US Bridges

US 6 Ml over UP RR

Fair

Adams County, Colorado · In Commerce City · Structure no. E-17-CB

Built
1950
75 years old, rebuilt 1987
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
152 ft
3 main spans
Daily traffic
40,000
2020 count
Owner
State
State Highway Agency

About this bridge

US 6 Ml over UP RR is a steel continuous stringer/multi-beam or girder carrying US 6 Ml over UP RR in Adams County, Colorado. It was built in 1950 and reconstructed in 1987, so it is 75 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 40,000 vehicles a day, roughly 8% of them trucks, projected to reach 44,400 by 2040. The structure is 152 ft (46.3 m) long and 110 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesUS 6 Ml
CrossesUP RR
LocationIn Commerce City
RouteU.S. Route 6H
CountyAdams County
StateColorado
Coordinates39.79463, -104.93792
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.5 US tons
Inventory rating39.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length152 ft (46.3 m)
Longest span57 ft (17.4 m)
Deck width110 ft (33.5 m)
Roadway width80 ft (24.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40,000 (2020)
Projected traffic44,400 by 2040
Trucks8%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 6 Ml over UP RR built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1987.

What condition is US 6 Ml over UP RR 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 June 2024.

How much traffic does US 6 Ml over UP RR carry?

About 40,000 vehicles per day (2020 count), of which roughly 8% are trucks.

How long is US 6 Ml over UP RR?

The structure is 152 ft (46.3 m) long with a longest span of 57 ft (17.4 m) and a deck 110 ft wide.

Who owns US 6 Ml over UP RR?

It is owned by the State Highway Agency.