The USGS provides practical, unbiased information about the Nation's rivers and streams that is crucial in mitigating hazards associated with floods. This site provides information about the USGS activities, data, and services provided during regional high-flow events, such as hurricanes or multi-state flooding events. The USGS response to these events is typically managed by the National Floods Specialist.
More than 12 inches of rain fell in northeast Iowa, southeast Minnesota, and southwest Wisconsin during a 24-hour period on September 22 and 23, 2016. Wisconsin streamgages saw floods in the 10- to 100-year range.
Streams in Iowa experienced major flooding, forcing evacuations of communities in the Cedar River basin, particularly along the Shell Rock River. 24 USGS streamgages exceeded the National Weather Service (NWS) flood stage in Iowa, with annual exceedance probabilities at less than 1% (greater than a 100-year flood). State disaster declarations were made for 13 Iowa counties. USGS personnel in Iowa installed backup stage sensors and a temporary streamgage to maintain the flow of data during this event.
Initial news reports in Minnesota included many inundated or washed out roads south of the Twin Cities from Waseca to Kenyon along the Zumbro River. There were also reports of mudslides. The USGS Minnesota Water Science Center dispatched crews to make discharge measurements and collect sediment samples.
USGS Crews Measure Flooding in Northeast Iowa (9/23/2016) U.S. Geological Survey field crews are measuring flooding on the Cedar River and Shell Rock River in Northeast Iowa. High-flow measurements on these rivers are approaching levels observed in 2008...
The Gazette (9/26/2016): USGS uses arsenal of river tools to monitor, predict water levels Gauges installed since 2008 help with accuracy, precision.