US Bridges

County Highway over Tributary Maple River

Fair

Cass County, North Dakota · 1 North of Lynchburg · Structure no. 000000009121320

Built
1985
40 years old
Condition
Fair
inspected July 2023
Type
Slab
Wood or Timber
Length
88 ft
3 main spans
Daily traffic
100
2019 count
Owner
County
County Highway Agency

About this bridge

County Highway over Tributary Maple River is a wood or timber slab carrying County Highway over Tributary Maple River in Cass County, North Dakota. It was built in 1985, so it is 40 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 100 vehicles a day, roughly 10% of them trucks, projected to reach 100 by 2039. The structure is 88 ft (26.8 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCounty Highway
CrossesTributary Maple River
Location1 North of Lynchburg
RouteCounty Highway 0
CountyCass County
StateNorth Dakota
Coordinates46.78464, -97.26342
Functional classRural Local

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating43.2 US tons
Inventory rating30.6 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 20 + Mod
Structure length88 ft (26.8 m)
Longest span31 ft (9.4 m)
Deck width30 ft (9.2 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2019)
Projected traffic100 by 2039
Trucks10%
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 Tributary Maple River built?

It was built in 1985, making it 40 years old in 2025.

What condition is County Highway over Tributary 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 Tributary Maple River carry?

About 100 vehicles per day (2019 count), of which roughly 10% are trucks.

How long is County Highway over Tributary Maple River?

The structure is 88 ft (26.8 m) long with a longest span of 31 ft (9.4 m) and a deck 30 ft wide.

Who owns County Highway over Tributary Maple River?

It is owned by the County Highway Agency.