US Bridges

CO Cnty RD 21 over North Platte River

GoodPosted for load

Converse County, Wyoming · 10 Miles West of Glenrock · Structure no. MVX

Built
2013
12 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
302 ft
6 main spans
Daily traffic
43
2024 count
Owner
County
County Highway Agency

About this bridge

CO Cnty RD 21 over North Platte River is a steel stringer/multi-beam or girder carrying CO Cnty RD 21 over North Platte River in Converse County, Wyoming. It was built in 2013, so it is 12 years old, younger than the Wyoming average of 48.4 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. Its operating status is: posted for load restriction.

It carries about 43 vehicles a day, roughly 7% of them trucks, projected to reach 60 by 2043. The structure is 302 ft (91.9 m) long and 16 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesCO Cnty RD 21
CrossesNorth Platte River
Location10 Miles West of Glenrock
RouteCounty Highway 21
StateWyoming
Coordinates42.86802, -106.04943
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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating37.1 US tons
Inventory rating28.5 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans6
Design loadHL 93
Structure length302 ft (91.9 m)
Longest span49 ft (15 m)
Deck width16 ft (4.9 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic43 (2024)
Projected traffic60 by 2043
Trucks7%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$95,000
NavigationNo navigation control on waterway

Frequently asked questions

When was CO Cnty RD 21 over North Platte River built?

It was built in 2013, making it 12 years old in 2025.

What condition is CO Cnty RD 21 over North Platte River 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 September 2023.

How much traffic does CO Cnty RD 21 over North Platte River carry?

About 43 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is CO Cnty RD 21 over North Platte River?

The structure is 302 ft (91.9 m) long with a longest span of 49 ft (15 m) and a deck 16 ft wide.

Who owns CO Cnty RD 21 over North Platte River?

It is owned by the County Highway Agency.