Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
WINTHROP KENNEBEC 12 1 1.5 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
16 m
(54 ft) 		7 m
(22 ft) 		90 ha
(222 ac) 		6,106,409 m3
(4,951 ac-ft) 		10 km2
(4 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
1976 9.2 4.7 6.1 8.3 7 1.5 3.4 7.3
1977 5.0 5.5 6.2 9.1 3 5.6 5.6 5.6
1978 17.0 4.0 5.2 6.0 4 1.2 1.4 2.0
1979 11.9 5.4 6.0 6.9 7 2.5 4.3 10.3
1980 9.2 5.0 5.7 6.4 5 1.9 2.5 3.2
1981 11.5 11.7 3.4 5.2 6.5 5 2.3 3.7 6.6
1982 9.0 12.7 4.5 6.4 7.6 8 2.2 3.0 5.4
1983 10.0 3.9 5.3 6.0 5 2.3 3.3 5.8
1984 3.0 5.0 6.9 5
1985 78 13.3 2.5 5.6 7.5 8 2.2 4.2 8.3
1986 8.0 9 4.2 5.6 7.4 6 1.8 1.8 1.8
1987 16 9.9 4.5 6.2 7.5 6 1.7 2.9 3.7
1988 15 10.0 4.6 6.2 7.5 6
1989 4.0 5.0 6.0 4
1990 17 7.0 4.0 5.3 7.5 8
1991 17 6.9 10.2 4.5 5.6 7.0 6 3.4 5.1 6.3
1992 16 7.0 3.6 5.5 7.0 7 2.9 4.5 5.6
1993 17 7.0 6.0 5.0 6.3 7.5 7 1.9 1.9 2.0
1994 16 6.9 8.0 4.2 6.2 7.9 7 3.5 4.7 8.0
1995 5.4 6.9 8.3 8
1996 3.5 5.4 6.5 8
1997 18 6.9 8.4 5.3 6.4 7.3 9 2.1 2.6 3.6
1998 18 6.8 9.3 3.3 5.3 6.6 9 6.1 10.9 15.4
1999 9.0 5.0 6.4 7.7 12 4.4 4.4 4.4
2000 14 6.9 9.5 4.7 6.0 7.2 8 3.3 4.1 4.6
2001 14 7.0 8.0 21.5 4.8 6.7 7.7 6 6.3 6.3 6.3
2002 15 120 6.9 9.6 21.0 11.8 4.2 6.1 7.6 8 1.9 4.2 6.6
2003 19 7.1 18.7 5.0 6.7 8.1 6 2.5 4.6 7.2
2004 4.9 5.9 6.8 7
2005 4.3 5.8 7.1 6
2006 19 19 96 6.9 15.7 3.0 5.3 6.3 5 4.0 5.3 7.0
2007 3.8 6.5 7.7 9
2008 6.0 7.1 7.7 6
2009 20 7.2 5.3 6.6 8.7 7 1.3 2.4 3.8
2010 6.7 7.7 8.4 6
2011 5.0 5.6 6.2 4
2012 20 10.6 4.6 6.0 6.9 6 2.8 5.4 13.0
2013 20 8.8 10.2 5.0 5.8 6.5 6 2.7 4.9 7.5
2014 18 20 96 7.0 8.4 9.2 5.5 6.1 6.8 5 2.5 5.6 12.0
2015 19 8.6 28.6 5.6 6.3 6.8 4 2.9 7.3 12.0
2016 20 9.3 4.3 6.5 7.6 6 2.1 3.5 6.2
2017 20 7.8 72.0 5.0 6.3 7.3 6 2.3 4.5 7.7

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
18 18 98 6.9 9.1 9 27 12 2.5 6 9.1 6.5 1.2 4.3 15

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2013-09-18
2014-08-19
2014-08-28
2015-08-27
2016-08-15
2016-09-22
2017-08-29
2017-09-28
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 20.0 8.2 23.6 8.1 25.4 8.2 25.3 7.9 26.2 8.1 22.7 8.3 22.8 8.5 23.0 9.5
1 19.7 8.2 23.2 8.2 25.4 8.1 25.3 7.9 26.0 8.0 22.3 8.3 22.8 8.4 23.0 9.6
2 19.5 8.2 22.2 8.1 24.1 8.7 24.8 8.0 25.1 8.1 22.0 8.4 22.7 8.5 21.4 10.1
3 18.8 7.9 22.0 8.1 22.9 8.7 24.7 8.0 24.5 8.1 21.7 8.4 22.5 8.5 20.7 10.3
4 18.7 7.9 21.8 7.9 21.3 8.7 24.4 8.1 24.3 8.1 21.5 8.5 22.5 8.5 20.3 10.3
5 18.6 7.7 20.2 6.4 19.1 8.6 20.5 10.3 23.2 8.8 21.1 8.4 21.5 9.4 19.8 10.3
6 17.2 6.6 15.2 10.4 14.7 8.3 14.9 10.2 16.1 12.0 20.8 8.5 15.9 9.4 17.8 10.5
7 13.5 2.5 10.2 6.4 11.6 6.1 12.0 8.5 13.0 9.8 16.6 8.5 9.3 6.4 12.5 8.2
8 11.1 3.3 8.8 5.8 9.6 5.4 9.3 6.0 10.9 7.8 11.4 5.4 7.3 4.1 10.4 7.1
9 9.1 3.4 7.5 5.2 8.0 5.1 7.6 4.5 9.4 6.4 9.5 3.0 6.5 3.1 7.8 5.1
10 8.3 2.4 6.9 4.8 6.9 4.5 6.7 2.9 8.6 5.0 8.6 1.7 6.2 2.5 6.7 3.3
11 7.8 1.4 6.6 4.3 6.6 3.8 6.5 2.0 8.1 3.7 8.2 0.7 6.0 2.1 6.4 1.8
12 7.5 1.2 6.5 3.5 6.4 3.1 6.3 1.3 7.9 2.9 8.0 0.7 5.8 1.7 6.1 0.8
13 7.4 0.7 6.4 3.4 6.3 2.8 6.3 1.2 7.8 2.5 7.9 0.7 5.8 1.3 6.0 0.3
14 7.4 0.8 6.3 3.1 6.2 2.6 6.2 1.0 7.7 1.8 7.7 0.7 5.7 0.9 6.0 0.3
15 7.3 0.5 6.3 2.5 6.2 1.7 6.1 0.9 7.6 0.7 7.6 0.8 5.7 0.2 5.9 0.2
16 7.3 0.3 6.2 1.3 6.1 0.9 7.5 0.6 7.5 0.7 5.6 0.1 5.8 0.2
17 7.2 0.3 6.2 0.7 6.0 0.8 7.5 0.6 7.5 0.7 5.6 0.1 5.8 0.2
18 7.2 0.2 6.2 0.5 6.0 0.8 7.3 0.6 7.4 0.8 5.7 0.2

Recent temperature and dissolved oxygen profile plots

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