US Bridges

Nd Highway 18 over Sheyenne River

Fair

Richland County, North Dakota · 5 South of Nd 46 · Structure no. 0018045621

Built
1960
65 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
155 ft
3 main spans
Daily traffic
630
2019 count
Owner
State
State Highway Agency

About this bridge

Nd Highway 18 over Sheyenne River is a steel continuous stringer/multi-beam or girder carrying Nd Highway 18 over Sheyenne River in Richland County, North Dakota. It was built in 1960, so it is 65 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 5 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 630 vehicles a day, roughly 19% of them trucks, projected to reach 630 by 2039. The structure is 155 ft (47.2 m) long and 35 ft wide. If it were closed, the detour would be 52.2 mi (84 km).

Location

Open in Google Maps
CarriesNd Highway 18
CrossesSheyenne River
Location5 South of Nd 46
RouteState Highway 18
CountyRichland County
StateNorth Dakota
Coordinates46.55676, -97.13814
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure8 Very GoodNo problems noted.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.1 US tons
Inventory rating37.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length155 ft (47.2 m)
Longest span55 ft (16.8 m)
Deck width35 ft (10.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic630 (2019)
Projected traffic630 by 2039
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed52.2 mi (84 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 Sheyenne River built?

It was built in 1960, making it 65 years old in 2025.

What condition is Nd Highway 18 over Sheyenne 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 May 2023.

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

About 630 vehicles per day (2019 count), of which roughly 19% are trucks.

How long is Nd Highway 18 over Sheyenne River?

The structure is 155 ft (47.2 m) long with a longest span of 55 ft (16.8 m) and a deck 35 ft wide.

Who owns Nd Highway 18 over Sheyenne River?

It is owned by the State Highway Agency.