US Bridges

128th Ave SW over N. Fork Cannonball River

Good

Slope County, North Dakota · 6 North 13 East of Amidon · Structure no. 000000044149040

Built
1983
42 years old
Condition
Good
inspected October 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
90 ft
2 main spans
Daily traffic
26
2018 count
Owner
County
County Highway Agency

About this bridge

128th Ave SW over N. Fork Cannonball River is a prestressed concrete continuous box beam or girders - single or spread carrying 128th Ave SW over N. Fork Cannonball River in Slope County, North Dakota. It was built in 1983, so it is 42 years old, younger than the North Dakota average of 48.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 26 vehicles a day, projected to reach 30 by 2038. The structure is 90 ft (27.4 m) long and 33 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
Carries128th Ave SW
CrossesN. Fork Cannonball River
Location6 North 13 East of Amidon
RouteCounty Highway 4402
CountySlope County
StateNorth Dakota
Coordinates46.56748, -103.03081
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.2 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length90 ft (27.4 m)
Longest span45 ft (13.7 m)
Deck width33 ft (10.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26 (2018)
Projected traffic30 by 2038
Trucks—
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 statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 128th Ave SW over N. Fork Cannonball River built?

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

What condition is 128th Ave SW over N. Fork Cannonball River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.

How much traffic does 128th Ave SW over N. Fork Cannonball River carry?

About 26 vehicles per day (2018 count).

How long is 128th Ave SW over N. Fork Cannonball River?

The structure is 90 ft (27.4 m) long with a longest span of 45 ft (13.7 m) and a deck 33 ft wide.

Who owns 128th Ave SW over N. Fork Cannonball River?

It is owned by the County Highway Agency.