US Bridges

Na Cnty RD 106 over South Fork Powder River

FairPosted for load

Natrona County, Wyoming · 3 Miles N. of Powder Rive · Structure no. DRE

Built
1979
46 years old
Condition
Fair
inspected August 2024
Type
Tee Beam
Prestressed Concrete
Length
131 ft
3 main spans
Daily traffic
20
2024 count
Owner
County
County Highway Agency

About this bridge

Na Cnty RD 106 over South Fork Powder River is a prestressed concrete tee beam carrying Na Cnty RD 106 over South Fork Powder River in Natrona County, Wyoming. It was built in 1979, so it is 46 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 20 vehicles a day, roughly 5% of them trucks, projected to reach 28 by 2043. The structure is 131 ft (39.9 m) long and 28 ft wide. If it were closed, the detour would be 36 mi (58 km).

CarriesNa Cnty RD 106
CrossesSouth Fork Powder River
Location3 Miles N. of Powder Rive
RouteCounty Highway 106
StateWyoming
Coordinates43.07469, -106.98839
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
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 alignment7: Better than present minimum criteria
Operating rating60.1 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length131 ft (39.9 m)
Longest span43 ft (13.1 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2024)
Projected traffic28 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed36 mi (58 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$62,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Na Cnty RD 106 over South Fork Powder River built?

It was built in 1979, making it 46 years old in 2025.

What condition is Na Cnty RD 106 over South Fork Powder 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 2024.

How much traffic does Na Cnty RD 106 over South Fork Powder River carry?

About 20 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Na Cnty RD 106 over South Fork Powder River?

The structure is 131 ft (39.9 m) long with a longest span of 43 ft (13.1 m) and a deck 28 ft wide.

Who owns Na Cnty RD 106 over South Fork Powder River?

It is owned by the County Highway Agency.