US Bridges

US 6 Ml over Lena Gulch

Fair

Jefferson County, Colorado · 3.2 MI E of JCT SH 58 · Structure no. F-16-M

Built
1951
74 years old
Condition
Fair
inspected November 2023
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
31,000
2020 count
Owner
State
State Highway Agency

About this bridge

US 6 Ml over Lena Gulch is a concrete culvert carrying US 6 Ml over Lena Gulch in Jefferson County, Colorado. It was built in 1951, so it is 74 years old, older 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 31,000 vehicles a day, roughly 4% of them trucks, projected to reach 35,340 by 2040. The structure is 21 ft (6.4 m) long and 197 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesUS 6 Ml
CrossesLena Gulch
Location3.2 MI E of JCT SH 58
RouteU.S. Route 6G
Coordinates39.72499, -105.194
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.8 US tons
Inventory rating44.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width197 ft (60 m)
Roadway width91 ft (27.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31,000 (2020)
Projected traffic35,340 by 2040
Trucks4%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

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 US 6 Ml over Lena Gulch built?

It was built in 1951, making it 74 years old in 2025.

What condition is US 6 Ml over Lena Gulch 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 November 2023.

How much traffic does US 6 Ml over Lena Gulch carry?

About 31,000 vehicles per day (2020 count), of which roughly 4% are trucks.

How long is US 6 Ml over Lena Gulch?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m) and a deck 197 ft wide.

Who owns US 6 Ml over Lena Gulch?

It is owned by the State Highway Agency.