Lake Conditions

DELAVAN LAKE DATA - August 21, 2019

a-2 Center:  Secchi Disc was 8 ft 0 in, Water Temp was 76.2 degrees, & Murky

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Normal Lake Level is 927.10 (Winter) and 927.86 (Summer)

The goal for the DNR for optimal lake level is 927.86

Lake Level on August 21, 2019 was 927.86

 

What is a Secchi Disc?  A Secchi disc is an 8-inch diameter metal disc painted in alternative black and white quadrants used to measure water clarity.  Water clarity is a quick way to estimate lake health, and it plays an important role in determining the types of plants and animals that a waterbody can support.

 

General Guidelines:

"Ice On"

In case the lake should be frozen in the morning, after a cold calm night, ut then breaks up in the afternoon with wind and sun, I don't count that as a freeze-up date.  However, if a lake freezes on one day, stays frozen for a few days, then breaks up for some days before a final freeze-up for the winter, I record all the freezing and opening dates so that I can determine the total number of days each winter that the lake was covered with ice - regardless of whether it is safe for walking.  In the simplest case, a lake may freeze on one day and then stay frozen all winter.  In some winters, however, the freeze-up process can be quite complex with multiple freezing and openings.

"Ice Off"

The lake is considered thawed when it is possible to boat from any shore to the deepest part of the lake without encountering ice.

2019

Ice On Date - 12/10/2018  Ice Off Date - 01/08/2019

Ice On Date - 01/11/2019  Ice Off Date - 03/27/2019

Total Days of Ice Coverage: 104 Days

HISTORICAL INFORMATION

WINTER DATE ICE ON DATE ICE OFF TOTAL DAYS OF ICE COVERAGE
2017-2018 12/26/2017 03/24/2018 88
2016-2017 12/18/2016 02/24/2017 68
2015-2016 01/11/2016 03/09/2016 58
2014-2015 01/02/2015 04/02/2015 90
2013-2014 12/16/2013 04/11/2014 116
2012-2013 01/22/2013 04/10/2013 78
2011-2012

02/10/2012

01/20/2012

03/11/2012

01/31/2012

30

11

2010-2011 12/17/2010 03/23/2011 96
2009-2010

12/29/2009

12/16/2009

03/25/2010

12/25/2009

86

9

2008-2009 12/16/2008 03/18/2009 92
2007-2008 12/20/2007 04/05/2008 107
2006-2007 01/17/2007 03/25/2007 67
2005-2006 12/07/2005 03/28/2006 111
2004-2005 12/25/2004 03/30/2005 95
2003-2004 01/09/2004 03/24/2004 75
2002-2003

01/14/2003

12/04/2002

03/28/2003

12/19/2002

73

15

2001-2002 01/02/2002 03/17/2002 74
2000-2001 12/13/2000 04/07/2001 115
1999-2000 01/20/2000 02/27/2000 38
1998-1999 12/30/1998 03/21/1999 81
1997-1998 01/11/1998 02/26/1998 46
1996-1997 12/26/1996 03/28/1997 92
1995-1996 12/16/1995 03/31/1996 106
1994-1995 01/10/1995 03/19/1995 68
1993-1994 12/23/1993 03/29/1994 96
1992-1993 12/24/1992 04/10/1993 107
1991-1992

12/16/1991

12/03/1991

03/09/1992

12/07/1991

84

4

1990-1991 12/26/1990 03/23/1991 87
1989-1990 12/07/1989 03/14/1990 97
1988-1989

12/26/1988

12/12/1988

03/29/1989

12/22/1988

93

10

1987-1988 12/27/1987 03/25/1988 89
1986-1987 12/13/1986 03/16/1987 93
1985-1986 12/21/1985 03/28/1986 97
1984-1985 01/04/1985 03/27/1985 82
1983-1984 12/19/1983 04/04/1984 107