US Bridges

SH121 Ml-Wadsworth over Dutch Creek

Fair

Jefferson County, Colorado · .2 Mi. S. of Coal Mine RD · Structure no. F-16-FV

Built
1965
60 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete
Length
25 ft
2 main spans
Daily traffic
29,000
2020 count
Owner
State
State Highway Agency

About this bridge

SH121 Ml-Wadsworth over Dutch Creek is a concrete culvert carrying SH121 Ml-Wadsworth over Dutch Creek in Jefferson County, Colorado. It was built in 1965, so it is 60 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 29,000 vehicles a day, roughly 3% of them trucks, projected to reach 31,030 by 2040. The structure is 25 ft (7.6 m) long and 201 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesSH121 Ml-Wadsworth
CrossesDutch Creek
Location.2 Mi. S. of Coal Mine RD
RouteState Highway 121A
Coordinates39.59299, -105.09121
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 inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span13 ft (4 m)
Deck width201 ft (61.3 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29,000 (2020)
Projected traffic31,030 by 2040
Trucks3%
Lanes on structure4
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 SH121 Ml-Wadsworth over Dutch Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is SH121 Ml-Wadsworth over Dutch Creek 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 SH121 Ml-Wadsworth over Dutch Creek carry?

About 29,000 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is SH121 Ml-Wadsworth over Dutch Creek?

The structure is 25 ft (7.6 m) long with a longest span of 13 ft (4 m) and a deck 201 ft wide.

Who owns SH121 Ml-Wadsworth over Dutch Creek?

It is owned by the State Highway Agency.