US Bridges

Kelsey (r.Snk CK1) over Rattlesnake Creek (#1)

Good

Lemhi County, Idaho · 16.4 S. 3.1 W. Salmon · Structure no. 000000000032748

Built
2018
7 years old
Condition
Good
inspected April 2021
Type
Stringer/Multi-beam or Girder
Steel
Length
33 ft
1 main span
Daily traffic
3
2023 count
Owner
County
County Highway Agency

About this bridge

Kelsey (r.Snk CK1) over Rattlesnake Creek (#1) is a steel stringer/multi-beam or girder carrying Kelsey (r.Snk CK1) over Rattlesnake Creek (#1) in Lemhi County, Idaho. It was built in 2018, so it is 7 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3 vehicles a day, projected to reach 5 by 2039. The structure is 33 ft (10.1 m) long and 18 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesKelsey (r.Snk CK1)
CrossesRattlesnake Creek (#1)
Location16.4 S. 3.1 W. Salmon
RouteCounty Highway 0
CountyLemhi County
StateIdaho
Coordinates44.93864, -113.96447
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
Deck8 Very GoodNo problems noted.
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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating56.4 US tons
Inventory rating43.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHL 93
Structure length33 ft (10.1 m)
Longest span32 ft (9.8 m)
Deck width18 ft (5.6 m)
Roadway width17 ft (5.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3 (2023)
Projected traffic5 by 2039
Trucks0%
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

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 Kelsey (r.Snk CK1) over Rattlesnake Creek (#1) built?

It was built in 2018, making it 7 years old in 2025.

What condition is Kelsey (r.Snk CK1) over Rattlesnake Creek (#1) 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 April 2021.

How much traffic does Kelsey (r.Snk CK1) over Rattlesnake Creek (#1) carry?

About 3 vehicles per day (2023 count).

How long is Kelsey (r.Snk CK1) over Rattlesnake Creek (#1)?

The structure is 33 ft (10.1 m) long with a longest span of 32 ft (9.8 m) and a deck 18 ft wide.

Who owns Kelsey (r.Snk CK1) over Rattlesnake Creek (#1)?

It is owned by the County Highway Agency.