US Bridges

Interlocken Loop N over W. Flatiron Crossing Dr.

Good

Broomfield County, Colorado · 400 Ft N. of Interlocken · Structure no. BFD-INTLE-W.FLT

Built
2000
25 years old
Condition
Good
inspected January 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
154 ft
2 main spans
Daily traffic
6,228
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Interlocken Loop N over W. Flatiron Crossing Dr. is a prestressed concrete continuous stringer/multi-beam or girder carrying Interlocken Loop N over W. Flatiron Crossing Dr. in Broomfield County, Colorado. It was built in 2000, so it is 25 years old, younger than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 6,228 vehicles a day, roughly 6% of them trucks, projected to reach 7,473 by 2043. The structure is 154 ft (46.9 m) long and 49 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesInterlocken Loop N
CrossesW. Flatiron Crossing Dr.
Location400 Ft N. of Interlocken
RouteCounty Highway 0
Coordinates39.93054, -105.12765
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length154 ft (46.9 m)
Longest span72 ft (21.9 m)
Deck width49 ft (14.8 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,228 (2023)
Projected traffic7,473 by 2043
Trucks6%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$875,000 (2019 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Interlocken Loop N over W. Flatiron Crossing Dr. built?

It was built in 2000, making it 25 years old in 2025.

What condition is Interlocken Loop N over W. Flatiron Crossing Dr. in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2025.

How much traffic does Interlocken Loop N over W. Flatiron Crossing Dr. carry?

About 6,228 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is Interlocken Loop N over W. Flatiron Crossing Dr.?

The structure is 154 ft (46.9 m) long with a longest span of 72 ft (21.9 m) and a deck 49 ft wide.

Who owns Interlocken Loop N over W. Flatiron Crossing Dr.?

It is owned by the City or Municipal Highway Agency.