Flood — Pottawattamie, Iowa

2007-05-06 to 2007-05-07 · near Avoca, Pottawattamie, Iowa

Event narrative

Heavy rainfall over the weekend of May 4th through the 6th, caused the West Nishnabotna River to flood across Pottawattamie county. The West Nishnabotna River at Hancock crested around 20.5 feet between 1130 pm and midnight May 6th. Flood stage is 14 feet. The river at Hancock first crossed flood stage around 6 am cdt May 6th and didn't drop below flood stage until around 1 pm cdt on the 7th. The flooding affected farmland and many county roads in the area from around Avoca through Hancock. Some homes were also damaged.

Wider weather episode

Rainfall of 4 to 8 inches fell over much of eastern Nebraska and southwest Iowa over the weekend of May 4th, 5th and 6th, 2007. Besides causing localized flash flooding, the heavy rain also produced areas of prolonged river and creek flooding over the region.

Heavier 96 hour rain amounts ending Monday morning included...

Across eastern Nebraska...

7.46 inches at Omaha Eppley, 7.15 in Falls City, 6.91 at Bellevue, 5.03 in Syracuse, 4.94 at Auburn, 4.90 in Lincoln, 4.88 at Plattsmouth, 4.55 at Fairbury and 4.39 at the NWS in Valley.

Over western Iowa...

7.98 inches at Logan, 7.87 in Randolph, 7.52 in Shenandoah, 6.96 at Red Oak, 6.36 at Sidney, 6.32 in Onawa, 6.11 at Clarinda, 6.10 at Harlan and 6.04 at Oakland.

View location on OpenStreetMap → (41.5004, -95.3773)

Source: NOAA Storm Events Database, event_id 21960. Narrative written by the NWS forecast office that issued the report.