US Bridges

Interlocken Blvd. over Ped. Underpass/Drainage

Fair

Broomfield County, Colorado · 100 Ft SE of W Flatiron · Structure no. BFD-INTB-W.FLAT

Built
1999
26 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete
Length
26 ft
1 main span
Daily traffic
5,799
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Interlocken Blvd. over Ped. Underpass/Drainage is a concrete culvert carrying Interlocken Blvd. over Ped. Underpass/Drainage 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 5,799 vehicles a day, roughly 5% of them trucks, projected to reach 6,958 by 2042. The structure is 26 ft (7.9 m) long and 131 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesInterlocken Blvd.
CrossesPed. Underpass/Drainage
Location100 Ft SE of W Flatiron
RouteCounty Highway 0
CountyBroomfield County
StateColorado
Coordinates39.92941, -105.13055
Functional classUrban Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating110.1 US tons
Inventory rating81.2 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span26 ft (7.9 m)
Deck width131 ft (39.8 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,799 (2023)
Projected traffic6,958 by 2042
Trucks5%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
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 Blvd. over Ped. Underpass/Drainage built?

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

What condition is Interlocken Blvd. over Ped. Underpass/Drainage 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 Blvd. over Ped. Underpass/Drainage carry?

About 5,799 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Interlocken Blvd. over Ped. Underpass/Drainage?

The structure is 26 ft (7.9 m) long with a longest span of 26 ft (7.9 m) and a deck 131 ft wide.

Who owns Interlocken Blvd. over Ped. Underpass/Drainage?

It is owned by the City or Municipal Highway Agency.