US Bridges

STC2866;BASELINE over A-1 Canal

Fair

Minidoka County, Idaho · 3.2 E. Rupert · Structure no. 000000000019636

Built
1996
29 years old
Condition
Fair
inspected April 2023
Type
Frame
Concrete
Length
27 ft
1 main span
Daily traffic
1,500
2023 count
Owner
County
County Highway Agency

About this bridge

STC2866;BASELINE over A-1 Canal is a concrete frame carrying STC2866;BASELINE over A-1 Canal in Minidoka County, Idaho. It was built in 1996, so it is 29 years old, younger 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 1,500 vehicles a day, roughly 8% of them trucks, projected to reach 2,250 by 2042. The structure is 27 ft (8.2 m) long and 38 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesSTC2866;BASELINE
CrossesA-1 Canal
Location3.2 E. Rupert
RouteCounty Highway 2866
StateIdaho
Coordinates42.61983, -113.60403
Functional classRural Major 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating21.1 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length27 ft (8.2 m)
Longest span27 ft (8.2 m)
Deck width38 ft (11.6 m)
Roadway width38 ft (11.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,500 (2023)
Projected traffic2,250 by 2042
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 STC2866;BASELINE over A-1 Canal built?

It was built in 1996, making it 29 years old in 2025.

What condition is STC2866;BASELINE over A-1 Canal 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 April 2023.

How much traffic does STC2866;BASELINE over A-1 Canal carry?

About 1,500 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is STC2866;BASELINE over A-1 Canal?

The structure is 27 ft (8.2 m) long with a longest span of 27 ft (8.2 m) and a deck 38 ft wide.

Who owns STC2866;BASELINE over A-1 Canal?

It is owned by the County Highway Agency.