Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
WINTHROP KENNEBEC 12 1 1.58 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
32 m
(106 ft) 		9 m
(28 ft) 		84 ha
(207 ac) 		7,206,064 m3
(5,842 ac-ft) 		3 km2
(1.3 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
1971 7.0 7.0 7.0 1
1974 5.8 5.8 5.8 1
1976 7.6 5.8 6.7 7.8 7 1.5 3.1 4.6
1977 4.0 5.7 8.0 10.1 3 2.8 2.8 2.8
1978 14.0 3.3 5.2 6.7 4 2.3 4.2 6.0
1979 11.6 4.5 5.8 6.8 7 2.9 5.2 6.9
1980 10.4 6.0 6.9 8.3 4 2.0 2.7 3.4
1981 10.5 13.3 5.6 7.1 9.3 5 1.5 2.3 4.7
1982 8.0 8.3 5.0 7.0 9.5 8 1.2 2.1 2.7
1983 5.0 4.0 6.1 8.3 7 1.6 3.0 6.4
1984 4.2 5.2 8.5 5
1985 54 7.0 6.6 7.5 8.5 6 3.8 3.8 3.8
1986 10.5 4.9 6.6 7.7 6
1987 16 10.0 5.1 6.8 8.0 6
1988 14 8.0 5.4 7.1 8.4 7
1989 4.5 6.2 7.5 7
1990 17 7.0 4.6 6.0 7.6 6
1991 17 7.0 8.2 4.4 6.9 8.1 5 2.1 3.4 6.6
1992 16 7.1 4.3 6.0 7.5 5
1993 17 7.0 5.3 7.1 8.3 6
1994 16 7.0 7.4 4.9 7.1 9.3 7 1.1 3.2 5.9
1995 6.7 7.7 9.0 6
1996 4.9 6.3 7.6 6
1997 17 6.9 7.8 4.8 6.6 7.7 7 1.5 2.5 4.1
1998 4.8 6.0 7.2 6
1999 5.8 6.9 8.2 11
2000 16 6.9 8.8 8 5.2 6.1 7.1 6 2.1 5.0 12.0
2001 6.9 7.6 8.1 6
2002 6.0 7.4 8.2 6
2003 17 7.1 7.5 5.9 7.5 8.8 6 1.7 3.0 4.1
2004 15 7.0 7.0 5.3 7.1 9.0 7 1.4 2.8 4.5
2005 4.6 6.1 7.7 5
2006 14 19 92 7.0 7.8 4.9 5.9 6.8 6 2.6 3.8 5.1
2007 5.0 6.7 7.6 6
2008 5.2 7.9 9.9 6
2009 20 6.6 5.8 8.2 10.1 6 1.2 1.8 3.0
2010 22 6.0 7.8 8.8 10.2 7 1.4 1.4 1.4
2011 6.2 7.0 7.4 5
2012 19 12.4 5.5 6.7 7.1 5 2.6 5.0 6.8
2013 7.0 7.4 7.9 5
2014 5.6 7.8 9.3 4
2015 19 8.0 26 6.1 7.8 8.8 7 3.1 4.6 6.3
2016 6 11 99 7.8 5.0 5.4 7.7 8.9 9 2.2 2.2 2.2
2017 5.6 6.9 8.7 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
10 17 82 7 8 17 11 3.3 6.9 10 5.9 1.1 3.2 12

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2015-08-04
2015-09-02
2016-08-04
2016-08-18
2016-09-07
2016-09-20
2017-08-08
2017-09-21
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 26.0 8.1 26.2 8.2 26.4 7.9 25.1 7.8 23.7 8.8 22.6 8.6 23.9 8.1 21.3 9.8
1 25.5 7.9 25.5 8.2 26.4 8.0 25.0 8.0 23.7 8.8 22.0 8.7 23.9 8.1 21.3 9.8
2 25.4 8.2 24.5 8.4 26.0 8.0 24.8 7.9 23.6 8.8 21.9 8.8 23.9 8.1 21.2 9.8
3 25.0 8.3 24.5 8.3 25.8 8.0 24.7 8.0 23.6 8.7 21.8 8.7 23.9 8.1 21.2 9.8
4 23.5 8.7 24.3 8.3 25.4 8.1 24.6 8.0 23.5 8.7 21.7 8.6 23.9 8.1 21.0 9.8
5 19.6 12.0 22.1 10.7 21.2 11.1 24.1 8.5 23.3 8.5 21.6 8.7 19.0 12.0 20.8 9.9
6 13.0 14.2 16.1 14.1 16.7 12.6 18.3 12.1 21.9 10.1 21.1 8.5 12.9 13.0 17.5 11.2
7 10.8 14.6 12.1 14.2 12.7 12.2 13.8 12.6 16.3 12.2 16.8 11.7 9.3 9.7 13.2 11.5
8 8.6 13.0 9.4 11.9 10.8 10.6 11.0 10.3 12.6 10.6 12.4 9.0 7.7 8.5 9.8 9.8
9 7.7 11.3 8.1 9.9 9.2 9.5 9.4 9.5 10.3 8.5 10.2 8.2 6.5 7.0 7.3 7.1
10 6.8 10.0 7.4 9.3 8.4 9.3 8.2 8.9 8.7 7.8 8.5 8.1 5.9 6.9 6.7 6.8
11 6.2 9.5 6.6 8.9 7.1 8.8 7.4 8.7 7.7 7.2 7.3 7.9 5.4 7.2 6.0 6.6
12 6.0 9.2 6.0 8.2 6.4 8.5 6.7 8.2 7.0 6.9 6.8 7.4 5.2 6.6 5.4 6.7
13 5.7 8.7 5.8 7.7 6.2 8.1 6.4 7.9 6.6 6.5 6.4 6.4 5.0 6.2 5.2 6.4
14 5.6 8.4 5.6 7.1 6.0 8.0 6.1 7.5 6.3 6.3 6.2 6.1 4.8 6.5 5.0 5.8
15 5.5 8.2 5.5 6.9 5.9 7.7 6.0 7.2 6.2 6.1 6.0 5.8 4.8 6.5 4.9 5.6
16 5.4 8.2 5.8 7.6 5.9 7.3 5.9 5.8 4.7 6.2 4.8 5.2
17 5.3 8.3 5.4 7.3 5.8 7.9 5.8 7.5 6.0 5.6 5.8 6.0 4.7 5.9 4.7 5.1
18 5.3 8.0 5.7 8.3 5.7 7.1 5.7 6.0 4.6 6.0 4.7 5.1
19 5.2 7.9 5.2 7.1 5.7 8.2 5.7 7.1 5.8 5.8 5.7 5.9 4.6 5.7 4.7 5.1
20 5.2 7.9 5.6 7.6 5.6 7.0 5.7 5.9 4.5 5.7 4.6 5.1
21 5.1 7.7 5.2 6.7 5.6 7.3 5.6 6.8 5.8 5.7 5.6 5.9 4.5 5.5 4.6 5.0
22 5.1 7.5 5.6 7.1 5.6 6.8 5.6 5.7 4.5 5.3 4.6 4.9
23 5.1 7.4 5.1 6.4 5.5 6.8 5.6 6.7 5.7 5.3 5.6 5.0 4.5 5.1 4.6 4.0
24 5.1 7.2 5.5 6.8 5.5 6.4 5.6 4.7 4.5 4.8 4.6 3.3
25 5.1 6.9 5.1 5.3 5.5 6.2 5.5 5.7 5.6 4.3 5.5 4.0 4.5 4.5 4.5 3.0
26 5.1 6.4 5.5 6.1 5.5 5.4 5.5 3.9 4.5 4.0 4.5 2.5
27 5.1 5.7 5.1 3.4 5.5 6.0 5.5 5.1 5.5 3.1 4.5 3.3 4.5 2.1
28 5.1 5.2 5.5 5.0 5.5 4.8 5.6 2.4 5.5 1.9 4.5 2.6 4.5 0.7
29 5.0 4.4 5.1 3.1 5.5 3.9 5.5 4.2 5.6 1.4 5.5 1.3 4.5 2.2 4.5 0.1
30 5.0 2.8 5.1 0.6 5.5 3.0 5.5 2.4 5.4 0.7 4.5 0.2 4.6 0.1

Recent temperature and dissolved oxygen profile plots

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