US Bridges

Old Highway 95 over Slate Creek

FairPosted for load

Idaho County, Idaho · 0.2 N. Slate Creek R.Sta · Structure no. 000000000029145

Built
1920
105 years old
Condition
Fair
inspected June 2024
Type
Truss - Thru
Steel
Length
74 ft
1 main span
Daily traffic
50
2023 count
Owner
County
County Highway Agency

About this bridge

Old Highway 95 over Slate Creek is a steel truss - thru carrying Old Highway 95 over Slate Creek in Idaho County, Idaho. It was built in 1920, so it is 105 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 50 vehicles a day, roughly 10% of them trucks, projected to reach 75 by 2039. The structure is 74 ft (22.6 m) long and 18 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesOld Highway 95
CrossesSlate Creek
Location0.2 N. Slate Creek R.Sta
RouteCounty Highway 0
CountyIdaho County
StateIdaho
Coordinates45.64002, -116.28021
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating21.1 US tons
Inventory rating12 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length74 ft (22.6 m)
Longest span68 ft (20.7 m)
Deck width18 ft (5.5 m)
Roadway width16 ft (5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic75 by 2039
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
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$665,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Old Highway 95 over Slate Creek built?

It was built in 1920, making it 105 years old in 2025.

What condition is Old Highway 95 over Slate Creek 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 2024.

How much traffic does Old Highway 95 over Slate Creek carry?

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

How long is Old Highway 95 over Slate Creek?

The structure is 74 ft (22.6 m) long with a longest span of 68 ft (20.7 m) and a deck 18 ft wide.

Who owns Old Highway 95 over Slate Creek?

It is owned by the County Highway Agency.