Blog · Water risk

Flood protection is being built. The flood map gap remains.

· 3 min read

North Dakota is in the middle of its largest flood-protection building programme in a generation. Minot's project has passed the halfway mark in state funding, and the Fargo-Moorhead diversion is in its final stages of construction. What has not caught up is the map most outside systems use to see flood risk: 18 of the state's 53 counties still have no countywide map in FEMA's digital flood layer, and Ward County, home of Minot, is one of them.

What is being built

In Minot, the Mouse River Enhanced Flood Protection Project was designed around the 2011 flood, which peaked at about 27,000 cubic feet per second. The Minot Daily News reported in May that once its Maple Diversion segment is finished, it will "remove 60% of valley residents from the flood plain". In February, the State Water Commission awarded the project $81.1 million for 2025 to 2027, bringing state approvals to about $470.6 million, with around $40 million more from Minot's city sales tax.

In the Red River valley, the Fargo-Moorhead diversion reached major milestones in August: all 19 crossings over its 30-mile channel are complete, and the Sheyenne River now flows through its aqueduct over the channel.

These are serious, expensive answers to real floods. Flood insurance paid $97.4 million in North Dakota in 1997 and $96.6 million in 2011, the two largest years on record. We covered that history in what North Dakota's flood claims show.

The part a levee cannot fix

A levee protects people. It does not, by itself, tell a lender, an insurer or a buyer where risk is. For that, most software reads FEMA's digital flood map, and in much of North Dakota there is not one to read.

Fourteen counties have no digital flood map at all, and four more are mapped only around some towns. Together they hold 195,970 of the state's 732,016 buildings. Ward County is the clearest example: no countywide digital map, yet 1,107 flood insurance claims and $69.5 million paid since 1978, $66.9 million of it in 2011 alone. The full list is in 18 North Dakota counties have no countywide digital flood map.

The state does publish approximate floodplains for planning, but they are not the regulatory map that lending and insurance rules follow. When a new levee or diversion is finished, the official map does not change on its own. Maps are revised through their own process, and until then, what outside systems see can lag behind what has been built on the ground.

Why this matters now

Three groups feel the gap first.

  • Homeowners and buyers rely on the map to decide whether flood insurance is required, and many assume "not in a mapped zone" means "safe".
  • Lenders and insurers price and approve loans from the same map. Where there is no digital map, they are pricing blind or relying on older paper records.
  • Counties see their risk reflected, or not reflected, in decisions made far away.

Protection projects are measured in years and billions. Knowing which buildings sit where, and how often they have flooded before, is much cheaper, and it can be done now.

What Prism Labs is doing

We are building Prism Water Risk: flood and water risk for insurers, lenders and counties in North Dakota, in development. It starts from the public record, keeps a receipt for every record, and re-counts every source against the original files before anything is built on it. That is how we know the numbers in this post, down to the building. The seven steps behind it are the same ones every Prism product follows.

If you lend, insure or plan in North Dakota and want to see this for your own county or portfolio, request a pilot.

This product is not endorsed by FEMA.

Sources

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