US Bridges

SH 25 over B-4 Canal

Fair

Minidoka County, Idaho · At Rupert Swcl · Structure no. 000000000013071

Built
2001
24 years old
Condition
Fair
inspected March 2022
Type
Slab
Concrete
Length
51 ft
3 main spans
Daily traffic
6,300
2023 count
Owner
State
State Highway Agency

About this bridge

SH 25 over B-4 Canal is a concrete slab carrying SH 25 over B-4 Canal in Minidoka County, Idaho. It was built in 2001, so it is 24 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 6,300 vehicles a day, roughly 5% of them trucks, projected to reach 9,450 by 2042. The structure is 51 ft (15.5 m) long and 76 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSH 25
CrossesB-4 Canal
LocationAt Rupert Swcl
RouteState Highway 25
CountyMinidoka County
StateIdaho
Coordinates42.60489, -113.68861
Functional classUrban Minor Arterial

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 protection8 Very GoodNo problems noted.
Last inspectionMarch 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating96 US tons
Inventory rating58 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length51 ft (15.5 m)
Longest span19 ft (5.8 m)
Deck width76 ft (23.3 m)
Roadway width65 ft (19.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,300 (2023)
Projected traffic9,450 by 2042
Trucks5%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 25 over B-4 Canal built?

It was built in 2001, making it 24 years old in 2025.

What condition is SH 25 over B-4 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 2022.

How much traffic does SH 25 over B-4 Canal carry?

About 6,300 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is SH 25 over B-4 Canal?

The structure is 51 ft (15.5 m) long with a longest span of 19 ft (5.8 m) and a deck 76 ft wide.

Who owns SH 25 over B-4 Canal?

It is owned by the State Highway Agency.