US Bridges

Kelly Toponce Road over Portneuf River

Fair

Caribou County, Idaho · 4.7 N. 4.8 W. Bancroft · Structure no. 000000000023241

Built
2008
17 years old
Condition
Fair
inspected April 2021
Type
Stringer/Multi-beam or Girder
Concrete
Length
70 ft
1 main span
Daily traffic
160
2023 count
Owner
County
County Highway Agency

About this bridge

Kelly Toponce Road over Portneuf River is a concrete stringer/multi-beam or girder carrying Kelly Toponce Road over Portneuf River in Caribou County, Idaho. It was built in 2008, so it is 17 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 160 vehicles a day, roughly 14% of them trucks, projected to reach 240 by 2042. The structure is 70 ft (21.3 m) long and 30 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesKelly Toponce Road
CrossesPortneuf River
Location4.7 N. 4.8 W. Bancroft
RouteCounty Highway 0
CountyCaribou County
StateIdaho
Coordinates42.78722, -111.97917
Functional classRural Minor 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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating65 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length70 ft (21.3 m)
Longest span66 ft (20.1 m)
Deck width30 ft (9 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic160 (2023)
Projected traffic240 by 2042
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Kelly Toponce Road over Portneuf River built?

It was built in 2008, making it 17 years old in 2025.

What condition is Kelly Toponce Road over Portneuf 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 April 2021.

How much traffic does Kelly Toponce Road over Portneuf River carry?

About 160 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is Kelly Toponce Road over Portneuf River?

The structure is 70 ft (21.3 m) long with a longest span of 66 ft (20.1 m) and a deck 30 ft wide.

Who owns Kelly Toponce Road over Portneuf River?

It is owned by the County Highway Agency.