US Bridges

West Sixth Avenue over Graves and Dennison Dtch

Fair

Broomfield County, Colorado · At Int of Alter & 6th · Structure no. BFD-W.6TH-ALTER

Built
1985
40 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete
Length
54 ft
2 main spans
Daily traffic
3,667
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

West Sixth Avenue over Graves and Dennison Dtch is a concrete culvert carrying West Sixth Avenue over Graves and Dennison Dtch in Broomfield County, Colorado. It was built in 1985, so it is 40 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 3,667 vehicles a day, roughly 15% of them trucks, projected to reach 4,400 by 2043. The structure is 54 ft (16.4 m) long and 61 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesWest Sixth Avenue
CrossesGraves and Dennison Dtch
LocationAt Int of Alter & 6th
RouteCounty Highway 0
CountyBroomfield County
StateColorado
Coordinates39.92557, -105.09179
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length54 ft (16.4 m)
Longest span26 ft (7.8 m)
Deck width61 ft (18.6 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,667 (2023)
Projected traffic4,400 by 2043
Trucks15%
Lanes on structure3
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 West Sixth Avenue over Graves and Dennison Dtch built?

It was built in 1985, making it 40 years old in 2025.

What condition is West Sixth Avenue over Graves and Dennison Dtch 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 West Sixth Avenue over Graves and Dennison Dtch carry?

About 3,667 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is West Sixth Avenue over Graves and Dennison Dtch?

The structure is 54 ft (16.4 m) long with a longest span of 26 ft (7.8 m) and a deck 61 ft wide.

Who owns West Sixth Avenue over Graves and Dennison Dtch?

It is owned by the City or Municipal Highway Agency.