US Bridges

County Highway over Maple River

Fair

Cass County, North Dakota · 1 North of Mapleton · Structure no. 000000009131240

Built
1994
31 years old
Condition
Fair
inspected July 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
171 ft
3 main spans
Daily traffic
390
2019 count
Owner
County
County Highway Agency

About this bridge

County Highway over Maple River is a prestressed concrete continuous box beam or girders - single or spread carrying County Highway over Maple River in Cass County, North Dakota. It was built in 1994, so it is 31 years old, younger 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 390 vehicles a day, roughly 15% of them trucks, projected to reach 390 by 2039. The structure is 171 ft (52.1 m) long and 37 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCounty Highway
CrossesMaple River
Location1 North of Mapleton
RouteCounty Highway 0
CountyCass County
StateNorth Dakota
Coordinates46.90534, -97.05278
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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.5 US tons
Inventory rating29.2 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length171 ft (52.1 m)
Longest span54 ft (16.5 m)
Deck width37 ft (11.4 m)
Roadway width37 ft (11.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic390 (2019)
Projected traffic390 by 2039
Trucks15%
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 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 County Highway over Maple River built?

It was built in 1994, making it 31 years old in 2025.

What condition is County Highway over Maple 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 July 2023.

How much traffic does County Highway over Maple River carry?

About 390 vehicles per day (2019 count), of which roughly 15% are trucks.

How long is County Highway over Maple River?

The structure is 171 ft (52.1 m) long with a longest span of 54 ft (16.5 m) and a deck 37 ft wide.

Who owns County Highway over Maple River?

It is owned by the County Highway Agency.