US Bridges

300 South Road over B-4 Canal

Fair

Minidoka County, Idaho · 2.0 S. 0.8 W. Paul · Structure no. 000000000025255

Built
1983
42 years old
Condition
Fair
inspected March 2024
Type
Frame
Concrete
Length
22 ft
1 main span
Daily traffic
200
2023 count
Owner
County
County Highway Agency

About this bridge

300 South Road over B-4 Canal is a concrete frame carrying 300 South Road over B-4 Canal in Minidoka County, Idaho. It was built in 1983, so it is 42 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 200 vehicles a day, roughly 10% of them trucks, projected to reach 300 by 2039. The structure is 22 ft (6.7 m) long and 41 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Carries300 South Road
CrossesB-4 Canal
Location2.0 S. 0.8 W. Paul
RouteCounty Highway 0
StateIdaho
Coordinates42.57583, -113.79944
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length22 ft (6.7 m)
Longest span22 ft (6.7 m)
Deck width41 ft (12.5 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2023)
Projected traffic300 by 2039
Trucks10%
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

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 300 South Road over B-4 Canal built?

It was built in 1983, making it 42 years old in 2025.

What condition is 300 South Road 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 2024.

How much traffic does 300 South Road over B-4 Canal carry?

About 200 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is 300 South Road over B-4 Canal?

The structure is 22 ft (6.7 m) long with a longest span of 22 ft (6.7 m) and a deck 41 ft wide.

Who owns 300 South Road over B-4 Canal?

It is owned by the County Highway Agency.