US Bridges

Island Park Access over Salmon River (island Br)

Good

Lemhi County, Idaho · In Salmon;island Park · Structure no. 000000000032771

Built
2016
9 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
80 ft
1 main span
Daily traffic
120
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Island Park Access over Salmon River (island Br) is a steel stringer/multi-beam or girder carrying Island Park Access over Salmon River (island Br) in Lemhi County, Idaho. It was built in 2016, so it is 9 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 120 vehicles a day, roughly 5% of them trucks, projected to reach 180 by 2039. The structure is 80 ft (24.4 m) long and 18 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesIsland Park Access
CrossesSalmon River (island Br)
LocationIn Salmon;island Park
RouteCity Street 0
CountyLemhi County
StateIdaho
Coordinates45.17728, -113.89897
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 2023
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating46.7 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHL 93
Structure length80 ft (24.4 m)
Longest span79 ft (24.1 m)
Deck width18 ft (5.5 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic120 (2023)
Projected traffic180 by 2039
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$697,000 (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Island Park Access over Salmon River (island Br) built?

It was built in 2016, making it 9 years old in 2025.

What condition is Island Park Access over Salmon River (island 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 April 2023.

How much traffic does Island Park Access over Salmon River (island Br) carry?

About 120 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Island Park Access over Salmon River (island Br)?

The structure is 80 ft (24.4 m) long with a longest span of 79 ft (24.1 m) and a deck 18 ft wide.

Who owns Island Park Access over Salmon River (island Br)?

It is owned by the City or Municipal Highway Agency.