US Bridges

Nd Highway 18 over Forest River

Good

Grand Forks County, North Dakota · 2 North of Inkster · Structure no. 0018182408

Built
2003
22 years old
Condition
Good
inspected September 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
152 ft
3 main spans
Daily traffic
690
2019 count
Owner
State
State Highway Agency

About this bridge

Nd Highway 18 over Forest River is a prestressed concrete continuous box beam or girders - single or spread carrying Nd Highway 18 over Forest River in Grand Forks County, North Dakota. It was built in 2003, so it is 22 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 690 vehicles a day, roughly 17% of them trucks, projected to reach 830 by 2039. The structure is 152 ft (46.3 m) long and 38 ft wide. If it were closed, the detour would be 24.2 mi (39 km).

CarriesNd Highway 18
CrossesForest River
Location2 North of Inkster
RouteState Highway 18
Coordinates48.18078, -97.62287
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 protection7 GoodSome minor problems.
Last inspectionSeptember 2024
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 rating99 US tons
Inventory rating61.9 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length152 ft (46.3 m)
Longest span50 ft (15.2 m)
Deck width38 ft (11.7 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic690 (2019)
Projected traffic830 by 2039
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.2 mi (39 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 18 over Forest River built?

It was built in 2003, making it 22 years old in 2025.

What condition is Nd Highway 18 over Forest 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 September 2024.

How much traffic does Nd Highway 18 over Forest River carry?

About 690 vehicles per day (2019 count), of which roughly 17% are trucks.

How long is Nd Highway 18 over Forest River?

The structure is 152 ft (46.3 m) long with a longest span of 50 ft (15.2 m) and a deck 38 ft wide.

Who owns Nd Highway 18 over Forest River?

It is owned by the State Highway Agency.