US Bridges

County Highway over Shell Creek

Fair

Mountrail County, North Dakota · 6 North Parshall · Structure no. 000000031134350

Built
1990
35 years old
Condition
Fair
inspected June 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
81 ft
2 main spans
Daily traffic
20
2018 count
Owner
County
County Highway Agency

About this bridge

County Highway over Shell Creek is a prestressed concrete continuous box beam or girders - single or spread carrying County Highway over Shell Creek in Mountrail County, North Dakota. It was built in 1990, so it is 35 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 20 vehicles a day, projected to reach 20 by 2038. The structure is 81 ft (24.7 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesCounty Highway
CrossesShell Creek
Location6 North Parshall
RouteCounty Highway 0
CountyMountrail County
StateNorth Dakota
Coordinates48.04914, -102.13795
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.1 US tons
Inventory rating24.6 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length81 ft (24.7 m)
Longest span38 ft (11.6 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2018)
Projected traffic20 by 2038
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Highway over Shell Creek built?

It was built in 1990, making it 35 years old in 2025.

What condition is County Highway over Shell Creek 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 County Highway over Shell Creek carry?

About 20 vehicles per day (2018 count).

How long is County Highway over Shell Creek?

The structure is 81 ft (24.7 m) long with a longest span of 38 ft (11.6 m) and a deck 31 ft wide.

Who owns County Highway over Shell Creek?

It is owned by the County Highway Agency.