US Bridges

US Highway 10 over Legal Drain 40

Fair

Cass County, North Dakota · 45th St. & Main Ave. · Structure no. 0010936658

Built
1931
94 years old, rebuilt 1956
Condition
Fair
inspected June 2024
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
21,900
2019 count
Owner
State
State Highway Agency

About this bridge

US Highway 10 over Legal Drain 40 is a concrete culvert carrying US Highway 10 over Legal Drain 40 in Cass County, North Dakota. It was built in 1931 and reconstructed in 1956, so it is 94 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 21,900 vehicles a day, roughly 8% of them trucks, projected to reach 21,900 by 2039. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesUS Highway 10
CrossesLegal Drain 40
Location45th St. & Main Ave.
RouteU.S. Route 10
CountyCass County
StateNorth Dakota
Coordinates46.87626, -96.86129
Functional classUrban Other Principal 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
Channel and channel protection8 Very GoodNo problems noted.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 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
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.2 US tons
Inventory rating31.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,900 (2019)
Projected traffic21,900 by 2039
Trucks8%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 US Highway 10 over Legal Drain 40 built?

It was built in 1931, making it 94 years old in 2025. It was reconstructed in 1956.

What condition is US Highway 10 over Legal Drain 40 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 June 2024.

How much traffic does US Highway 10 over Legal Drain 40 carry?

About 21,900 vehicles per day (2019 count), of which roughly 8% are trucks.

How long is US Highway 10 over Legal Drain 40?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).

Who owns US Highway 10 over Legal Drain 40?

It is owned by the State Highway Agency.