Water Year Data Summaries

The Water Year Data Summary is a publication which was prepared by the DNR Division of Waters. Past publications (in 1979, 1980, 1991, 1993, 1995, 1997, 1999, 2001, 2003, 2005, 2007 and 2009) provided a review and summary of basic hydrologic data gathered through DNR Waters programs during the previous Water Year(s) (a water year is defined as the 12-month period October 1 through September 30 of the following year). The four major areas of data collection included climatology, surface water, ground water, and water use.

New Reports

New online data reports are now available that were not available in past years, making a biennial Water Year Data Summary Report redundant:

Monthly Hydrologic Conditions
The report places current values of precipitation, stream flows, lake levels and ground water levels in historical context.

Water Availability Assessment Report PDF icon
Published at the end of 2010 (and every 5 years thereafter), this report provides a review of the current state of our water resources relative to the quantities and trends of our water supplies.

Lake Level Summaries
One important element of the more recent online versions of the report include the extensive lake level summaries-tables which display fluctuations, spring and fall elevations, ranges, reported highest and lowest lake levels and their dates, and averages for selected lakes grouped by county. Because these summaries are not included in the two reports listed above, it is our intent to provide them separately. Tables from the 2009 report can be found here Excel document. The 2011 tables (summarizing the 2009 and 2010 Water Years) will be available as soon as the data is collected and sorted.

Ground Water: County Atlas - Regional Assessment Program
This program produces maps and reports depicting the characteristics and pollution sensitivity of Minnesota's ground water resources.