US Bridges

N Side Road over ST Joe R;marble Creek Br

Fair

Shoshone County, Idaho · 1.7 S. 7.7 E. Calder · Structure no. 000000000030685

Built
1968
57 years old
Condition
Fair
inspected June 2023
Type
Truss - Thru
Steel
Length
257 ft
1 main span
Daily traffic
80
2023 count
Owner
County
County Highway Agency

About this bridge

N Side Road over ST Joe R;marble Creek Br is a steel truss - thru carrying N Side Road over ST Joe R;marble Creek Br in Shoshone County, Idaho. It was built in 1968, so it is 57 years old, older than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 80 vehicles a day, roughly 14% of them trucks, projected to reach 120 by 2042. The structure is 257 ft (78.3 m) long and 21 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesN Side Road
CrossesST Joe R;marble Creek Br
Location1.7 S. 7.7 E. Calder
RouteCounty Highway 0
CountyShoshone County
StateIdaho
Coordinates47.25149, -116.02776
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating44 US tons
Inventory rating26 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadHS 20
Structure length257 ft (78.3 m)
Longest span250 ft (76.2 m)
Deck width21 ft (6.3 m)
Roadway width13 ft (4.1 m)
Vertical clearance over deck15 ft (4.6 m)

Traffic and service

Average daily traffic80 (2023)
Projected traffic120 by 2042
Trucks14%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.2 million (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was N Side Road over ST Joe R;marble Creek Br built?

It was built in 1968, making it 57 years old in 2025.

What condition is N Side Road over ST Joe R;marble Creek Br in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2023.

How much traffic does N Side Road over ST Joe R;marble Creek Br carry?

About 80 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is N Side Road over ST Joe R;marble Creek Br?

The structure is 257 ft (78.3 m) long with a longest span of 250 ft (76.2 m) and a deck 21 ft wide.

Who owns N Side Road over ST Joe R;marble Creek Br?

It is owned by the County Highway Agency.