US Bridges

Lower Gem Hill RD over Canyon Creek;gem Br

Good

Shoshone County, Idaho · 0.1 S. 0.1 E.Gem · Structure no. 000000000030831

Built
2023
2 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
70 ft
1 main span
Daily traffic
50
2023 count
Owner
County
County Highway Agency

About this bridge

Lower Gem Hill RD over Canyon Creek;gem Br is a steel stringer/multi-beam or girder carrying Lower Gem Hill RD over Canyon Creek;gem Br in Shoshone County, Idaho. It was built in 2023, so it is 2 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 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 50 vehicles a day, roughly 10% of them trucks, projected to reach 75 by 2042. The structure is 70 ft (21.3 m) long and 18 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesLower Gem Hill RD
CrossesCanyon Creek;gem Br
Location0.1 S. 0.1 E.Gem
RouteCounty Highway 0
StateIdaho
Coordinates47.50825, -115.86761
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating47.2 US tons
Inventory rating36.4 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHL 93
Structure length70 ft (21.3 m)
Longest span67 ft (20.4 m)
Deck width18 ft (5.5 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic75 by 2042
Trucks10%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Lower Gem Hill RD over Canyon Creek;gem Br built?

It was built in 2023, making it 2 years old in 2025.

What condition is Lower Gem Hill RD over Canyon Creek;gem Br 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 Lower Gem Hill RD over Canyon Creek;gem Br carry?

About 50 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Lower Gem Hill RD over Canyon Creek;gem Br?

The structure is 70 ft (21.3 m) long with a longest span of 67 ft (20.4 m) and a deck 18 ft wide.

Who owns Lower Gem Hill RD over Canyon Creek;gem Br?

It is owned by the County Highway Agency.