Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
WINTHROP KENNEBEC 12 2 3.37 flushes/yr 210 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
36 m
(118 ft) 		8 m
(27 ft) 		241 ha
(595 ac) 		8,072,860 m3
(6,545 ac-ft) 		33 km2
(13 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 14 3.4 4.6 6.1 7 1.9 4.8 8.8
1978 13 4.2 4.9 5.8 5 1.3 2.8 4.7
1979 12 3.7 4.7 6.4 6 3.4 5.5 10.0
1980 2.3 2.3 2.3 1 5.1 5.1 5.1
1981 16 38 3.6 4.4 5.3 5 2.1 4.0 6.2
1982 10 26 4.5 5.0 5.5 7 2.4 3.5 4.6
1983 8 3.6 4.2 4.9 6 3.2 4.8 6.8
1984 3.8 4.7 5.6 5
1985 50 3.9 4.9 5.6 6 2.5 2.5 2.5
1986 14 4.0 4.5 5.4 6
1987 9.8 12 4.4 5.0 5.8 5
1988 4.3 4.8 5.5 6
1989 3.2 3.9 5.1 4
1990 17.8 7.0 16 3.3 4.5 5.3 6 3.4 5.2 8.8
1991 16.8 6.9 3.0 4.5 5.7 5
1992 15.9 58 7.0 3.5 4.7 6.0 6 2.9 4.5 5.9
1993 15.2 6.9 12 28 3.5 4.7 5.7 8 3.0 6.5 11.9
1994 4.0 4.9 6.6 6
1995 17.4 6.8 11 20 4.2 5.2 6.5 6
1996 2.5 3.8 4.7 6
1997 3.2 4.2 5.4 6
1998 15.1 6.8 13 31 3.5 4.6 6.1 10 1.5 5.8 10.7
1999 3.3 4.8 6.2 6
2000 3.6 5.1 6.2 6
2001 14.5 7.0 14 3.9 5.0 6.2 6 4.1 7.0 13.5
2002 16.1 7.0 12 3.8 4.9 6.3 8 4.0 5.5 9.2
2003 17.2 7.2 27 4.5 5.3 5.9 9 4.5 4.5 4.5
2004 3.9 5.0 6.0 6
2005 13.0 11 3.7 4.8 5.6 6 2.3 4.0 6.8
2006 19 17.1 74 7.4 13 3.0 4.5 6.0 7
2007 4.1 5.3 6.2 6
2008 17.3 6.8 10 140 4.2 5.0 6.2 7 3.2 6.2 8.3
2009 19.8 11 3.0 4.5 5.5 6
2010 19.0 11 130 3.5 4.7 6.0 6 7.4 7.4 7.4
2011 17.0 13 140 3.9 4.7 5.4 6 3.0 5.2 8.1
2012 4.1 4.8 5.6 7
2013 3.7 4.7 5.5 5
2014 18.0 12 110 3.8 5.0 5.8 9 4.8 5.9 7.9
2015 3.4 4.8 6.0 7
2016 21 78 2.9 4.8 6.4 10
2017 18.4 12 90 4.1 4.8 5.5 9 4.1 5.3 7.1
2018 4.1 5.1 6.3 13

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
19 16 61 7 12 115 27 2.3 4.7 6.6 6.5 1.3 5 14

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2015-09-01
2016-08-05
2016-08-18
2016-09-13
2017-08-14
2017-09-05
2018-08-13
2018-09-14
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 25.4 8.3 27 8.1 25 8.2 23 8.0 24.8 7.9 21.0 8.9 26.4 8.1 23.4 8.2
1 24.6 8.2 27 8.2 25 8.2 23 7.9 24.7 8.1 20.2 9.0 26.2 8.1 22.5 8.4
2 24.3 8.4 26 8.2 25 8.2 23 8.2 24.3 8.2 20.1 9.0 26.0 8.1 22.1 8.2
3 24.2 8.4 26 8.2 24 8.1 22 7.7 24.1 8.0 19.9 8.8 26.0 8.0 22.0 8.2
4 24.1 8.4 26 8.1 24 8.0 22 7.7 23.8 7.5 19.8 8.7 25.9 8.0 21.8 7.9
5 23.9 8.1 24 7.4 24 7.3 22 7.5 23.0 6.5 19.5 8.3 24.9 6.6 21.6 7.0
6 20.1 0.7 20 1.4 23 3.5 22 6.9 18.2 0.6 19.2 7.5 20.8 1.2 21.1 4.7
7 15.8 4.0 16 0.8 17 0.5 20 2.2 14.1 1.8 16.5 1.6 14.9 0.3 16.9 2.2
8 12.5 0.5 12 1.8 13 0.5 14 0.7 10.0 0.3 11.3 0.1 10.0 0.3 11.1 0.3
9 10.5 0.4 11 0.5 11 0.5 12 0.6 9.3 0.3 9.5 0.1 8.5 0.3 9.1 0.3
10 9.6 0.5 10 0.4 11 0.5 11 0.6 8.9 0.4 9.0 0.1 7.8 0.3 8.3 0.3
11 9.4 0.5 10 0.5 10 0.6 10 0.5 8.7 0.4 8.8 0.1 7.6 0.4 8.1 0.4

Most recent temperature and dissolved oxygen profile plots

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