Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
WINTHROP KENNEBEC 12 1 1.07 flushes/yr 165 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
30 m
(100 ft)
7 m
(24 ft)
2,119 ha
(5,236 ac)
157,109,008 m3
(127,370 ac-ft)
84 km2
(32 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
1975 4.0 4.0 4.0 1
1976 16 1.8 3.5 6.5 6 2.7 7.5 18.8
1977 21 48 17 21 20 0.5 3.5 7.2 9 1.5 11.0 18.9
1978 2.0 3.9 5.0 7 1.5 7.3 14.6
1979 21 2.1 4.0 6.2 9 1.8 8.9 18.8
1980 17 22 1.6 4.4 6.8 9 3.7 9.0 21.4
1981 20 1.5 3.8 6.3 10 2.2 8.1 22.6
1982 16 16 3.6 4.6 5.9 7 2.9 5.6 10.1
1983 18 70 22 1.6 3.6 4.8 8 3.8 8.2 19.7
1984 50 22 1.9 3.5 5.5 6 4.7 9.9 16.7
1985 47 17 2.0 4.2 7.0 7 3.4 10.2 20.3
1986 17 2.6 4.3 5.1 7 3.9 6.6 8.6
1987 15 17 2.2 3.5 4.5 6 4.5 5.8 7.6
1988 18 15 1.7 4.0 5.9 6 3.6 7.8 13.0
1989 2.3 4.0 5.5 6 4.6 5.3 6.7
1990 19 54 7.1 18 25 1.7 3.6 6.0 6
1991 17 7.0 20 28 20 1.9 3.7 6.0 5 4.4 12.9 19.6
1992 17 7.1 1.4 2.4 3.2 6 9.5 19.4 34.4
1993 18 7.0 32 1.8 2.6 4.4 6 6.5 14.8 22.3
1994 17 7.0 29 1.9 3.4 6.0 7 6.9 14.1 22.5
1995 16 6.9 26 2.3 4.2 6.5 6
1996 22 1.9 3.5 5.1 6 4.4 8.1 12.6
1997 19 6.9 19 16 2.5 3.8 5.9 10 6.9 10.3 16.0
1998 17 2.4 3.9 5.8 9 4.8 9.4 14.5
1999 10 12 17 2.5 3.8 6.2 11 5.8 11.3 13.7
2000 16 6.9 16 2.6 4.3 5.7 7 3.9 8.2 12.7
2001 16 7.0 18 15 2.6 4.3 7.0 6 6.8 12.3 15.2
2002 15 6.9 16 2.7 4.6 7.4 6 3.6 9.1 17.2
2003 8 18 7.1 22 2.8 4.4 5.5 10 4.7 7.9 10.8
2004 15 7.0 30 2.8 4.7 6.6 6 3.7 7.7 13.3
2005 13 6.9 19 2.4 3.5 5.4 6 6.5 9.5 13.7
2006 10 20 81 7.0 19 2.5 4.3 6.1 7 4.7 7.7 14.0
2007 19 7.1 18 19 2.4 4.0 5.5 6 4.8 6.7 14.0
2008 8 20 81 7.0 12 18 16 2.4 3.6 5.9 7 5.2 9.8 15.0
2009 21 27 17 1.7 3.6 5.0 8 6.8 10.3 18.0
2010 20 18 24 20 2.2 4.7 6.7 8 3.4 8.8 16.0
2011 20 13 17 2.5 4.2 6.3 6 3.8 7.0 11.0
2012 22 17 3.3 5.2 6.5 9 3.4 7.1 12.0
2013 22 13 29 22 2.0 3.8 7.2 9 1.9 8.7 16.0
2014 13 21 77 7.4 17 17 18 2.9 5.0 6.8 9 3.8 10.9 25.0
2015 21 16 27 19 3.7 5.2 6.3 9 7.0 8.2 12.0
2016 21 12 40 18 4.7 6.5 8.4 10 2.1 3.6 6.5
2017 21 18 41 22 2.2 5.2 7.5 9 3.8 9.0 14.0
2018 7 21 98 7.9 14 41 21 3.1 5.3 7.6 11 4.0 7.0 10.0

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
9.2 19 67 7 16 27 20 0.5 4.1 8.4 7.4 1.5 9.1 34

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2016-08-24
2016-09-07
2017-08-09
2017-09-07
2018-08-08
2018-08-15
2018-08-23
2018-09-05
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 24.1 8.0 23.8 8.2 23.7 8.2 19.8 9.9 28.0 9.2 25.6 9.1 24.2 8.7 25.4 8.6
1 23.9 7.9 23.8 8.1 23.7 8.2 19.8 9.9 27.6 9.1 25.7 9.1 24.2 8.8 25.3 8.7
2 23.9 7.9 23.2 8.1 23.6 8.2 19.7 9.9 27.0 9.6 25.7 9.0 24.2 8.7 25.0 8.7
3 23.8 7.9 23.1 8.1 23.6 8.2 19.7 9.8 26.8 9.8 25.7 9.0 24.1 8.8 24.5 8.8
4 23.6 7.9 23.1 8.0 23.5 8.2 19.7 9.8 26.3 9.7 25.6 8.9 24.0 8.7 24.3 8.5
5 23.5 7.9 22.9 8.0 23.1 8.1 19.6 9.8 25.3 9.1 25.6 8.8 24.0 8.7 24.0 8.1
6 23.5 7.8 22.9 7.9 23.0 8.0 19.6 9.7 24.7 8.0 25.6 8.8 23.9 8.7 23.6 7.3
7 22.6 5.7 22.7 7.5 18.9 3.6 19.6 9.7 23.4 6.4 22.0 3.0 20.9 2.4 22.8 5.6
8 19.0 1.6 20.9 3.4 16.7 2.2 19.6 9.5 18.6 0.7 18.5 0.6 18.4 0.2 20.4 2.4
9 16.2 0.5 17.8 0.4 14.0 1.1 18.8 7.3 14.8 0.2 15.2 0.5 15.2 0.2 15.8 0.3
10 14.9 0.5 15.1 0.4 13.4 1.0 14.5 0.2 12.8 0.2 13.6 0.5 13.3 0.2 13.9 0.3
11 13.9 0.4 14.1 0.4 12.9 1.1 13.7 0.2 12.2 0.3 12.7 0.5 12.5 0.2 12.6 0.3
12 13.4 0.4 13.7 0.4 12.5 1.3 13.0 0.2 11.7 0.8 12.2 0.5 12.0 0.2 12.1 0.3
13 13.1 0.4 13.4 0.4 12.0 1.6 12.5 0.2 11.4 1.0 11.7 0.7 11.5 0.3 11.6 0.3
14 12.4 0.4 12.6 0.4 11.6 1.6 11.9 0.2 10.8 1.2 11.2 0.8 10.9 0.4 11.1 0.3
15 11.7 0.5 12.0 0.4 11.1 1.6 11.2 0.2 10.1 1.2 10.5 0.8 10.2 0.4 10.3 0.4
16 11.3 0.6 11.3 0.4 10.6 1.3 10.7 0.1 9.5 1.1 9.5 0.4 9.8 0.4
17 10.9 0.6 10.9 0.4 10.1 1.2 10.3 0.1 9.1 1.6 9.8 0.8 9.3 0.4 9.5 0.4
18 10.7 0.6 10.7 0.4 9.9 1.0 10.0 0.1 8.9 1.3 9.1 0.4 9.2 0.4
19 10.6 0.6 10.5 0.4 9.7 1.0 9.9 0.1 8.8 1.2 9.1 0.8 8.9 0.4 9.0 0.4
20 10.5 0.6 10.4 0.4 9.6 0.9 9.6 0.1 8.6 1.0 8.8 0.4 8.7 0.4
21 10.3 0.6 10.3 0.4 9.5 0.6 9.5 0.1 8.5 0.9 8.9 0.7 8.6 0.4 8.6 0.4
22 10.2 0.6 10.2 0.4 9.4 0.5 9.3 0.1 8.4 0.6 8.5 0.4 8.5 0.4
23 10.0 0.6 10.1 0.4 9.3 0.4 9.3 0.1 8.3 0.4 8.6 0.4 8.5 0.4 8.4 0.4
24 9.9 0.6 10.0 0.4 9.1 0.3 9.2 0.1 8.2 0.3 8.3 0.4 8.4 0.4
25 9.9 0.6 9.9 0.4 9.1 0.3 9.1 0.1 8.2 0.3 8.4 0.4 8.3 0.4 8.3 0.4
26 9.8 0.5 9.8 0.4 9.0 0.3 9.0 0.1 8.1 0.3 8.2 0.4 8.3 0.4
27 9.8 0.5 9.8 0.4 9.0 0.3 8.9 0.1 8.1 0.3 8.2 0.4 8.2 0.4
28 9.7 0.5 9.7 0.4 8.8 0.3 8.8 0.0 8.1 0.3 8.2 0.4 8.1 0.3 8.2 0.4
29 9.7 0.5 9.6 0.4 8.7 0.3 8.8 0.0 8.1 0.3

Most recent temperature and dissolved oxygen profile plots

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