US Bridges

County Highway over Maple River/Drain 46

Fair

Cass County, North Dakota · 9 North 3 East Tower City · Structure no. 000000009104130

Built
1965
60 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
60 ft
1 main span
Daily traffic
70
2019 count
Owner
County
County Highway Agency

About this bridge

County Highway over Maple River/Drain 46 is a prestressed concrete stringer/multi-beam or girder carrying County Highway over Maple River/Drain 46 in Cass County, North Dakota. It was built in 1965, so it is 60 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 6 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 70 vehicles a day, projected to reach 60 by 2039. The structure is 60 ft (18.3 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesCounty Highway
CrossesMaple River/Drain 46
Location9 North 3 East Tower City
RouteCounty Highway 918
CountyCass County
StateNorth Dakota
Coordinates47.05067, -97.63257
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating64.4 US tons
Inventory rating36.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length60 ft (18.3 m)
Longest span57 ft (17.4 m)
Deck width28 ft (8.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic70 (2019)
Projected traffic60 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$62,000
NavigationNo navigation control on waterway

Frequently asked questions

When was County Highway over Maple River/Drain 46 built?

It was built in 1965, making it 60 years old in 2025.

What condition is County Highway over Maple River/Drain 46 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 August 2023.

How much traffic does County Highway over Maple River/Drain 46 carry?

About 70 vehicles per day (2019 count).

How long is County Highway over Maple River/Drain 46?

The structure is 60 ft (18.3 m) long with a longest span of 57 ft (17.4 m) and a deck 28 ft wide.

Who owns County Highway over Maple River/Drain 46?

It is owned by the County Highway Agency.