US Bridges

Highline Arrow RD over Potlatch R(arrow JCT Br)

PoorPosted for load

Nez Perce County, Idaho · 2.2 N. 2.3 E. Spalding · Structure no. 000000000029845

Built
1920
105 years old
Condition
Poor
inspected September 2024
Type
Truss - Thru
Steel
Length
131 ft
1 main span
Daily traffic
90
2023 count
Owner
County
County Highway Agency

About this bridge

Highline Arrow RD over Potlatch R(arrow JCT Br) is a steel truss - thru carrying Highline Arrow RD over Potlatch R(arrow JCT Br) in Nez Perce 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 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 90 vehicles a day, roughly 5% of them trucks, projected to reach 135 by 2039. The structure is 131 ft (39.9 m) long and 19 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesHighline Arrow RD
CrossesPotlatch R(arrow JCT Br)
Location2.2 N. 2.3 E. Spalding
RouteCounty Highway 0
StateIdaho
Coordinates46.47653, -116.76689
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
Deck4 PoorAdvanced section loss, deterioration, 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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
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 alignment6: Equal to present minimum criteria
Operating rating5 US tons
Inventory rating5 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadH 15
Structure length131 ft (39.9 m)
Longest span128 ft (39 m)
Deck width19 ft (5.9 m)
Roadway width17 ft (5.3 m)
Vertical clearance over deck11 ft (3.3 m)

Traffic and service

Average daily traffic90 (2023)
Projected traffic135 by 2039
Trucks5%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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$1.1 million (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Highline Arrow RD over Potlatch R(arrow JCT Br) built?

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

What condition is Highline Arrow RD over Potlatch R(arrow JCT 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 September 2024.

How much traffic does Highline Arrow RD over Potlatch R(arrow JCT Br) carry?

About 90 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Highline Arrow RD over Potlatch R(arrow JCT Br)?

The structure is 131 ft (39.9 m) long with a longest span of 128 ft (39 m) and a deck 19 ft wide.

Who owns Highline Arrow RD over Potlatch R(arrow JCT Br)?

It is owned by the County Highway Agency.