US Bridges

SH 121 Ml over Mcintire Gulch

Fair

Jefferson County, Colorado · .2 Mi. N. of 6th Ave. · Structure no. F-16-YU

Built
2018
7 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete
Length
73 ft
4 main spans
Daily traffic
47,000
2020 count
Owner
State
State Highway Agency

About this bridge

SH 121 Ml over Mcintire Gulch is a concrete culvert carrying SH 121 Ml over Mcintire Gulch in Jefferson County, Colorado. It was built in 2018, so it is 7 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 47,000 vehicles a day, roughly 3% of them trucks, projected to reach 50,290 by 2040. The structure is 73 ft (22.1 m) long and 138 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesSH 121 Ml
CrossesMcintire Gulch
Location.2 Mi. N. of 6th Ave.
RouteState Highway 121A
Coordinates39.72876, -105.08119
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.
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 geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.8 US tons
Inventory rating60 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadHL 93
Structure length73 ft (22.1 m)
Longest span18 ft (5.5 m)
Deck width138 ft (42.1 m)
Roadway width136 ft (41.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic47,000 (2020)
Projected traffic50,290 by 2040
Trucks3%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 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 121 Ml over Mcintire Gulch built?

It was built in 2018, making it 7 years old in 2025.

What condition is SH 121 Ml over Mcintire 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 2025.

How much traffic does SH 121 Ml over Mcintire Gulch carry?

About 47,000 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is SH 121 Ml over Mcintire Gulch?

The structure is 73 ft (22.1 m) long with a longest span of 18 ft (5.5 m) and a deck 138 ft wide.

Who owns SH 121 Ml over Mcintire Gulch?

It is owned by the State Highway Agency.