US Bridges

Stc 3007;UNITY RD over Weiser River

PoorPosted for load

Washington County, Idaho · 0.7 S. 5.6 E. Weiser · Structure no. 000000000028795

Built
1910
115 years old, rebuilt 2000
Condition
Poor
inspected July 2024
Type
Truss - Thru
Steel
Length
303 ft
2 main spans
Daily traffic
180
2023 count
Owner
County
County Highway Agency

About this bridge

Stc 3007;UNITY RD over Weiser River is a steel truss - thru carrying Stc 3007;UNITY RD over Weiser River in Washington County, Idaho. It was built in 1910 and reconstructed in 2000, so it is 115 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 180 vehicles a day, roughly 13% of them trucks, projected to reach 270 by 2042. The structure is 303 ft (92.4 m) long and 19 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesStc 3007;UNITY RD
CrossesWeiser River
Location0.7 S. 5.6 E. Weiser
RouteCounty Highway 3007
StateIdaho
Coordinates44.23508, -116.85742
Functional classRural Major 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 12 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31 US tons
Inventory rating18 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckCorrugated steel
Main spans2
Design loadH 10
Structure length303 ft (92.4 m)
Longest span150 ft (45.7 m)
Deck width19 ft (5.7 m)
Roadway width15 ft (4.5 m)
Vertical clearance over deck14 ft (4.2 m)

Traffic and service

Average daily traffic180 (2023)
Projected traffic270 by 2042
Trucks13%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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$2.3 million (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Stc 3007;UNITY RD over Weiser River built?

It was built in 1910, making it 115 years old in 2025. It was reconstructed in 2000.

What condition is Stc 3007;UNITY RD over Weiser River 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 Stc 3007;UNITY RD over Weiser River carry?

About 180 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is Stc 3007;UNITY RD over Weiser River?

The structure is 303 ft (92.4 m) long with a longest span of 150 ft (45.7 m) and a deck 19 ft wide.

Who owns Stc 3007;UNITY RD over Weiser River?

It is owned by the County Highway Agency.