US Bridges

I-25 Service Road over South Fork Powder River

FairPosted for load

Johnson County, Wyoming · Wyo 387 JCT - Buffalo · Structure no. AJX

Built
1932
93 years old
Condition
Fair
inspected May 2023
Type
Truss - Deck
Steel Continuous
Length
309 ft
3 main spans
Daily traffic
79
2024 count
Owner
State
State Highway Agency

About this bridge

I-25 Service Road over South Fork Powder River is a steel continuous truss - deck carrying I-25 Service Road over South Fork Powder River in Johnson County, Wyoming. It was built in 1932, so it is 93 years old, older 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 5 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 79 vehicles a day, roughly 28% of them trucks, projected to reach 111 by 2043. The structure is 309 ft (94.1 m) long and 22 ft wide.

Location

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CarriesI-25 Service Road
CrossesSouth Fork Powder River
LocationWyo 387 JCT - Buffalo
CountyJohnson County
StateWyoming
Coordinates43.6201, -106.57639
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating40.3 US tons
Inventory rating23.8 US tons

Structure

Structure typeTruss - Deck
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length309 ft (94.1 m)
Longest span144 ft (43.9 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic79 (2024)
Projected traffic111 by 2043
Trucks28%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$855,000
NavigationNo navigation control on waterway

Frequently asked questions

When was I-25 Service Road over South Fork Powder River built?

It was built in 1932, making it 93 years old in 2025.

What condition is I-25 Service Road 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 May 2023.

How much traffic does I-25 Service Road over South Fork Powder River carry?

About 79 vehicles per day (2024 count), of which roughly 28% are trucks.

How long is I-25 Service Road over South Fork Powder River?

The structure is 309 ft (94.1 m) long with a longest span of 144 ft (43.9 m) and a deck 22 ft wide.

Who owns I-25 Service Road over South Fork Powder River?

It is owned by the State Highway Agency.