US Bridges

Cottonwood Road over Cottonwood Creek

Fair

Bannock County, Idaho · 10.0 E. 2.0 N Downey · Structure no. 000000000022167

Built
1975
50 years old
Condition
Fair
inspected September 2024
Type
Tee Beam
Prestressed Concrete
Length
30 ft
1 main span
Daily traffic
10
2023 count
Owner
State
Other State Agency

About this bridge

Cottonwood Road over Cottonwood Creek is a prestressed concrete tee beam carrying Cottonwood Road over Cottonwood Creek in Bannock 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 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 10 vehicles a day, roughly 10% of them trucks, projected to reach 15 by 2039. The structure is 30 ft (9.1 m) long and 16 ft wide. If it were closed, the detour would be 61.5 mi (99 km).

Location

Open in Google Maps
CarriesCottonwood Road
CrossesCottonwood Creek
Location10.0 E. 2.0 N Downey
RouteState Lands Road 0
CountyBannock County
StateIdaho
Coordinates42.44417, -111.91508
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating61.9 US tons
Inventory rating52 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span28 ft (8.5 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2023)
Projected traffic15 by 2039
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed61.5 mi (99 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$345,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Cottonwood Road over Cottonwood Creek built?

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

What condition is Cottonwood Road over Cottonwood Creek 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 Cottonwood Road over Cottonwood Creek carry?

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

How long is Cottonwood Road over Cottonwood Creek?

The structure is 30 ft (9.1 m) long with a longest span of 28 ft (8.5 m) and a deck 16 ft wide.

Who owns Cottonwood Road over Cottonwood Creek?

It is owned by the Other State Agency.