US Bridges

Nd Highway 1806 over Heart River

Good

Morton County, North Dakota · 1 South of I-94 · Structure no. 1806069384

Built
1976
49 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
251 ft
3 main spans
Daily traffic
7,360
2019 count
Owner
State
State Highway Agency

About this bridge

Nd Highway 1806 over Heart River is a steel continuous stringer/multi-beam or girder carrying Nd Highway 1806 over Heart River in Morton County, North Dakota. It was built in 1976, so it is 49 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 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 7,360 vehicles a day, roughly 3% of them trucks, projected to reach 6,472 by 2039. The structure is 251 ft (76.5 m) long and 53 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesNd Highway 1806
CrossesHeart River
Location1 South of I-94
RouteState Highway 1806
Coordinates46.81761, -100.87949
Functional classUrban Other Principal 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 inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating61.9 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length251 ft (76.5 m)
Longest span151 ft (46 m)
Deck width53 ft (16.3 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,360 (2019)
Projected traffic6,472 by 2039
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

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 1806 over Heart River built?

It was built in 1976, making it 49 years old in 2025.

What condition is Nd Highway 1806 over Heart 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 July 2023.

How much traffic does Nd Highway 1806 over Heart River carry?

About 7,360 vehicles per day (2019 count), of which roughly 3% are trucks.

How long is Nd Highway 1806 over Heart River?

The structure is 251 ft (76.5 m) long with a longest span of 151 ft (46 m) and a deck 53 ft wide.

Who owns Nd Highway 1806 over Heart River?

It is owned by the State Highway Agency.