US Bridges

Irrsr Nd Hiway 31 over Cannonball River

Good

Grant County, North Dakota · 13 North of Sd Border · Structure no. 0031012802

Built
2014
11 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
318 ft
3 main spans
Daily traffic
260
2019 count
Owner
State
State Highway Agency

About this bridge

Irrsr Nd Hiway 31 over Cannonball River is a prestressed concrete stringer/multi-beam or girder carrying Irrsr Nd Hiway 31 over Cannonball River in Grant County, North Dakota. It was built in 2014, so it is 11 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 260 vehicles a day, roughly 23% of them trucks, projected to reach 230 by 2039. The structure is 318 ft (96.9 m) long and 34 ft wide. If it were closed, the detour would be 44.7 mi (72 km).

Location

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CarriesIrrsr Nd Hiway 31
CrossesCannonball River
Location13 North of Sd Border
RouteState Highway 31
CountyGrant County
StateNorth Dakota
Coordinates46.1265, -101.33282
Functional classRural Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating74.8 US tons
Inventory rating55.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length318 ft (96.9 m)
Longest span106 ft (32.4 m)
Deck width34 ft (10.5 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic260 (2019)
Projected traffic230 by 2039
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed44.7 mi (72 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$536,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Irrsr Nd Hiway 31 over Cannonball River built?

It was built in 2014, making it 11 years old in 2025.

What condition is Irrsr Nd Hiway 31 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 May 2023.

How much traffic does Irrsr Nd Hiway 31 over Cannonball River carry?

About 260 vehicles per day (2019 count), of which roughly 23% are trucks.

How long is Irrsr Nd Hiway 31 over Cannonball River?

The structure is 318 ft (96.9 m) long with a longest span of 106 ft (32.4 m) and a deck 34 ft wide.

Who owns Irrsr Nd Hiway 31 over Cannonball River?

It is owned by the State Highway Agency.