Humboldt County, IA
Flood Zones in Humboldt County, Iowa
In June 2024, the West Fork Des Moines River at Humboldt broke a 55-year-old flood record, while the East Fork crested near 22 feet the same week. Here is what that record event means for evaluating flood risk on a specific parcel.
This page covers what's specific to Humboldt County. For the general explanation, see the national guide.
June 2024: a record crest on the West Fork Des Moines River
Heavy rainfall across far northern and northwestern Iowa, plus southern Minnesota and parts of South Dakota, drove the Des Moines River system to historic levels in late June 2024. At the National Weather Service's gauge for the West Fork Des Moines River at Humboldt, the river reached a new record crest of 16.99 feet on June 27, 2024. That broke the prior all-time record of roughly 15 feet 4 inches, set in 1969 -- a record that had stood through more than five decades of Iowa weather, including the widespread and severe 1993 Midwest flood. Early river-stage reports on June 24-25 already described a "historic level" in the 15.9-foot range before the river continued rising to its eventual record crest a few days later.
The East Fork Des Moines River, which also runs through the county and meets the West Fork near Humboldt and Dakota City, crested at nearly 22 feet during the same event and flooded Dakota City's park. Dakota City itself, the county seat, sits on relatively high ground and was reported as generally unaffected by flooding even at that elevated crest stage -- but residents along River Drive, closer to the water, built sandbag levees, and some sheds and docks along the river took on water.
What this means for evaluating a specific parcel
A flood record that stood for 55 years and then was broken by more than a foot and a half in a single event is a meaningful signal: it suggests that older flood studies, FIRM panels drawn up before 2024, or a seller's or neighbor's account of "it's never flooded here" may understate current risk for property near either the West Fork or East Fork Des Moines River in this county. Because Iowa's floodplain mapping is periodically updated in response to significant events like this one, ask the county Zoning Administrator's office directly whether the FEMA Flood Insurance Rate Map covering a specific parcel has been revised or is under review following the June 2024 event, rather than relying on an older printed or downloaded map without checking its currency.
Elevation relative to the river -- not simply distance from the county seat or from a town center -- is the more useful way to think about risk here, given that Dakota City's high ground fared differently than lower-lying land along River Drive during the same event. If you're evaluating a parcel near either fork of the Des Moines River, request a site-specific elevation certificate and the current FIRM panel for that parcel, and ask the Zoning Administrator's office whether a floodplain development permit would be required for your intended use before you buy. We were not able to confirm, in this research pass, whether Humboldt County received a federal disaster declaration specific to the June 2024 event, the total scope of property damage, or a specific updated FIRM revision timeline -- confirm all three directly with the county and with FEMA's Map Service Center before relying on this page for a transaction decision.
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- West Fork Des Moines River at Humboldt (HBTI4) — National Weather Service / NOAA (accessed 2026-09)
- Historic flooding impacts Humboldt County — The Humboldt Independent (accessed 2026-09)
- Humboldt residents worry about power, water as Des Moines River reaches historic level — AOL / wire reporting (accessed 2026-09)
- Iowa floodwaters breach levees as even more rain forecast for drenched Midwest — KWWL / Gray Media (12 on Your Side) (accessed 2026-09)
- Des Moines River gages — WHO 13 (Des Moines) (accessed 2026-09)
- Zoning — Humboldt County, Iowa Government (accessed 2026-09)
Last reviewed 2026-09