FloodZoneMap.org

Flood — Polk, IA

Mar 12, 2007

The March 1st blizzard, combined with very heavy snow from another storm on February 23-25, resulted in a snow cover of 20 to 30 inches over much of northern Iowa. Temperatures suddenly warmed after the 8th of the month over the south half of the state, and by the 9th and 10th across the north. The snow pack held 3-5 inches of water and this would become a problem when temperatures warmed in the middle of the month. The last of the snow cover did not melt until the 22nd. Ice covered nearly al

Source: NOAA National Weather Service Storm Events Database (event 15700). Narrative written by NWS staff at the time of the event.

Flood Risk Context for Polk, IA

This event is one of many recorded floods in Polk County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.

View Polk County flood data →

More Flood Stories

Flash Flood1 death$100K damage

Polk, IA · Aug 11, 2010

Once again the atmosphere over Iowa became very unstable during the peak heating of the day. CAPE rose to 3500-4500 J/kg by the mid to late afternoon with lifted indices of -8 to -10 C.

Read the full account →
Flash Flood1 death$1.0M damage

Polk, IA · Jun 30, 2018

A frontal boundary was draped across areas just west of Iowa during the morning hours of June 30th, and slowly moved eastward into the state throughout the day.

Read the full account →
Flash Flood1 death$30K damage

Polk, IA · Feb 19, 1997

Significant ice jams took place along the Raccoon River along its lower reaches. One occurred where the river flows through a gravel pit on the west side of the Des Moines area. A woman was driving across a flood plain road when one of the ice jams suddenly broke.

Read the full account →
Flash Flood$20K damage

Polk, IA · Jul 20, 2025

Diurnally driven afternoon storms on Sunday, July 20th, 2025, developed within an unstable environment with CAPE values over 3000 J/kg and 40 to 45 kts of effective shear.

Read the full account →