US Bridges

County Highway over CO Drain 15

PoorPosted for load

Cass County, North Dakota · 1 East 3 North Leonard · Structure no. 000000009124370

Built
1955
70 years old, rebuilt 1977
Condition
Poor
inspected July 2023
Type
Slab
Wood or Timber
Length
28 ft
1 main span
Daily traffic
20
2019 count
Owner
County
County Highway Agency

About this bridge

County Highway over CO Drain 15 is a wood or timber slab carrying County Highway over CO Drain 15 in Cass County, North Dakota. It was built in 1955 and reconstructed in 1977, so it is 70 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 20 vehicles a day, projected to reach 20 by 2039. The structure is 28 ft (8.5 m) long and 25 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesCounty Highway
CrossesCO Drain 15
Location1 East 3 North Leonard
RouteCounty Highway 0
CountyCass County
StateNorth Dakota
Coordinates46.70191, -97.22035
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating36.3 US tons
Inventory rating25.2 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadH 10
Structure length28 ft (8.5 m)
Longest span26 ft (7.9 m)
Deck width25 ft (7.5 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2019)
Projected traffic20 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Highway over CO Drain 15 built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 1977.

What condition is County Highway over CO Drain 15 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2023.

How much traffic does County Highway over CO Drain 15 carry?

About 20 vehicles per day (2019 count).

How long is County Highway over CO Drain 15?

The structure is 28 ft (8.5 m) long with a longest span of 26 ft (7.9 m) and a deck 25 ft wide.

Who owns County Highway over CO Drain 15?

It is owned by the County Highway Agency.