US Bridges

Zims RD over Little Salmon River

Fair

Adams County, Idaho · 4.7 N. 0.4 W. New Meadows · Structure no. 000000000026500

Built
1930
95 years old, rebuilt 1990
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
80 ft
2 main spans
Daily traffic
100
2023 count
Owner
County
County Highway Agency

About this bridge

Zims RD over Little Salmon River is a steel stringer/multi-beam or girder carrying Zims RD over Little Salmon River in Adams County, Idaho. It was built in 1930 and reconstructed in 1990, so it is 95 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.

It carries about 100 vehicles a day, roughly 11% of them trucks, projected to reach 150 by 2042. The structure is 80 ft (24.4 m) long and 18 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesZims RD
CrossesLittle Salmon River
Location4.7 N. 0.4 W. New Meadows
RouteCounty Highway 0
CountyAdams County
StateIdaho
Coordinates45.03886, -116.28864
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being 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 rating52 US tons
Inventory rating31 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans2
Design loadH 15
Structure length80 ft (24.4 m)
Longest span38 ft (11.6 m)
Deck width18 ft (5.5 m)
Roadway width17 ft (5.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2023)
Projected traffic150 by 2042
Trucks11%
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$735,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Zims RD over Little Salmon River built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1990.

What condition is Zims RD over Little Salmon River 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 Zims RD over Little Salmon River carry?

About 100 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is Zims RD over Little Salmon River?

The structure is 80 ft (24.4 m) long with a longest span of 38 ft (11.6 m) and a deck 18 ft wide.

Who owns Zims RD over Little Salmon River?

It is owned by the County Highway Agency.