US Bridges

Ailor Road over Big Bear Creek;sw Deary

Fair

Latah County, Idaho · 0.4 S. 2.5 W. Deary · Structure no. 000000000029490

Built
1975
50 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
49 ft
1 main span
Daily traffic
50
2023 count
Owner
Local
Other Local Agency

About this bridge

Ailor Road over Big Bear Creek;sw Deary is a steel stringer/multi-beam or girder carrying Ailor Road over Big Bear Creek;sw Deary in Latah County, Idaho. It was built in 1975, so it is 50 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 50 vehicles a day, roughly 10% of them trucks, projected to reach 75 by 2039. The structure is 49 ft (14.9 m) long and 24 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesAilor Road
CrossesBig Bear Creek;sw Deary
Location0.4 S. 2.5 W. Deary
RouteCounty Highway 0
CountyLatah County
StateIdaho
Coordinates46.79247, -116.60875
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 protection8 Very GoodNo problems noted.
Last inspectionMay 2023
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating36 US tons
Inventory rating21.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadH 15
Structure length49 ft (14.9 m)
Longest span47 ft (14.3 m)
Deck width24 ft (7.4 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic75 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther Local Agency
Maintained byOther Local Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$478,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Ailor Road over Big Bear Creek;sw Deary built?

It was built in 1975, making it 50 years old in 2025.

What condition is Ailor Road over Big Bear Creek;sw Deary 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 May 2023.

How much traffic does Ailor Road over Big Bear Creek;sw Deary carry?

About 50 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Ailor Road over Big Bear Creek;sw Deary?

The structure is 49 ft (14.9 m) long with a longest span of 47 ft (14.3 m) and a deck 24 ft wide.

Who owns Ailor Road over Big Bear Creek;sw Deary?

It is owned by the Other Local Agency.