Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
SEBAGO CUMBERLAND 4 1 0.27 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
20 m
(64 ft) 		11 m
(35 ft) 		284 ha
(701 ac) 		30,214,736 m3
(24,495 ac-ft) 		10 km2
(3.9 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 6.1 7.3 9.0 4 1.9 3.1 3.9
1977 5.0 5.9 5.9 5.9 1
1978 7.9 8.3 8.8 2 1
1979 4.0 30 4.0 7 7.8 8.6 9.4 4 1.7 1.7 1.7
1980 7.6 8.1 8.5 2
1987 4.7 4.7 4.7 1
1988 8.0 11.9 5.5 6.8 8.5 7
1989 11.0 5.5 6.3 7.5 4
1990 6.1 22 6.8 6.0 7.1 6.0 7.2 8.4 6
1991 7.0 6.0 14 6.5 7.8 9.3 6 1.4 1.4 1.4
1992 6.1 6.5 7.9 9.0 4
1993 11.0 7.0 8.1 5.5 7.4 10.0 6
1994 9.0 6.9 7.5 9.7 5.0 6.8 8.3 6
1995 8.3 7.0 6.0 8.0 5.7 7.6 8.4 6
1996 6.6 8.0 7.3 5.0 6.9 7.6 6
1997 5.0 26 6.9 4.0 7.2 5.0 7.0 8.8 6 1.5 4.2 6.7
1998 6.2 6.4 10.0 6.2 4.6 5.9 7.2 5 3.9 3.9 3.9
1999 6.0 6.5 6.0 6.8 5.9 8.4 9.9 10 1.6 3.0 4.7
2000 12.5 3.8 26 6.5 6.9 10.0 6.6 7.5 9.3 8 2.0 2.8 3.8
2001 10.4 6.7 30 6.8 5.1 9.3 6.8 7.6 8.7 8 4 1.2 1.6 2.3
2002 7.8 6.2 33 6.8 5.1 8.0 4.7 7.6 9.9 7 1.4 1.9 2.4
2003 6.4 5.8 23 6.7 5.1 7.8 5.8 7.8 9.4 5 1.6 2.5 4.0
2004 9.6 5.5 20 6.8 5.5 10.4 5.8 7.5 8.3 6 1.8 3.0 4.2
2005 14.0 6.3 21 6.6 6.8 8.3 5.4 7.2 8.3 5 1.6 2.1 2.5
2006 12.4 5.6 31 6.8 6.6 7.5 5.5 6.3 7.5 7 1.4 3.9 6.8
2007 9.9 5.3 18 6.7 5.6 9.2 5.0 6.5 8.5 6 2.1 3.1 4.4
2008 7.4 6.0 18 6.7 5.5 7.0 6.0 6.9 7.8 7 2.6 3.5 5.2
2009 10.7 7.3 18 6.7 6.4 5.7 6.0 6.8 7.3 7 2.2 2.9 3.8
2010 9.2 9.2 18 6.8 6.4 6.8 6.0 7.5 8.8 9 0.8 2.1 3.2
2011 12.3 6.9 17 6.8 7.1 8.8 5.6 7.3 9.0 7 1.1 2.7 3.5
2012 11.4 5.8 19 6.7 5.6 7.6 5.2 6.9 8.0 6 1.7 2.7 3.6
2013 10.4 5.1 21 6.7 5.0 7.0 6.6 7.4 8.4 6 1.5 2.2 2.5
2014 19.8 4.8 20 6.6 5.4 7.5 5.8 6.9 7.8 7 1.5 3.3 5.3
2015 23.1 6.0 22 6.7 4.7 7.8 7.2 8.7 10.4 6 1.2 2.4 4.6
2016 17.3 5.6 24 6.9 5.5 8.2 7.0 8.6 9.6 6 1.4 1.7 2.9
2017 15.7 6.4 22 6.8 5.2 8.6 6.0 7.2 8.7 6 1.9 3.0 6.6

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
12 6.4 23 6.7 6.3 10 7.8 4.6 7.2 10 5.7 0.8 2.7 6.8

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2015-09-03
2016-08-11
2016-08-26
2016-09-15
2017-08-09
2017-08-24
2017-09-13
2017-09-24
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 25.0 8.0 24.5 8.3 24.3 8.4 21.8 8.6 23.4 8.1 24.2 7.3 19.9 9.1 21.8 8.8
1 25.0 8.0 24.4 8.3 24.3 8.4 21.9 8.6 23.4 8.1 24.0 7.3 19.8 9.1 20.8 8.9
2 25.0 8.0 24.3 8.3 24.3 8.3 21.9 8.6 23.4 8.1 23.8 7.4 19.7 9.1 20.7 8.9
3 24.8 8.0 24.3 8.3 24.1 8.3 21.9 8.6 23.3 8.1 23.7 7.3 19.7 9.1 20.5 8.9
4 24.5 8.0 24.3 8.2 24.0 8.3 21.9 8.5 23.2 8.1 23.6 7.3 19.7 9.1 20.4 8.9
5 24.3 8.0 24.2 8.2 24.0 8.3 21.8 8.5 22.4 8.3 23.0 7.4 19.4 9.0 20.2 8.9
6 23.1 8.3 23.8 8.2 24.0 8.3 21.8 8.5 18.6 10.4 19.6 8.9 19.3 9.0 19.6 8.9
7 18.0 11.2 18.7 10.3 21.1 9.6 21.8 8.5 13.0 10.2 14.2 9.1 18.7 8.8 18.0 8.2
8 13.8 10.9 15.2 9.7 16.6 10.0 20.1 9.0 11.1 9.0 11.9 7.8 13.3 7.5 14.4 6.8
9 11.9 10.1 13.7 8.8 14.1 8.8 14.5 7.5 9.8 8.3 10.9 7.3 11.4 6.8 12.8 6.3
10 10.4 8.8 12.3 7.8 12.3 7.2 12.4 5.8 9.3 7.4 9.9 6.5 10.3 6.1 10.8 5.4
11 9.6 7.7 11.3 6.7 11.2 6.0 11.6 4.9 9.0 6.9 9.4 6.0 9.6 5.6 9.9 4.7
12 9.0 7.1 10.8 6.5 10.6 5.0 11.0 4.0 8.8 6.8 9.0 5.6 9.1 5.1 9.3 4.2
13 8.5 6.1 10.2 5.7 10.2 4.3 10.3 3.2 8.7 6.5 8.8 5.5 8.8 4.4 8.9 3.9
14 8.2 5.3 9.8 4.9 9.8 3.7 10.0 2.7 8.4 5.9 8.5 5.0 8.5 4.1 8.7 3.3
15 8.0 4.8 9.6 4.2 9.6 3.1 9.8 2.4 8.3 6.0 8.3 4.7 8.4 3.5 8.5 3.0
16 7.8 4.3 9.4 3.8 9.5 2.9 9.6 1.8 8.2 5.8 8.2 4.5 8.3 3.2 8.5 2.7
17 7.7 3.3 9.1 2.4 9.3 2.2 9.4 1.4 8.1 5.5 8.1 4.0 8.1 2.7 8.4 2.5
18 7.6 1.6 9.0 1.8 9.1 1.5 9.2 0.6 7.9 4.5 7.9 3.5 8.0 1.9 8.3 2.2
19 7.5 0.4 9.0 1.5 9.0 1.0 7.8 3.6 7.7 1.7 7.9 1.4 8.1 1.3
20 9.0 0.5

Recent temperature and dissolved oxygen profile plots

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