US Bridges

SH 391 Ml over Lena Gulch

Fair

Jefferson County, Colorado · N Side of 39th Ave · Structure no. E-16-IX

Built
1981
44 years old
Condition
Fair
inspected January 2024
Type
Culvert
Concrete
Length
43 ft
3 main spans
Daily traffic
37,000
2020 count
Owner
State
State Highway Agency

About this bridge

SH 391 Ml over Lena Gulch is a concrete culvert carrying SH 391 Ml over Lena Gulch in Jefferson County, Colorado. It was built in 1981, so it is 44 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 5 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 37,000 vehicles a day, roughly 3% of them trucks, projected to reach 39,960 by 2040. The structure is 43 ft (13.2 m) long and 101 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesSH 391 Ml
CrossesLena Gulch
LocationN Side of 39th Ave
RouteState Highway 391A
Coordinates39.77147, -105.10952
Functional classUrban Other Principal 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
Channel and channel protection7 GoodSome minor problems.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating103.4 US tons
Inventory rating61.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length43 ft (13.2 m)
Longest span12 ft (3.8 m)
Deck width101 ft (30.8 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic37,000 (2020)
Projected traffic39,960 by 2040
Trucks3%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 SH 391 Ml over Lena Gulch built?

It was built in 1981, making it 44 years old in 2025.

What condition is SH 391 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 January 2024.

How much traffic does SH 391 Ml over Lena Gulch carry?

About 37,000 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is SH 391 Ml over Lena Gulch?

The structure is 43 ft (13.2 m) long with a longest span of 12 ft (3.8 m) and a deck 101 ft wide.

Who owns SH 391 Ml over Lena Gulch?

It is owned by the State Highway Agency.