US Bridges

400 North Road over Main Northside Canal

Fair

Minidoka County, Idaho · 0.6 N. 2.8 E. Acequia · Structure no. 000000000025241

Built
1998
27 years old
Condition
Fair
inspected November 2023
Type
Frame
Concrete Continuous
Length
126 ft
5 main spans
Daily traffic
300
2023 count
Owner
County
County Highway Agency

About this bridge

400 North Road over Main Northside Canal is a concrete continuous frame carrying 400 North Road over Main Northside Canal in Minidoka County, Idaho. It was built in 1998, so it is 27 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 300 vehicles a day, roughly 10% of them trucks, projected to reach 450 by 2039. The structure is 126 ft (38.4 m) long and 36 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
Carries400 North Road
CrossesMain Northside Canal
Location0.6 N. 2.8 E. Acequia
RouteCounty Highway 0
CountyMinidoka County
StateIdaho
Coordinates42.67736, -113.54842
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating46 US tons
Inventory rating27 US tons

Structure

Structure typeFrame
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length126 ft (38.4 m)
Longest span24 ft (7.3 m)
Deck width36 ft (11.1 m)
Roadway width34 ft (10.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2023)
Projected traffic450 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 400 North Road over Main Northside Canal built?

It was built in 1998, making it 27 years old in 2025.

What condition is 400 North Road over Main Northside 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 November 2023.

How much traffic does 400 North Road over Main Northside Canal carry?

About 300 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is 400 North Road over Main Northside Canal?

The structure is 126 ft (38.4 m) long with a longest span of 24 ft (7.3 m) and a deck 36 ft wide.

Who owns 400 North Road over Main Northside Canal?

It is owned by the County Highway Agency.