US Bridges

Na Cnty RD 407 over North Platte River

Fair

Natrona County, Wyoming · Alcova · Structure no. MZJ

Built
2019
6 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
360 ft
3 main spans
Daily traffic
64
2024 count
Owner
County
County Highway Agency

About this bridge

Na Cnty RD 407 over North Platte River is a steel continuous stringer/multi-beam or girder carrying Na Cnty RD 407 over North Platte River in Natrona County, Wyoming. It was built in 2019, so it is 6 years old, younger than the Wyoming average of 48.4 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 64 vehicles a day, roughly 6% of them trucks, projected to reach 90 by 2043. The structure is 360 ft (109.7 m) long and 35 ft wide. If it were closed, the detour would be 26.1 mi (42 km).

Location

Open in Google Maps
CarriesNa Cnty RD 407
CrossesNorth Platte River
LocationAlcova
RouteCounty Highway 407
CountyNatrona County
StateWyoming
Coordinates42.55079, -106.71702
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating50.7 US tons
Inventory rating38.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length360 ft (109.7 m)
Longest span140 ft (42.7 m)
Deck width35 ft (10.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic64 (2024)
Projected traffic90 by 2043
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed26.1 mi (42 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.6 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Na Cnty RD 407 over North Platte River built?

It was built in 2019, making it 6 years old in 2025.

What condition is Na Cnty RD 407 over North Platte River 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 August 2023.

How much traffic does Na Cnty RD 407 over North Platte River carry?

About 64 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is Na Cnty RD 407 over North Platte River?

The structure is 360 ft (109.7 m) long with a longest span of 140 ft (42.7 m) and a deck 35 ft wide.

Who owns Na Cnty RD 407 over North Platte River?

It is owned by the County Highway Agency.