US Bridges

SH 25 over A-1 Canal

Fair

Minidoka County, Idaho · 2.9 SE Rupert · Structure no. 000000000013080

Built
1950
75 years old
Condition
Fair
inspected March 2023
Type
Frame
Concrete
Length
33 ft
1 main span
Daily traffic
2,600
2023 count
Owner
State
State Highway Agency

About this bridge

SH 25 over A-1 Canal is a concrete frame carrying SH 25 over A-1 Canal in Minidoka 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.

It carries about 2,600 vehicles a day, roughly 23% of them trucks, projected to reach 3,900 by 2042. The structure is 33 ft (10.1 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSH 25
CrossesA-1 Canal
Location2.9 SE Rupert
RouteState Highway 25
CountyMinidoka County
StateIdaho
Coordinates42.59264, -113.62864
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionMarch 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64 US tons
Inventory rating38 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length33 ft (10.1 m)
Longest span31 ft (9.4 m)
Deck width28 ft (8.5 m)
Roadway width25 ft (7.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,600 (2023)
Projected traffic3,900 by 2042
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$530,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 25 over A-1 Canal built?

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

What condition is SH 25 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 March 2023.

How much traffic does SH 25 over A-1 Canal carry?

About 2,600 vehicles per day (2023 count), of which roughly 23% are trucks.

How long is SH 25 over A-1 Canal?

The structure is 33 ft (10.1 m) long with a longest span of 31 ft (9.4 m) and a deck 28 ft wide.

Who owns SH 25 over A-1 Canal?

It is owned by the State Highway Agency.