Branch Lake

Ellsworth, Hancock, Maine
MIDAS 4328

Secchi transparency (mean, maximum & minimum annual values)

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Branch Lake
MIDAS 4328 - Station 1
Year Depth - Meters Depth - Feet
Min Mean Max Min Mean Max
1974 9.5 7.4 6.4 31.2 24.2 21.0
1975 8.6 7.8 6.6 28.2 25.6 21.7
1976 9.5 7.4 6 31.2 24.2 19.7
1977 6.7 6.7 6.7 22.0 22.0 22.0
1978 n/a n/a n/a n/a n/a n/a
1979 n/a n/a n/a n/a n/a n/a
1980 11.5 9.0 6.5 37.7 29.4 21.3
1981 7 7.0 7 23.0 23.0 23.0
1982 n/a n/a n/a n/a n/a n/a
1983 n/a n/a n/a n/a n/a n/a
1984 9.2 7.8 6.5 30.2 25.4 21.3
1985 10 8.1 7.1 32.8 26.6 23.3
1986 8.4 7.7 7 27.6 25.3 23.0
1987 8.6 8.2 7.9 28.2 26.7 25.9
1988 9.5 9.5 9.5 31.2 31.2 31.2
1989 8.1 7.4 7 26.6 24.3 23.0
1990 8.5 7.2 6.1 27.9 23.7 20.0
1991 7.7 7.4 6.5 25.3 24.2 21.3
1992 n/a n/a n/a n/a n/a n/a
1993 n/a n/a n/a n/a n/a n/a
1994 n/a n/a n/a n/a n/a n/a
1995 10.3 9.4 8.2 33.8 30.8 26.9
1996 8.2 7.2 6.7 26.9 23.5 22.0
1997 10.1 8.5 6.2 33.1 28.0 20.3
1998 10.45 9.3 6.4 34.3 30.5 21.0
1999 10.54 9.7 8.7 34.6 31.9 28.5
2000 10.9 8.9 6.87 35.8 29.1 22.5
2001 10.91 9.4 8.66 35.8 30.7 28.4
2002 10.03 9.5 8.2 32.9 31.0 26.9
2003 10.35 9.7 8.7 34.0 31.8 28.5
2004 n/a n/a n/a n/a n/a n/a
2005 n/a n/a n/a n/a n/a n/a
2006 8.3 7.7 6.5 27.2 25.2 21.3
2007 9.7 8.5 7.2 31.8 27.8 23.6
2008 9.75 9.2 8.5 32.0 30.0 27.9
2009 9.6 8.5 7.1 31.5 27.9 23.3
2010 12 11.2 10.6 39.4 36.6 34.8
2011 11 9.4 8.35 36.1 30.9 27.4
2012 11.28 10.1 7.81 37.0 33.0 25.6
2013 11.58 10.1 8.35 38.0 33.0 27.4
2014 11.2 10.4 9.47 36.7 34.2 31.1
2015 12.24 10.6 8.9 40.2 34.7 29.2
2016 11.28 10.1 9.14 37.0 33.3 30.0
2017 11.45 10.2 8.53 37.6 33.5 28.0
2018 12.57 11.0 9.34 41.2 36.1 30.6
2019 n/a n/a n/a n/a n/a n/a
2020 10.67 9.7 8.84 35.0 31.7 29.0
2021 11.84 10.0 8.83 38.8 32.9 29.0
2022 14.1 10.9 8.81 46.3 35.9 28.9
2023 10.6 9.3 8.23 34.8 30.5 27.0
2024 11.6 10.0 8.35 38.1 32.7 27.4
2025 11.85 10.7 8.7 38.9 35.1 28.5


Understanding Transparency

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Source Data:
Maine Lakes Transparency, Color & Chemistry: Annual Mean Values

Date-specific Secchi data for this and other Maine lakes can be found HERE