US Bridges

Lenore Grade Road over Clearwater R;lenore Br.

PoorPosted for load

Nez Perce County, Idaho · At Lenore;adjacent US 12 · Structure no. 000000000029965

Built
1935
90 years old, rebuilt 1965
Condition
Poor
inspected July 2024
Type
Girder and Floorbeam System
Steel
Length
526 ft
1 main span
Daily traffic
400
2023 count
Owner
County
County Highway Agency

About this bridge

Lenore Grade Road over Clearwater R;lenore Br. is a steel girder and floorbeam system carrying Lenore Grade Road over Clearwater R;lenore Br. in Nez Perce County, Idaho. It was built in 1935 and reconstructed in 1965, 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. Its operating status is: posted for load restriction.

It carries about 400 vehicles a day, roughly 5% of them trucks, projected to reach 600 by 2039. The structure is 526 ft (160.3 m) long and 18 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesLenore Grade Road
CrossesClearwater R;lenore Br.
LocationAt Lenore;adjacent US 12
RouteCounty Highway 0
CountyNez Perce County
StateIdaho
Coordinates46.50683, -116.55286
Functional classRural Minor Collector

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating16 US tons
Inventory rating10 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckWood or timber
Main spans1 (+4 approach)
Design loadH 15
Structure length526 ft (160.3 m)
Longest span160 ft (48.8 m)
Deck width18 ft (5.5 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2023)
Projected traffic600 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$4.7 million (2019 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Lenore Grade Road over Clearwater R;lenore Br. built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 1965.

What condition is Lenore Grade Road over Clearwater R;lenore Br. 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 July 2024.

How much traffic does Lenore Grade Road over Clearwater R;lenore Br. carry?

About 400 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Lenore Grade Road over Clearwater R;lenore Br.?

The structure is 526 ft (160.3 m) long with a longest span of 160 ft (48.8 m) and a deck 18 ft wide.

Who owns Lenore Grade Road over Clearwater R;lenore Br.?

It is owned by the County Highway Agency.