US Bridges

Smiley C Airport R over Salmon River

FairPosted for load

Blaine County, Idaho · Sawtooth City Airport RD · Structure no. 000000000023793

Built
1950
75 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
51 ft
1 main span
Daily traffic
30
2023 count
Owner
State
Other State Agency

About this bridge

Smiley C Airport R over Salmon River is a steel stringer/multi-beam or girder carrying Smiley C Airport R over Salmon River in Blaine County, Idaho. It was built in 1950, so it is 75 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. Its operating status is: posted for load restriction.

It carries about 30 vehicles a day, projected to reach 45 by 2039. The structure is 51 ft (15.5 m) long and 13 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSmiley C Airport R
CrossesSalmon River
LocationSawtooth City Airport RD
RouteState Lands Road 0
CountyBlaine County
StateIdaho
Coordinates43.90778, -114.79444
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
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 rating2 US tons
Inventory rating1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadH 10
Structure length51 ft (15.5 m)
Longest span50 ft (15.2 m)
Deck width13 ft (3.9 m)
Roadway width10 ft (3.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2023)
Projected traffic45 by 2039
Trucks0%
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

OwnerOther State Agency
Maintained byOther State Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$277,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Smiley C Airport R over Salmon River built?

It was built in 1950, making it 75 years old in 2025.

What condition is Smiley C Airport R over 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 Smiley C Airport R over Salmon River carry?

About 30 vehicles per day (2023 count).

How long is Smiley C Airport R over Salmon River?

The structure is 51 ft (15.5 m) long with a longest span of 50 ft (15.2 m) and a deck 13 ft wide.

Who owns Smiley C Airport R over Salmon River?

It is owned by the Other State Agency.