Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
WINTHROP KENNEBEC 12 1 0.54 flushes/yr 330 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
NA m
(NA ft) 		NA m
(NA ft) 		34 ha
(84 ac) 		6,500,000 m3
(5,270 ac-ft) 		6 km2
(2.3 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 5.8 5.0 6.0 8.0 7 0.9 1.4 2.8
1978 10 5.5 5.5 5.5 1
1979 19.0 4.8 5.3 5.8 3 2.0 3.2 3.9
1980 16.0 4.3 5.2 6.0 2 3.1 3.1 3.1
1981 11.0 5.8 6.1 6.4 2 2.1 2.6 3.2
1982 9.0 7.7 4.2 6.3 7.6 6 1.7 3.2 4.7
1983 18.0 3.6 3.6 3.6 1 14.9 15.4 15.8
1984 42 32.6 8.2 8.2 8.2 1 1.1 1.1 1.1
1985 35 7.0 3.9 6.6 8.7 5 5.5 5.5 5.5
1986 7.0 6.9 7.7 8.7 5
1987 12 7.5 4.8 6.6 8.4 5
1988 10 10.0 5.0 6.9 8.7 6
1989 7.3 7.3 7.3 1
1990 13 6.9 5.6 7.2 8.1 5
1991 12 6.9 14.6 5.2 6.8 7.5 5 0.7 2.2 3.9
1992 13 6.9 5.4 6.6 7.4 5 1.7 3.1 5.5
1993 13 6.9 11.0 6.4 7.3 7.8 5 1.2 1.6 2.1
1994 12 6.9 8.2 21 5.2 6.8 7.6 5 2.6 3.2 4.5
1995 10.0 6.2 7.0 7.3 5
1996 4.3 5.3 6.0 5
1997 13 6.8 10.4 3.9 5.7 7.8 5 1.1 4.1 6.3
1998 16 57 8.5 14.3 17 1.0 3.9 7.0 7 3.2 14.5 38.1
1999 14 6.9 12.0 12.3 4.5 6.2 8.6 6 2.4 3.9 6.0
2000 14 7.0 11.6 17 2.8 6.0 8.3 6 1.0 4.2 15.0
2001 16 6.9 11.8 11 2.5 6.3 8.2 2 1.7 4.5 11.3
2004 12 6.9 7.0 3.3 5.0 6.0 6 4.8 5.3 6.0
2005 14 6.9 8.4 5.2 5.8 6.7 5 2.3 5.2 8.7
2006 4.4 5.0 5.5 5
2007 13 12 55 7.5 14.0 4.5 5.9 6.8 4 4.4 4.4 4.4
2008 5.1 6.2 7.1 6
2009 16 4.7 5.5 6.2 6
2010 16 9.2 59 5.3 6.4 7.5 4 1.9 2.9 3.6
2011 14 14.1 39 2.8 4.8 6.7 4 3.0 4.7 6.7
2012 15 8.5 5.2 6.1 7.1 5 2.5 3.7 4.9
2013 4.2 5.2 5.8 5
2014 4.8 5.8 6.2 5
2015 15 10.2 62 5.2 6.1 6.6 6 3.7 5.6 9.5
2016 6.1 7.3 7.7 6
2017 6.0 7.0 7.9 5
2018 23 14 78 7.2 11.5 54 5.6 6.6 7.6 6 2.0 12.3 48.0

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
18 14 54 7 11 10 35 18 1 6.1 8.7 4.6 0.7 4.8 48

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2013-09-09
2014-08-19
2015-08-06
2015-09-03
2016-08-18
2016-09-15
2017-08-17
2018-08-29
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 20.8 8.3 22.5 8.7 24.6 7.8 25.9 8.5 24.5 7.9 22.2 8.2 23.8 8.2 25.9 8.5
1 20.8 8.2 22.4 8.6 24.6 7.8 24.9 8.7 24.5 7.9 22.1 8.2 23.7 8.2 25.8 8.4
2 20.8 8.2 21.9 8.7 24.6 7.8 24.6 8.5 24.3 8.0 21.8 8.2 23.7 8.3 25.6 8.4
3 20.8 8.2 21.8 8.7 24.5 7.8 24.4 8.8 24.2 8.1 21.7 8.2 23.7 8.2 24.6 8.6
4 20.7 8.2 21.8 8.7 24.0 7.9 24.1 8.6 24.2 8.1 21.7 8.2 23.7 8.2 23.9 8.8
5 20.4 8.1 19.5 9.1 19.9 9.5 21.9 9.1 23.6 8.2 21.6 8.2 20.6 10.1 22.0 9.6
6 16.3 6.8 14.0 9.8 14.4 11.4 17.1 11.7 18.0 9.7 21.4 8.1 15.2 12.7 17.4 13.9
7 11.7 4.7 10.1 7.4 10.8 9.7 11.7 8.2 12.3 7.7 15.8 7.1 10.5 10.1 10.9 11.6
8 9.8 3.2 8.3 6.1 7.8 5.5 9.0 5.2 10.3 5.4 11.2 4.0 8.4 7.2 8.1 5.8
9 8.8 2.6 7.4 5.2 7.4 4.8 7.6 3.6 9.2 4.4 9.7 2.9 7.3 5.7 6.7 4.3
10 8.4 2.6 7.1 4.9 7.1 4.5 7.2 3.4 8.7 4.0 9.1 2.6 7.1 5.4 6.3 3.8
11 8.2 2.5 7.0 5.1 6.9 4.7 7.0 3.4 8.4 4.1 8.7 2.6 6.9 5.1 6.0 3.6
12 8.0 2.5 6.9 4.8 6.7 4.1 6.9 2.9 8.3 3.8 8.2 2.0 6.7 5.0 5.8 2.8
13 7.8 1.8 6.8 4.7 6.6 4.0 6.8 2.6 8.0 3.3 8.1 1.6 6.6 4.0 5.6 2.8
14 7.7 1.3 6.7 4.4 6.5 3.6 6.7 2.1 7.8 2.4 7.8 0.7 6.4 3.0 5.5 1.9
15 7.7 1.0 6.6 3.5 6.5 3.0 6.6 1.2 7.7 1.5 7.7 0.7 6.4 3.0 5.5 0.9
16 7.6 0.7 6.5 2.7 6.4 2.7 6.5 0.7 7.6 1.4 7.7 0.6 6.3 2.5 5.5 0.8
17 7.6 0.4 6.5 2.5 6.4 2.2 6.4 0.6 7.6 1.2 7.7 0.6 6.3 2.4 5.4 0.8
18 7.6 0.3 6.5 2.3 6.4 2.1 7.6 1.1 7.6 0.6 5.4 0.7
19 7.6 0.3 6.5 1.9 7.6 0.9

Most recent temperature and dissolved oxygen profile plots

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