Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
CASCO CUMBERLAND 5 1 0.53 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
20 m
(64 ft) 		6 m
(21 ft) 		201 ha
(496 ac) 		12,984,931 m3
(10,527 ac-ft) 		12 km2
(4.5 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
1976 5.5 6.5 7.3 4 2.3 2.9 3.4
1977 5.5 5.5 5.5 1
1978 8 5.0 6.0 7.0 5
1979 16 38 6 18 3.5 5.3 7.0 4 2.5 2.5 2.5
1982 11 48 16 14 5.7 5.7 5.7 1 5.2 5.2 5.2
1983 9 31
1984 5.5 5.8 6.1 4
1985 9 40 10 13 5.2 6.1 6.7 3
1989 4.0 5.9 8.0 7
1990 12 51 7.2 6 6.0 6.0 6.0 1 2.7 2.7 2.7
1991 10 43 7.1 8 6.4 6.4 6.4 1
1993 5.0 5.6 7.0 6
1994 4.4 5.6 7.0 5
1995 5.2 7.1 8.3 5
1996 4.6 6.2 7.5 9
1997 4.9 6.3 7.2 8
1998 12 59 8 8 3.5 5.9 7.2 7 3.0 3.0 3.0
1999 8 61 7 12 6.2 6.9 7.7 5 2.8 2.8 2.8
2000 4.6 5.3 6.0 8
2001 5.8 7.2 8.2 7
2002 5.8 6.9 8.2 6
2003 6.2 7.1 7.6 6
2004 8 15 74 7.4 9 26 5.7 6.7 8.0 6 2.7 2.7 2.7
2005 10 10 72 7.4 8 17 5.3 6.3 7.6 6 2.3 2.3 2.3
2006 5.3 6.5 7.8 9
2007 5.5 6.9 7.8 7
2008 5.2 6.3 8.1 11
2009 7 4.2 6.0 7.6 9 4.5 4.5 4.5
2010 5.4 6.5 8.1 10
2011 5.2 6.3 7.5 9
2012 5.3 6.2 7.5 8
2013 4.7 6.8 8.2 10
2014 5.6 6.5 7.9 10
2015 7 12 66 7.2 7 17 4.7 6.7 8.7 11 2.1 4.6 7.2
2016 6 5.3 6.8 7.8 6
2017 8 14 84 7.4 9 6 25 5.0 6.3 7.7 12 2.8 2.8 2.8

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
8.2 12 56 7.3 8.4 6.7 17 3.5 6.3 8.7 6.5 2.1 3.3 7.2

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2015-09-02
2015-09-09
2015-09-23
2017-08-11
2017-08-26
2017-09-11
2017-09-13
2017-09-26
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 26.3 8.2 26.4 8.1 22.7 8.1 25.0 8.6 23.5 8.1 19.9 8.5 22.4 9.0 23.0 8.5
1 25.8 8.2 26.4 8.1 22.5 8.2 24.9 8.6 23.6 8.1 20.0 8.5 21.7 9.0 22.8 8.5
2 25.3 8.2 26.4 8.1 22.0 8.2 24.7 8.6 23.6 8.1 19.9 8.5 21.1 9.0 21.7 8.7
3 25.1 8.2 26.4 8.0 21.9 8.2 24.5 8.6 23.6 8.0 19.9 8.5 20.6 9.0 21.3 8.8
4 25.0 8.2 25.1 8.1 21.9 8.2 24.4 8.6 23.6 7.9 19.9 8.5 20.3 9.0 20.9 8.8
5 24.9 8.2 24.9 8.0 21.8 8.1 24.2 8.5 23.6 7.9 19.9 8.5 20.1 8.9 20.6 8.7
6 23.4 8.1 24.2 7.8 21.8 8.2 17.7 10.1 19.8 8.2 19.9 8.5 19.9 8.7 20.4 8.5
7 18.4 4.4 19.4 4.5 21.7 8.0 14.0 6.5 15.1 5.5 18.2 5.7 18.5 5.9 18.0 3.8
8 15.4 1.5 15.9 1.0 16.0 0.1 12.0 4.4 12.4 2.9 13.9 1.6 14.2 1.2 14.4 0.2
9 13.1 0.8 14.0 0.1 13.5 0.1 10.7 3.4 11.0 2.1 11.5 0.6 12.1 0.8 12.3 0.2
10 11.1 1.8 11.7 0.5 11.4 0.2 9.6 3.9 10.0 2.3 10.1 1.4 10.7 1.3 10.4 0.8
11 10.4 2.0 11.1 0.7 10.3 0.3 9.2 4.2 9.0 2.8 9.1 2.2 9.7 1.9 9.5 1.4
12 9.7 1.6 9.5 1.0 9.7 0.2 8.6 4.2 8.5 2.6 8.4 2.0 8.9 1.9 8.6 1.2
13 9.3 1.5 9.3 0.9 9.2 0.1 8.1 3.9 8.1 2.4 8.1 1.8 8.5 1.8 8.3 1.2
14 8.9 0.7 9.3 0.1 8.9 0.1 7.8 3.4 7.7 1.3 7.9 1.0 8.1 1.4 8.0 0.7
15 8.8 0.4 8.7 0.1 7.6 2.6 7.6 0.6 7.8 0.7 7.9 0.7 7.9 0.2
16 7.5 1.8 7.6 0.0 7.7 0.4 7.7 0.0
17 8.6 0.3 7.5 1.4 7.6 0.0 7.8 0.2 7.7 0.0
18 8.5 0.3 7.8 0.1

Recent temperature and dissolved oxygen profile plots

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