US Bridges

County Road 21 over Middle Plum Creek

Good

Prowers County, Colorado · .5 MI S of CR N · Structure no. PR21-20-11-104A

Built
1999
26 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
60 ft
1 main span
Daily traffic
28
2022 count
Owner
County
County Highway Agency

About this bridge

County Road 21 over Middle Plum Creek is a steel stringer/multi-beam or girder carrying County Road 21 over Middle Plum Creek in Prowers County, Colorado. It was built in 1999, so it is 26 years old, younger than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 28 vehicles a day, projected to reach 34 by 2042. The structure is 60 ft (18.2 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesCounty Road 21
CrossesMiddle Plum Creek
Location.5 MI S of CR N
RouteCounty Highway 0
Coordinates37.81684, -102.38323
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating64 US tons
Inventory rating38.3 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length60 ft (18.2 m)
Longest span56 ft (17.2 m)
Deck width31 ft (9.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28 (2022)
Projected traffic34 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 County Road 21 over Middle Plum Creek built?

It was built in 1999, making it 26 years old in 2025.

What condition is County Road 21 over Middle Plum Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2023.

How much traffic does County Road 21 over Middle Plum Creek carry?

About 28 vehicles per day (2022 count).

How long is County Road 21 over Middle Plum Creek?

The structure is 60 ft (18.2 m) long with a longest span of 56 ft (17.2 m) and a deck 31 ft wide.

Who owns County Road 21 over Middle Plum Creek?

It is owned by the County Highway Agency.