US Bridges

Nd Highway 18 over Swan Creek

Fair

Cass County, North Dakota · Casselton · Structure no. 0018074581

Built
1972
53 years old
Condition
Fair
inspected October 2024
Type
Slab
Concrete Continuous
Length
85 ft
3 main spans
Daily traffic
3,010
2019 count
Owner
State
State Highway Agency

About this bridge

Nd Highway 18 over Swan Creek is a concrete continuous slab carrying Nd Highway 18 over Swan Creek in Cass County, North Dakota. It was built in 1972, so it is 53 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 3,010 vehicles a day, roughly 7% of them trucks, projected to reach 2,539 by 2039. The structure is 85 ft (25.9 m) long and 45 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesNd Highway 18
CrossesSwan Creek
LocationCasselton
RouteState Highway 18
CountyCass County
StateNorth Dakota
Coordinates46.89091, -97.21177
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 alignment6: Equal to present minimum criteria
Operating rating80.2 US tons
Inventory rating48.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length85 ft (25.9 m)
Longest span32 ft (9.8 m)
Deck width45 ft (13.7 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,010 (2019)
Projected traffic2,539 by 2039
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 Swan Creek built?

It was built in 1972, making it 53 years old in 2025.

What condition is Nd Highway 18 over Swan Creek 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 October 2024.

How much traffic does Nd Highway 18 over Swan Creek carry?

About 3,010 vehicles per day (2019 count), of which roughly 7% are trucks.

How long is Nd Highway 18 over Swan Creek?

The structure is 85 ft (25.9 m) long with a longest span of 32 ft (9.8 m) and a deck 45 ft wide.

Who owns Nd Highway 18 over Swan Creek?

It is owned by the State Highway Agency.