Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
WINTHROP KENNEBEC 12 1 5.55 flushes/yr 242 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
8 m
(25 ft)
3 m
(9 ft)
68 ha
(168 ac)
1,842,080 m3
(1,493 ac-ft)
19 km2
(7.5 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
1978 8 5.2 5.2 5.2 1
1979 11 3.3 4.1 4.6 4 1.7 3.1 4.9
1980 2.7 3.6 4.6 2
1981 13 18 3.4 4.0 5.1 4 2.0 3.1 4.0
1982 11 16 18 3.5 4.5 5.1 5 2.1 2.8 3.1
1983 10 3.4 4.0 4.3 4
1985 50 11 4.4 4.6 4.9 5
1986 17 3.2 4.0 4.6 5
1987 12 53 12 4.1 4.5 6.0 5
1988 16 10 4.2 4.8 5.5 6
1990 21 7.0 12 3.5 4.3 5.2 6 1.8 4.7 7.1
1991 19 7.1 4.1 4.5 4.9 4
1992 20 7.1 3.8 4.4 4.8 5
1993 19 7.0 12 4.2 5.0 6.5 5 2.9 3.3 3.9
1994 3.4 4.4 5.6 5
1995 3.0 4.4 5.1 5
1996 17 6.7 13 2.9 3.9 4.9 5 2.2 3.2 5.1
1997 3.6 4.5 5.0 5
1998 4.0 4.4 5.0 10
1999 16 6.8 12 3.8 4.6 5.4 10 3.7 4.1 4.6
2000 3.8 4.9 5.9 6
2001 3.6 5.0 5.7 6
2002 15 6.9 13 3.9 4.5 5.5 6 2.5 5.0 8.7
2003 4.2 5.1 5.9 6
2004 4.0 5.1 6.2 5
2005 14 6.8 11 3.7 4.6 5.5 5 2.0 7.4 22.8
2006 32 23 79 7.6 10 3.4 4.5 4.9 4
2007 3.2 4.1 5.4 4
2008 21 6.9 11 3.0 4.0 5.1 6 3.2 5.2 7.9
2009 23 3.9 4.4 5.8 6
2010 25 8 3.9 5.1 6.3 6 3.3 3.3 3.3
2011 21 12 3.7 4.5 5.5 4 3.6 4.8 7.0
2012 3.4 4.4 5.1 5
2013 3.6 4.5 5.0 5
2014 22 14 3.1 4.2 5.4 5 3.4 4.4 5.7
2015 3.8 5.0 5.7 5
2016 3.7 5.1 6.4 6
2017 21 12 4.3 5.0 5.7 6 1.8 3.8 6.1
2018 4.2 4.9 5.4 5

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
32 19 61 6.9 12 12 18 18 2.7 4.5 6.5 5.2 1.7 4.2 23

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2014-09-15
2015-08-10
2016-08-16
2016-09-12
2017-08-17
2017-09-14
2018-08-27
2018-09-13
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 19 8.3 25 7.8 25 8.4 23 7.8 24.1 8.1 24 24.9 8.1 24.6 7.9
1 19 7.8 24 7.8 25 8.4 23 7.7 24.0 8.1 21 24.7 8.1 22.0 8.1
2 18 8.0 24 7.9 25 8.2 23 7.7 24.0 8.1 21 24.5 8.1 21.5 8.1
3 18 7.8 24 7.9 25 7.9 22 7.7 23.8 8.0 20 23.7 7.8 21.2 7.8
4 18 3.7 21 1.4 24 6.7 22 7.4 22.7 5.6 19 23.4 7.9 20.8 7.5
5 15 0.6 16 0.6 19 0.4 20 1.7 14.9 1.1 18 17.6 1.7 19.4 3.3
6 13 0.2 13 0.7 14 0.5 16 0.6 11.4 0.4 14 12.2 0.5 12.9 0.5
7 11 0.2 12 0.5 12 0.4 13 0.5 10.2 0.5 11 9.7 0.4 10.5 0.3
8 11 0.2 11 0.5 12 0.4 12 0.4 9.4 0.1 10 8.9 0.4 9.4 0.3
9 11 0.5

Most recent temperature and dissolved oxygen profile plots

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