US Bridges

SR-101 over Blacksmith Fork River

Fair

Cache County, Utah · 3.6 Miles East of Hyrum · Structure no. 0E1141

Built
1959
66 years old
Condition
Fair
inspected July 2023
Type
Culvert
Concrete
Length
36 ft
1 main span
Daily traffic
424
2017 count
Owner
State
State Highway Agency

About this bridge

SR-101 over Blacksmith Fork River is a concrete culvert carrying SR-101 over Blacksmith Fork River in Cache County, Utah. It was built in 1959, so it is 66 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 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 424 vehicles a day, roughly 22% of them trucks, projected to reach 509 by 2037. The structure is 36 ft (11.1 m) long and 43 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesSR-101
CrossesBlacksmith Fork River
Location3.6 Miles East of Hyrum
RouteState Highway 101
CountyCache County
StateUtah
Coordinates41.62071, -111.77098
Functional classRural Major 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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.5 US tons
Inventory rating34.3 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 15
Structure length36 ft (11.1 m)
Longest span32 ft (9.7 m)
Deck width43 ft (13 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic424 (2017)
Projected traffic509 by 2037
Trucks22%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR-101 over Blacksmith Fork River built?

It was built in 1959, making it 66 years old in 2025.

What condition is SR-101 over Blacksmith Fork 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 July 2023.

How much traffic does SR-101 over Blacksmith Fork River carry?

About 424 vehicles per day (2017 count), of which roughly 22% are trucks.

How long is SR-101 over Blacksmith Fork River?

The structure is 36 ft (11.1 m) long with a longest span of 32 ft (9.7 m) and a deck 43 ft wide.

Who owns SR-101 over Blacksmith Fork River?

It is owned by the State Highway Agency.