US Bridges

Smith Ferry Drive over N.Fk.Payette River

Poor

Valley County, Idaho · 0.2 E. Smiths Ferry · Structure no. 000000000028635

Built
1959
66 years old
Condition
Poor
inspected August 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
240 ft
6 main spans
Daily traffic
90
2023 count
Owner
County
County Highway Agency

About this bridge

Smith Ferry Drive over N.Fk.Payette River is a concrete stringer/multi-beam or girder carrying Smith Ferry Drive over N.Fk.Payette River in Valley County, Idaho. It was built in 1959, so it is 66 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.

It carries about 90 vehicles a day, roughly 10% of them trucks, projected to reach 135 by 2039. The structure is 240 ft (73.2 m) long and 16 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesSmith Ferry Drive
CrossesN.Fk.Payette River
Location0.2 E. Smiths Ferry
RouteCounty Highway 0
StateIdaho
Coordinates44.30292, -116.08614
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
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating18 US tons

Structure

MaterialConcrete
DeckConcrete, cast-in-place
Main spans6
Design loadH 15
Structure length240 ft (73.2 m)
Longest span40 ft (12.2 m)
Deck width16 ft (4.9 m)
Roadway width13 ft (4.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic90 (2023)
Projected traffic135 by 2039
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Smith Ferry Drive over N.Fk.Payette River built?

It was built in 1959, making it 66 years old in 2025.

What condition is Smith Ferry Drive over N.Fk.Payette 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 August 2024.

How much traffic does Smith Ferry Drive over N.Fk.Payette River carry?

About 90 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Smith Ferry Drive over N.Fk.Payette River?

The structure is 240 ft (73.2 m) long with a longest span of 40 ft (12.2 m) and a deck 16 ft wide.

Who owns Smith Ferry Drive over N.Fk.Payette River?

It is owned by the County Highway Agency.