US Bridges

Ni Cnty RD 50 over Lightning Creek

Good

Niobrara County, Wyoming · Kaye Field Road · Structure no. KHV

Built
1994
31 years old
Condition
Good
inspected October 2023
Type
Tee Beam
Prestressed Concrete
Length
55 ft
1 main span
Daily traffic
25
2024 count
Owner
County
County Highway Agency

About this bridge

Ni Cnty RD 50 over Lightning Creek is a prestressed concrete tee beam carrying Ni Cnty RD 50 over Lightning Creek in Niobrara County, Wyoming. It was built in 1994, so it is 31 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.

It carries about 25 vehicles a day, roughly 12% of them trucks, projected to reach 35 by 2043. The structure is 55 ft (16.8 m) long and 28 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

CarriesNi Cnty RD 50
CrossesLightning Creek
LocationKaye Field Road
RouteCounty Highway 50
StateWyoming
Coordinates43.16078, -104.8614
Functional classRural Minor Collector

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating75 US tons
Inventory rating45 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length55 ft (16.8 m)
Longest span53 ft (16.1 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2024)
Projected traffic35 by 2043
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 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 Ni Cnty RD 50 over Lightning Creek built?

It was built in 1994, making it 31 years old in 2025.

What condition is Ni Cnty RD 50 over Lightning 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 October 2023.

How much traffic does Ni Cnty RD 50 over Lightning Creek carry?

About 25 vehicles per day (2024 count), of which roughly 12% are trucks.

How long is Ni Cnty RD 50 over Lightning Creek?

The structure is 55 ft (16.8 m) long with a longest span of 53 ft (16.1 m) and a deck 28 ft wide.

Who owns Ni Cnty RD 50 over Lightning Creek?

It is owned by the County Highway Agency.