US Bridges

Road 20155 over Blacksmith Fork

Fair

Cache County, Utah · 7 M NW of Hardware Ranch · Structure no. 041907000001018

Built
1961
64 years old, rebuilt 2000
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
32 ft
1 main span
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

Road 20155 over Blacksmith Fork is a steel stringer/multi-beam or girder carrying Road 20155 over Blacksmith Fork in Cache County, Utah. It was built in 1961 and reconstructed in 2000, so it is 64 years old, older than the Utah average of 40.1 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.

It carries about 50 vehicles a day, projected to reach 75 by 2045. The structure is 32 ft (9.8 m) long and 15 ft wide.

Location

Open in Google Maps
CarriesRoad 20155
CrossesBlacksmith Fork
Location7 M NW of Hardware Ranch
RouteFederal Lands Road 20155
CountyCache County
StateUtah
Coordinates41.62868, -111.69299
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
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 alignment8: Equal to present desirable criteria
Operating rating28.2 US tons
Inventory rating21.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadH 20
Structure length32 ft (9.8 m)
Longest span28 ft (8.6 m)
Deck width15 ft (4.6 m)
Roadway width14 ft (4.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (—)
Projected traffic75 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Road 20155 over Blacksmith Fork built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 2000.

What condition is Road 20155 over Blacksmith Fork 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 September 2023.

How much traffic does Road 20155 over Blacksmith Fork carry?

About 50 vehicles per day (latest count).

How long is Road 20155 over Blacksmith Fork?

The structure is 32 ft (9.8 m) long with a longest span of 28 ft (8.6 m) and a deck 15 ft wide.

Who owns Road 20155 over Blacksmith Fork?

It is owned by the U.S. Forest Service.