US Bridges

Nd Highway 1806 over Little Heart River

Good

Morton County, North Dakota · 10 South of I-94 · Structure no. 1806059819

Built
1990
35 years old
Condition
Good
inspected June 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
130 ft
3 main spans
Daily traffic
1,700
2019 count
Owner
State
State Highway Agency

About this bridge

Nd Highway 1806 over Little Heart River is a prestressed concrete continuous box beam or girders - single or spread carrying Nd Highway 1806 over Little Heart River in Morton County, North Dakota. It was built in 1990, so it is 35 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 1,700 vehicles a day, roughly 7% of them trucks, projected to reach 825 by 2039. The structure is 130 ft (39.6 m) long and 43 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

CarriesNd Highway 1806
CrossesLittle Heart River
Location10 South of I-94
RouteState Highway 1806
Coordinates46.69104, -100.80487
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
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 geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86.9 US tons
Inventory rating51.9 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length130 ft (39.6 m)
Longest span41 ft (12.5 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,700 (2019)
Projected traffic825 by 2039
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 1806 over Little Heart River built?

It was built in 1990, making it 35 years old in 2025.

What condition is Nd Highway 1806 over Little 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 June 2024.

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

About 1,700 vehicles per day (2019 count), of which roughly 7% are trucks.

How long is Nd Highway 1806 over Little Heart River?

The structure is 130 ft (39.6 m) long with a longest span of 41 ft (12.5 m) and a deck 43 ft wide.

Who owns Nd Highway 1806 over Little Heart River?

It is owned by the State Highway Agency.