US Bridges

SR-101 over Blacksmith Fork River

Fair

Cache County, Utah · 1.7 Mile E. of Hyrum · Structure no. 0D 626

Built
1959
66 years old
Condition
Fair
inspected July 2023
Type
Frame
Concrete
Length
33 ft
1 main span
Daily traffic
3,638
2022 count
Owner
State
State Highway Agency

About this bridge

SR-101 over Blacksmith Fork River is a concrete frame 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 3,638 vehicles a day, roughly 22% of them trucks, projected to reach 4,366 by 2042. The structure is 33 ft (10.1 m) long and 34 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesSR-101
CrossesBlacksmith Fork River
Location1.7 Mile E. of Hyrum
RouteState Highway 101
CountyCache County
StateUtah
Coordinates41.62719, -111.80182
Functional classUrban 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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.7 US tons
Inventory rating26.5 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length33 ft (10.1 m)
Longest span30 ft (9.1 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,638 (2022)
Projected traffic4,366 by 2042
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 3,638 vehicles per day (2022 count), of which roughly 22% are trucks.

How long is SR-101 over Blacksmith Fork River?

The structure is 33 ft (10.1 m) long with a longest span of 30 ft (9.1 m) and a deck 34 ft wide.

Who owns SR-101 over Blacksmith Fork River?

It is owned by the State Highway Agency.