US Bridges

79th Ave SW over Cannonball River

Good

Hettinger County, North Dakota · 1 North of Bentley · Structure no. 000000021141201

Built
2024
1 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
189 ft
3 main spans
Daily traffic
80
2020 count
Owner
County
County Highway Agency

About this bridge

79th Ave SW over Cannonball River is a prestressed concrete stringer/multi-beam or girder carrying 79th Ave SW over Cannonball River in Hettinger County, North Dakota. It was built in 2024, so it is 1 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 80 vehicles a day, roughly 25% of them trucks, projected to reach 150 by 2038. The structure is 189 ft (57.6 m) long and 32 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Carries79th Ave SW
CrossesCannonball River
Location1 North of Bentley
RouteCounty Highway 2141
Coordinates46.34515, -102.06707
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.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating60.7 US tons
Inventory rating46.4 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length189 ft (57.6 m)
Longest span65 ft (19.9 m)
Deck width32 ft (9.9 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80 (2020)
Projected traffic150 by 2038
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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 79th Ave SW over Cannonball River built?

It was built in 2024, making it 1 years old in 2025.

What condition is 79th Ave SW over 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 April 2024.

How much traffic does 79th Ave SW over Cannonball River carry?

About 80 vehicles per day (2020 count), of which roughly 25% are trucks.

How long is 79th Ave SW over Cannonball River?

The structure is 189 ft (57.6 m) long with a longest span of 65 ft (19.9 m) and a deck 32 ft wide.

Who owns 79th Ave SW over Cannonball River?

It is owned by the County Highway Agency.