US Bridges

Na Cnty RD 410 over Sweetwater River

FairPosted for load

Natrona County, Wyoming · 43 Miles S.W. of Casper · Structure no. FCY

Built
1984
41 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
129 ft
3 main spans
Daily traffic
11
2024 count
Owner
County
County Highway Agency

About this bridge

Na Cnty RD 410 over Sweetwater River is a steel continuous stringer/multi-beam or girder carrying Na Cnty RD 410 over Sweetwater River in Natrona County, Wyoming. It was built in 1984, so it is 41 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. Its operating status is: posted for load restriction.

It carries about 11 vehicles a day, roughly 9% of them trucks, projected to reach 15 by 2043. The structure is 129 ft (39.3 m) long and 28 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesNa Cnty RD 410
CrossesSweetwater River
Location43 Miles S.W. of Casper
RouteCounty Highway 410
CountyNatrona County
StateWyoming
Coordinates42.50633, -107.06156
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
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 rating64 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, precast panels
Main spans3
Design loadUnknown
Structure length129 ft (39.3 m)
Longest span51 ft (15.5 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11 (2024)
Projected traffic15 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-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$59,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Na Cnty RD 410 over Sweetwater River built?

It was built in 1984, making it 41 years old in 2025.

What condition is Na Cnty RD 410 over Sweetwater 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 410 over Sweetwater River carry?

About 11 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is Na Cnty RD 410 over Sweetwater River?

The structure is 129 ft (39.3 m) long with a longest span of 51 ft (15.5 m) and a deck 28 ft wide.

Who owns Na Cnty RD 410 over Sweetwater River?

It is owned by the County Highway Agency.