US Bridges

Na Cnty RD 403 over Bolton Creek

Fair

Natrona County, Wyoming · 20 Mi. S.W. of Casper · Structure no. KFX

Built
1994
31 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
60 ft
1 main span
Daily traffic
2
2024 count
Owner
County
County Highway Agency

About this bridge

Na Cnty RD 403 over Bolton Creek is a steel stringer/multi-beam or girder carrying Na Cnty RD 403 over Bolton Creek in Natrona 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 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 2 vehicles a day, projected to reach 3 by 2043. The structure is 60 ft (18.3 m) long and 14 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesNa Cnty RD 403
CrossesBolton Creek
Location20 Mi. S.W. of Casper
RouteCounty Highway 403
CountyNatrona County
StateWyoming
Coordinates42.61171, -106.55005
Functional classRural Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
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 rating81 US tons
Inventory rating48 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length60 ft (18.3 m)
Longest span60 ft (18.2 m)
Deck width14 ft (4.3 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2 (2024)
Projected traffic3 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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$45,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Na Cnty RD 403 over Bolton Creek built?

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

What condition is Na Cnty RD 403 over Bolton Creek 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 403 over Bolton Creek carry?

About 2 vehicles per day (2024 count).

How long is Na Cnty RD 403 over Bolton Creek?

The structure is 60 ft (18.3 m) long with a longest span of 60 ft (18.2 m) and a deck 14 ft wide.

Who owns Na Cnty RD 403 over Bolton Creek?

It is owned by the County Highway Agency.