US Bridges

Smylie Lane over N.Fk.Payette River

Fair

Valley County, Idaho · 4.1 N. 3.2 W. Donnelly · Structure no. 000000000028590

Built
1977
48 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
186 ft
3 main spans
Daily traffic
90
2023 count
Owner
County
County Highway Agency

About this bridge

Smylie Lane over N.Fk.Payette River is a prestressed concrete stringer/multi-beam or girder carrying Smylie Lane over N.Fk.Payette River in Valley County, Idaho. It was built in 1977, so it is 48 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 6 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 90 vehicles a day, roughly 10% of them trucks, projected to reach 135 by 2039. The structure is 186 ft (56.7 m) long and 28 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

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CarriesSmylie Lane
CrossesN.Fk.Payette River
Location4.1 N. 3.2 W. Donnelly
RouteCounty Highway 0
CountyValley County
StateIdaho
Coordinates44.79003, -116.14075
Functional classRural Minor Collector

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating55.6 US tons
Inventory rating39.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length186 ft (56.7 m)
Longest span62 ft (18.9 m)
Deck width28 ft (8.5 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic90 (2023)
Projected traffic135 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Smylie Lane over N.Fk.Payette River built?

It was built in 1977, making it 48 years old in 2025.

What condition is Smylie Lane over N.Fk.Payette 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 August 2023.

How much traffic does Smylie Lane over N.Fk.Payette River carry?

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

How long is Smylie Lane over N.Fk.Payette River?

The structure is 186 ft (56.7 m) long with a longest span of 62 ft (18.9 m) and a deck 28 ft wide.

Who owns Smylie Lane over N.Fk.Payette River?

It is owned by the County Highway Agency.