Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
MADISON SOMERSET 20 1 0.89 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
7 m
(22 ft) 		4 m
(13 ft) 		572 ha
(1,413 ac) 		22,888,613 m3
(18,556 ac-ft) 		41 km2
(16 mi2)

Secchi Disk Transparency Graphs

Graph Legend: Secchi symbols = average Secchi Disk Transparency Values; tick marks = maximum and minimum values for each year.

Water Chemistry and Trophic State Parameters

Table Legend:

Color: Color (SPU), Alk: Alkalinity (mg/l CaCO3), SpCon: Specific Conductivity (\(\mu\)S/cm), pH: pH (standard units)

TP = Total Phosphorus (\(\mu\)g/L) – EC: Epilimnion Core, SG: Surface Grab, BG: Bottom Grab, PG: Profile Grab

SDT = Secchi Disk Transparency (m) – Min: minimum value, Avg: average value, Max: maximum value, n: number of months with Secchi readings per year, b: number of times Secchi disk was observed touching the bottom of the lake per year

Chl = Chlorophyll-a (\(\mu\)g/L) – Min: minimum value, Avg: average value, Max: maximum value
Year Color Alk SpCon pH TP-EC TP-SG TP-BG TP-PG SDT-Min SDT-Avg SDT-Max SDT-n SDT-b Chl-Min Chl-Avg Chl-Max
1970 6.6 6.8 7.0 4 4
1971 5.2 6.5 7.0 5 2
1972 15.0 5.5 6.0 6.4 7.0 4 1
1973 7.0 4.9 5.8 6.8 2
1978 14 62 4.7 5.4 6.2 5 1 2.2 2.2 2.2
1980 4.9 4.9 4.9 1 1
1981 15 48 10.0 3.1 4.1 5.4 3 2 4.1 4.1 4.1
1982 4.8 6.0 6.8 5 1
1983 3.8 5.0 6.5 7
1984 13 6.0 3.7 5.1 6.4 7 1 3.0 3.0 3.0
1985 4.8 5.8 6.6 8 1
1986 4.9 5.7 6.7 5
1987 18 50 8.0 4.1 5.9 7.1 7 4
1988 5.0 6.7 7.3 7 11
1989 4.1 5.3 6.9 6
1990 5.0 6.5 7.5 7 9
1991 25 60 7.1 7.0 3.7 6.0 7.3 6 3
1992 4.4 6.5 7.5 6 8
1993 4.2 6.0 7.2 5 2
1994 2.8 5.2 7.3 8 5
1995 4.8 6.2 7.1 8 4
1996 4.3 5.5 6.4 6
1997 18 66 7.4 7.0 3.9 6.0 7.2 8 8 3.2 3.2 3.2
1998 4.4 5.5 7.3 8 2
1999 3.9 5.3 7.2 7 4
2000 4.4 5.9 7.4 8 2
2001 4.8 5.9 7.0 6
2002 17 19 73 7.0 5.1 5.9 7.1 7 3.8 3.8 3.8
2003 6.0 4.4 6.1 7.3 5 2
2004 4.6 5.6 7.1 7
2005 15 7.3 6.0 4.0 5.7 6.8 9
2006 7.8 4.3 5.6 7.1 10
2007 13 16 60 7.5 7.0 6.0 6.5 7.2 7 2
2008 7.2 4.1 5.3 7.3 7 2
2009 7.0 4.6 6.0 7.3 7 3
2010 5.4 6.5 7.2 5 1
2011 9 9.0 7.0 4.8 5.5 6.9 8 6.0 6.0 6.0
2012 5.8 4.4 5.7 7.3 9 2
2013 6.0 4.5 5.7 7.4 6 1
2014 10.2 4.4 6.0 7.2 8 1
2015 4.7 5.0 6.4 7.2 10 3
2016 7.0 5.4 6.6 7.4 9 3
2017 12 19 80 7.5 8.0 8.0 4.1 5.2 6.4 8 4.6 4.6 4.6

Lake Chemistry and Trophic Summary Data - Overall Summary Values:

Avg Color Avg Alk Avg SpCon pH Avg TP-EC Avg TP-SG Avg TP-BG Avg TP-PG SDT-Min SDT-Avg SDT-Max SDT-n Chl-Min Chl-Avg Chl-Max
14 17 62 7.4 7.7 7.5 6.2 2.8 5.8 7.5 6.5 2.2 3.8 6

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2014-09-17
2016-08-12
2016-08-28
2016-09-10
2017-08-19
2017-08-23
2017-08-28
2017-09-08
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 18 8.2 25 7.5 24 7.2 24 7.5 23 7.1 23 8.4 23 7.2 19 7.9
1 18 8.2 25 7.5 24 7.3 24 7.5 22 7.2 23 8.4 22 7.2 19 7.9
2 18 8.2 25 7.4 24 7.3 24 7.5 22 7.2 23 8.3 22 72.0 19 7.9
3 18 8.2 24 7.3 24 7.2 24 7.5 22 7.1 23 8.2 22 7.2 19 7.8
4 18 8.2 24 6.9 24 7.2 24 7.5 22 7.1 23 7.7 22 7.1 19 7.8
5 18 8.2 24 6.4 24 6.5 23 7.1 22 7.0 23 7.9 22 7.1 19 7.8
6 18 8.2 24 6.3 23 4.9 22 5.8 22 6.9 22 7.3 22 7.1 19 7.8
7 18 8.2 23 4.7 22 5.2 22 6.7 22 6.9 22 7.1 19 7.8

Recent temperature and dissolved oxygen profile plots

Temperature (°C), Dissolved Oxygen (mg/L)