US Bridges

Mingo Road over Bench Canal

FairPosted for load

Caribou County, Idaho · 0.2 N. 0.2 E. Grace · Structure no. 000000000023228

Built
2012
13 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
43 ft
1 main span
Daily traffic
30
2023 count
Owner
County
County Highway Agency

About this bridge

Mingo Road over Bench Canal is a steel stringer/multi-beam or girder carrying Mingo Road over Bench Canal in Caribou County, Idaho. It was built in 2012, so it is 13 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. Its operating status is: posted for load restriction.

It carries about 30 vehicles a day, roughly 15% of them trucks, projected to reach 45 by 2039. The structure is 43 ft (13 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesMingo Road
CrossesBench Canal
Location0.2 N. 0.2 E. Grace
RouteCounty Highway 0
CountyCaribou County
StateIdaho
Coordinates42.58381, -111.72664
Functional classRural Local

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 protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating21.1 US tons
Inventory rating12 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length43 ft (13 m)
Longest span38 ft (11.7 m)
Deck width31 ft (9.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2023)
Projected traffic45 by 2039
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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$480,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mingo Road over Bench Canal built?

It was built in 2012, making it 13 years old in 2025.

What condition is Mingo Road over Bench Canal 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 September 2023.

How much traffic does Mingo Road over Bench Canal carry?

About 30 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is Mingo Road over Bench Canal?

The structure is 43 ft (13 m) long with a longest span of 38 ft (11.7 m) and a deck 31 ft wide.

Who owns Mingo Road over Bench Canal?

It is owned by the County Highway Agency.