US Bridges

SH 75 over Gini Canal

Good

Custer County, Idaho · 2.4 S. Challis · Structure no. 000000000017820

Built
1988
37 years old
Condition
Good
inspected October 2023
Type
Frame
Concrete
Length
21 ft
1 main span
Daily traffic
1,100
2023 count
Owner
State
State Highway Agency

About this bridge

SH 75 over Gini Canal is a concrete frame carrying SH 75 over Gini Canal in Custer County, Idaho. It was built in 1988, so it is 37 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 1,100 vehicles a day, roughly 15% of them trucks, projected to reach 1,650 by 2042. The structure is 21 ft (6.4 m) long and 84 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesSH 75
CrossesGini Canal
Location2.4 S. Challis
RouteState Highway 75
StateIdaho
Coordinates44.47428, -114.21075
Functional classRural Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.9 US tons
Inventory rating37 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length21 ft (6.4 m)
Longest span21 ft (6.4 m)
Deck width84 ft (25.6 m)
Roadway width82 ft (25 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,100 (2023)
Projected traffic1,650 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 SH 75 over Gini Canal built?

It was built in 1988, making it 37 years old in 2025.

What condition is SH 75 over Gini Canal 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 October 2023.

How much traffic does SH 75 over Gini Canal carry?

About 1,100 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is SH 75 over Gini Canal?

The structure is 21 ft (6.4 m) long with a longest span of 21 ft (6.4 m) and a deck 84 ft wide.

Who owns SH 75 over Gini Canal?

It is owned by the State Highway Agency.