US Bridges

Fs Route No. 456A over N.F. ST Joe River

Poor

Shoshone County, Idaho · Loop Creek · Structure no. 010402000001056

Built
1935
90 years old
Condition
Poor
inspected August 2022
Type
Truss - Thru
Steel
Length
119 ft
1 main span
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

Fs Route No. 456A over N.F. ST Joe River is a steel truss - thru carrying Fs Route No. 456A over N.F. ST Joe River in Shoshone County, Idaho. It was built in 1935, so it is 90 years old, older than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 50 vehicles a day, projected to reach 75 by 2045. The structure is 119 ft (36.3 m) long and 13 ft wide. If it were closed, the detour would be 620.7 mi (999 km).

Location

Open in Google Maps
CarriesFs Route No. 456A
CrossesN.F. ST Joe River
LocationLoop Creek
RouteFederal Lands Road 1997D
CountyShoshone County
StateIdaho
Coordinates47.33692, -115.75184
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2022
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating30 US tons
Inventory rating22.8 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1 (+2 approach)
Design loadH 20
Structure length119 ft (36.3 m)
Longest span81 ft (24.7 m)
Deck width13 ft (4.1 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (—)
Projected traffic75 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed620.7 mi (999 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Fs Route No. 456A over N.F. ST Joe River built?

It was built in 1935, making it 90 years old in 2025.

What condition is Fs Route No. 456A over N.F. ST Joe River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2022.

How much traffic does Fs Route No. 456A over N.F. ST Joe River carry?

About 50 vehicles per day (latest count).

How long is Fs Route No. 456A over N.F. ST Joe River?

The structure is 119 ft (36.3 m) long with a longest span of 81 ft (24.7 m) and a deck 13 ft wide.

Who owns Fs Route No. 456A over N.F. ST Joe River?

It is owned by the U.S. Forest Service.