US Bridges

Nd Highway 46 over Maple River

Good

Ransom County, North Dakota · 3 East of Enderlin · Structure no. 0046086404

Built
1981
44 years old
Condition
Good
inspected June 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
198 ft
3 main spans
Daily traffic
1,200
2019 count
Owner
State
State Highway Agency

About this bridge

Nd Highway 46 over Maple River is a prestressed concrete continuous box beam or girders - single or spread carrying Nd Highway 46 over Maple River in Ransom County, North Dakota. It was built in 1981, so it is 44 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 1,200 vehicles a day, roughly 13% of them trucks, projected to reach 1,056 by 2039. The structure is 198 ft (60.4 m) long and 43 ft wide. If it were closed, the detour would be 49.7 mi (80 km).

CarriesNd Highway 46
CrossesMaple River
Location3 East of Enderlin
RouteState Highway 46
Coordinates46.62962, -97.5431
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating87.4 US tons
Inventory rating43.9 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length198 ft (60.4 m)
Longest span64 ft (19.5 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,200 (2019)
Projected traffic1,056 by 2039
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed49.7 mi (80 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 46 over Maple River built?

It was built in 1981, making it 44 years old in 2025.

What condition is Nd Highway 46 over Maple 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 June 2023.

How much traffic does Nd Highway 46 over Maple River carry?

About 1,200 vehicles per day (2019 count), of which roughly 13% are trucks.

How long is Nd Highway 46 over Maple River?

The structure is 198 ft (60.4 m) long with a longest span of 64 ft (19.5 m) and a deck 43 ft wide.

Who owns Nd Highway 46 over Maple River?

It is owned by the State Highway Agency.