US Bridges

Stc 1775;TURNER RD over Pacificorp Penstock

Good

Caribou County, Idaho · 0.1 W Grace · Structure no. 000000000019176

Built
2016
9 years old
Condition
Good
inspected April 2022
Type
Slab
Prestressed Concrete
Length
77 ft
1 main span
Daily traffic
520
2023 count
Owner
County
County Highway Agency

About this bridge

Stc 1775;TURNER RD over Pacificorp Penstock is a prestressed concrete slab carrying Stc 1775;TURNER RD over Pacificorp Penstock in Caribou County, Idaho. It was built in 2016, so it is 9 years old, younger than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 520 vehicles a day, roughly 11% of them trucks, projected to reach 780 by 2042. The structure is 77 ft (23.5 m) long and 36 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesStc 1775;TURNER RD
CrossesPacificorp Penstock
Location0.1 W Grace
RouteCounty Highway 1775
CountyCaribou County
StateIdaho
Coordinates42.57653, -111.74292
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.9 US tons
Inventory rating38.9 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length77 ft (23.5 m)
Longest span69 ft (20.9 m)
Deck width36 ft (11 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic520 (2023)
Projected traffic780 by 2042
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
Detour if closed3.7 mi (6 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Stc 1775;TURNER RD over Pacificorp Penstock built?

It was built in 2016, making it 9 years old in 2025.

What condition is Stc 1775;TURNER RD over Pacificorp Penstock in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2022.

How much traffic does Stc 1775;TURNER RD over Pacificorp Penstock carry?

About 520 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is Stc 1775;TURNER RD over Pacificorp Penstock?

The structure is 77 ft (23.5 m) long with a longest span of 69 ft (20.9 m) and a deck 36 ft wide.

Who owns Stc 1775;TURNER RD over Pacificorp Penstock?

It is owned by the County Highway Agency.