US Bridges

Kelly Toponce Road over Relief Channel

FairPosted for load

Caribou County, Idaho · 3.9 N. 5.2 W. Bancroft · Structure no. 000000000023220

Built
1964
61 years old
Condition
Fair
inspected April 2024
Type
Tee Beam
Prestressed Concrete
Length
33 ft
1 main span
Daily traffic
160
2023 count
Owner
County
County Highway Agency

About this bridge

Kelly Toponce Road over Relief Channel is a prestressed concrete tee beam carrying Kelly Toponce Road over Relief Channel in Caribou County, Idaho. It was built in 1964, so it is 61 years old, older 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 160 vehicles a day, roughly 14% of them trucks, projected to reach 240 by 2042. The structure is 33 ft (10.1 m) long and 28 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesKelly Toponce Road
CrossesRelief Channel
Location3.9 N. 5.2 W. Bancroft
RouteCounty Highway 0
CountyCaribou County
StateIdaho
Coordinates42.77564, -111.98672
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating30 US tons
Inventory rating18 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length33 ft (10.1 m)
Longest span31 ft (9.4 m)
Deck width28 ft (8.4 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$401,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Kelly Toponce Road over Relief Channel built?

It was built in 1964, making it 61 years old in 2025.

What condition is Kelly Toponce Road over Relief Channel 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 2024.

How much traffic does Kelly Toponce Road over Relief Channel carry?

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

How long is Kelly Toponce Road over Relief Channel?

The structure is 33 ft (10.1 m) long with a longest span of 31 ft (9.4 m) and a deck 28 ft wide.

Who owns Kelly Toponce Road over Relief Channel?

It is owned by the County Highway Agency.