Flood Zones and the Sheyenne River in Eddy County, North Dakota

A 2023 FEMA map update specifically named Eddy County, New Rockford, and Sheyenne

On June 30, 2023, FEMA released preliminary Flood Insurance Rate Maps (FIRMs) and an accompanying Flood Insurance Study report showing updated flood hazard determinations for portions of Eddy County, specifically naming the cities of New Rockford (the county seat) and Sheyenne. FEMA describes these preliminary products as built from newer data and technology than the maps they're replacing -- but a preliminary map is not automatically the effective, legally-controlling map: FEMA's own guidance is that preliminary data cannot be used to rate flood insurance policies or to enforce the federal mandatory flood-insurance purchase requirement until it becomes effective.

For a buyer, that timing distinction matters. If you're evaluating a parcel near New Rockford or Sheyenne, don't rely on an older flood-zone designation without checking whether the 2023 preliminary map has since become effective for that specific location, since a parcel's flood-zone designation -- and therefore whether a lender will require flood insurance on a federally-backed mortgage -- can change between the preliminary and effective versions of a FIRM.

The Sheyenne is a 'perch river' -- a specific, documented reason floodwater here can spread wide

The Sheyenne River, which runs through Eddy County past the city of Sheyenne, is classified as a perch river: its banks sit higher than the surrounding ground rather than being cut down into it the way most rivers are. When floodwater does break through a perch river's banks, it isn't confined to a valley or floodplain the way water is on an incised channel -- it spreads out across the surrounding flatter land, which can put a wider area at practical flood risk than the officially mapped Special Flood Hazard Area might suggest for a channel of similar size elsewhere.

This is a genuine, physical reason to treat proximity to the Sheyenne with more caution than a generic 'how close to the river is the parcel' rule of thumb would suggest, particularly for land that sits just outside a mapped flood zone. It doesn't mean every low spot near the river will flood, but it does mean the practical flood risk from a Sheyenne breach can behave differently than risk from a river with normal, incised banks.

What to verify before buying near the river

1. Check FEMA's Map Service Center for the current effective FIRM panel covering the specific parcel, and separately ask whether the 2023 preliminary map for Eddy County has become effective for that location yet.
2. Ask Eddy County's floodplain administration (handled through the same office as county zoning) whether the parcel is inside a mapped Special Flood Hazard Area, and whether any building or floodplain development permit would be required before construction.
3. If a federally-backed mortgage is involved, confirm directly with the lender how the parcel's flood-zone status affects mandatory flood-insurance requirements -- this can change if the map update becomes effective after you've already begun the purchase process.
4. For land near the Sheyenne outside the officially mapped flood zone, ask a local contractor, the Recorder's office, or long-time neighbors about any documented history of flooding on or near the specific parcel, since a perch river's spread pattern is not always fully captured by a standard flood-zone map boundary.