US Bridges

Nd Highway 49 over Cannonball River

Fair

Grant County, North Dakota · 2 South Jct. Nd 21 · Structure no. 0049027574

Built
1970
55 years old
Condition
Fair
inspected June 2023
Type
Girder and Floorbeam System
Steel Continuous
Length
325 ft
3 main spans
Daily traffic
420
2019 count
Owner
State
State Highway Agency

About this bridge

Nd Highway 49 over Cannonball River is a steel continuous girder and floorbeam system carrying Nd Highway 49 over Cannonball River in Grant County, North Dakota. It was built in 1970, so it is 55 years old, older than the North Dakota average of 48.2 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 420 vehicles a day, roughly 12% of them trucks, projected to reach 330 by 2039. The structure is 325 ft (99.1 m) long and 37 ft wide. If it were closed, the detour would be 47.8 mi (77 km).

Location

Open in Google Maps
CarriesNd Highway 49
CrossesCannonball River
Location2 South Jct. Nd 21
RouteState Highway 49
CountyGrant County
StateNorth Dakota
Coordinates46.34163, -101.96247
Functional classRural Minor Arterial

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating71.9 US tons
Inventory rating43 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length325 ft (99.1 m)
Longest span160 ft (48.8 m)
Deck width37 ft (11.2 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic420 (2019)
Projected traffic330 by 2039
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed47.8 mi (77 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Nd Highway 49 over Cannonball River built?

It was built in 1970, making it 55 years old in 2025.

What condition is Nd Highway 49 over Cannonball River 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 June 2023.

How much traffic does Nd Highway 49 over Cannonball River carry?

About 420 vehicles per day (2019 count), of which roughly 12% are trucks.

How long is Nd Highway 49 over Cannonball River?

The structure is 325 ft (99.1 m) long with a longest span of 160 ft (48.8 m) and a deck 37 ft wide.

Who owns Nd Highway 49 over Cannonball River?

It is owned by the State Highway Agency.