US Bridges

STC1762;PRTNEUF RD over Portneuf R;ft Hall Mine

Fair

Bannock County, Idaho · 0.2 N. 5.8 W. Inkom · Structure no. 000000000019145

Built
1983
42 years old
Condition
Fair
inspected April 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
86 ft
1 main span
Daily traffic
2,000
2023 count
Owner
County
County Highway Agency

About this bridge

STC1762;PRTNEUF RD over Portneuf R;ft Hall Mine is a prestressed concrete box beam or girders - multiple carrying STC1762;PRTNEUF RD over Portneuf R;ft Hall Mine in Bannock County, Idaho. It was built in 1983, so it is 42 years old, younger than the Idaho average of 45.3 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 2,000 vehicles a day, roughly 11% of them trucks, projected to reach 3,000 by 2042. The structure is 86 ft (26.2 m) long and 40 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSTC1762;PRTNEUF RD
CrossesPortneuf R;ft Hall Mine
Location0.2 N. 5.8 W. Inkom
RouteCounty Highway 1762
CountyBannock County
StateIdaho
Coordinates42.79542, -112.36367
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70 US tons
Inventory rating20 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length86 ft (26.2 m)
Longest span83 ft (25.3 m)
Deck width40 ft (12.3 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,000 (2023)
Projected traffic3,000 by 2042
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$750,000
NavigationNo navigation control on waterway

Frequently asked questions

When was STC1762;PRTNEUF RD over Portneuf R;ft Hall Mine built?

It was built in 1983, making it 42 years old in 2025.

What condition is STC1762;PRTNEUF RD over Portneuf R;ft Hall Mine 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 April 2023.

How much traffic does STC1762;PRTNEUF RD over Portneuf R;ft Hall Mine carry?

About 2,000 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is STC1762;PRTNEUF RD over Portneuf R;ft Hall Mine?

The structure is 86 ft (26.2 m) long with a longest span of 83 ft (25.3 m) and a deck 40 ft wide.

Who owns STC1762;PRTNEUF RD over Portneuf R;ft Hall Mine?

It is owned by the County Highway Agency.