedestrian Underpass in Broomfield County, Colorado. It was built in 1999, so it is 26 years old, younger 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 12,139 vehicles a day, roughly 7% of them trucks, projected to reach 14,567 by 2043. The structure is 24 ft (7.3 m) long and 126 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesInterlocken Loop
CrossesPedestrian Underpass
Location125 Ft. N of Eldorado
RouteCounty Highway 0
Coordinates39.92283, -105.12877
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
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span24 ft (7.3 m)
Deck width126 ft (38.4 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,139 (2023)
Projected traffic14,567 by 2043
Trucks7%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesPedestrian / bicycle
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Interlocken Loop over Pedestrian Underpass built?

It was built in 1999, making it 26 years old in 2025.

What condition is Interlocken Loop over Pedestrian Underpass 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 January 2025.

How much traffic does Interlocken Loop over Pedestrian Underpass carry?

About 12,139 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Interlocken Loop over Pedestrian Underpass?

The structure is 24 ft (7.3 m) long with a longest span of 24 ft (7.3 m) and a deck 126 ft wide.

Who owns Interlocken Loop over Pedestrian Underpass?

It is owned by the City or Municipal Highway Agency.