US Bridges

Sperry Grade RD over Potlatch Rvr(sperry Br)

FairPosted for load

Nez Perce County, Idaho · At Kendrick Scl · Structure no. 000000000029935

Built
1908
117 years old
Condition
Fair
inspected September 2024
Type
Truss - Thru
Steel
Length
242 ft
2 main spans
Daily traffic
170
2023 count
Owner
County
County Highway Agency

About this bridge

Sperry Grade RD over Potlatch Rvr(sperry Br) is a steel truss - thru carrying Sperry Grade RD over Potlatch Rvr(sperry Br) in Nez Perce County, Idaho. It was built in 1908, so it is 117 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. Its operating status is: posted for load restriction.

It carries about 170 vehicles a day, roughly 5% of them trucks, projected to reach 255 by 2039. The structure is 242 ft (73.8 m) long and 17 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesSperry Grade RD
CrossesPotlatch Rvr(sperry Br)
LocationAt Kendrick Scl
RouteCity Street 0
CountyNez Perce County
StateIdaho
Coordinates46.61211, -116.65786
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating12 US tons
Inventory rating7.1 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans2
Design loadH 10
Structure length242 ft (73.8 m)
Longest span119 ft (36.3 m)
Deck width17 ft (5.2 m)
Roadway width15 ft (4.6 m)
Vertical clearance over deck16 ft (5 m)

Traffic and service

Average daily traffic170 (2023)
Projected traffic255 by 2039
Trucks5%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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$1.9 million (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Sperry Grade RD over Potlatch Rvr(sperry Br) built?

It was built in 1908, making it 117 years old in 2025.

What condition is Sperry Grade RD over Potlatch Rvr(sperry 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 September 2024.

How much traffic does Sperry Grade RD over Potlatch Rvr(sperry Br) carry?

About 170 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Sperry Grade RD over Potlatch Rvr(sperry Br)?

The structure is 242 ft (73.8 m) long with a longest span of 119 ft (36.3 m) and a deck 17 ft wide.

Who owns Sperry Grade RD over Potlatch Rvr(sperry Br)?

It is owned by the County Highway Agency.