US Bridges

US 36 Ml over W. Plum Bush Crk

Fair

Washington County, Colorado · 1 MI W of Last Chance · Structure no. F-22-B

Built
1938
87 years old
Condition
Fair
inspected March 2025
Type
Frame
Concrete
Length
72 ft
1 main span
Daily traffic
560
2020 count
Owner
State
State Highway Agency

About this bridge

US 36 Ml over W. Plum Bush Crk is a concrete frame carrying US 36 Ml over W. Plum Bush Crk in Washington County, Colorado. It was built in 1938, so it is 87 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 560 vehicles a day, roughly 37% of them trucks, projected to reach 661 by 2040. The structure is 72 ft (22 m) long and 33 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesUS 36 Ml
CrossesW. Plum Bush Crk
Location1 MI W of Last Chance
RouteU.S. Route 36D
Coordinates39.73995, -103.61203
Functional classRural Minor 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2025
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.1 US tons
Inventory rating23 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length72 ft (22 m)
Longest span58 ft (17.8 m)
Deck width33 ft (10.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic560 (2020)
Projected traffic661 by 2040
Trucks37%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 36 Ml over W. Plum Bush Crk built?

It was built in 1938, making it 87 years old in 2025.

What condition is US 36 Ml over W. Plum Bush Crk 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 March 2025.

How much traffic does US 36 Ml over W. Plum Bush Crk carry?

About 560 vehicles per day (2020 count), of which roughly 37% are trucks.

How long is US 36 Ml over W. Plum Bush Crk?

The structure is 72 ft (22 m) long with a longest span of 58 ft (17.8 m) and a deck 33 ft wide.

Who owns US 36 Ml over W. Plum Bush Crk?

It is owned by the State Highway Agency.