Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
ACTON YORK 2 1 1.26 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
30 m
(98 ft) 		7 m
(22 ft) 		260 ha
(642 ac) 		20,679,595 m3
(16,765 ac-ft) 		21 km2
(8.3 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
1974 3 4 7.3 7.4 7.5 2
1976 5.6 6.0 6.4 4
1977 11.0 57 4 6.0 5.8 7.1 8.7 5 3.3 3.3 3.3
1978 7.6 8.1 8.5 3
1979 7.3 7.9 8.5 4
1980 6.4 8.3 9.4 5
1981 11.0 34 8.0 8 6.7 7.8 9.3 5 1.3 1.3 1.3
1982 5.2 6.5 7.9 6
1983 6.2 7.6 9.6 5
1984 4.8 6.6 9.4 4
1985 7.0 39 4.0 4 6.4 7.5 8.8 3
1986 5.3 5.7 6.3 5
1987 4.4 6.0 7.6 7
1988 5.6 6.4 7.1 5
1989 5.1 5.4 6.1 5
1990 4.8 6.1 6.9 5
1991 23.0 47 7.1 6.0 5.0 5.0 5.0 1
1992 14.0 50 7.2 8.0 5 4.7 5.3 5.8 4 3.1 3.8 4.3
1997 9.9 51 7.3 4.0 11 6.0 6.4 6.9 1 3.8 3.8 3.8
1998 9.5 53 7.0 6.5 6 3.8 6.0 7.0 6 4.0 5.3 6.5
1999 9.0 61 7.0 7 10 5.4 6.8 8.1 7 9.1 9.1 9.1
2000 11.1 57 6.9 12 14.7 4.9 6.5 7.8 10 3.0 3.6 4.1
2001 6.8 7.8 5.8 6.9 8.0 9 1.8 2.7 3.5
2002 12 13.0 64 6.2 14 7.2 6.2 6.9 7.6 9 3.0 3.6 4.9
2003 8 11.0 65 5.0 11 5.9 7.1 8.6 5 3.6 3.6 3.6
2004 15 11.5 64 7.2 5.0 6.2 6.6 6.8 2 3.9 3.9 3.9
2005 10 9.1 61 7.2 5.0 5.1 5.6 6.2 2 3.2 3.2 3.2
2006 4.9 6.1 6.9 4
2007 5.2 6.2 7.0 4
2008 5.3 6.0 7.0 4
2009 5 6.3 6.7 7.0 4
2010 5 6.6 6.9 7.3 3
2011 6.2 6.5 6.6 4
2012 5.9 6.2 6.6 4
2013 6.1 6.6 7.0 4
2014 4 6.0 6.4 7.5 3
2015 10 10.0 68 7.2 6.0 7 5.8 7.5 10.1 4 4.4 4.5 4.8
2016 6.5 7.5 8.6 2
2017 7.0 7.5 8.2 3

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
11 11 55 7.2 6 4.8 8 8.9 3.8 6.7 10 4.4 1.3 4 9.1

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2014-09-23
2015-08-19
2015-08-24
2015-08-25
2015-09-25
2016-09-21
2017-08-24
2017-09-14
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 18.6 8.3 27.2 8.0 25.2 7.7 25.2 8.4 21.1 8.1 22.8 9.6 24.6 8.2 21.5 8.4
1 18.6 8.3 27.1 8.0 25.1 7.8 25.2 8.4 21.1 8.1 22.3 9.8 24.6 8.2 21.0 8.5
2 18.6 8.3 26.4 8.2 25.0 7.8 25.1 8.4 21.1 8.1 21.9 10.3 24.4 8.9 20.8 8.6
3 18.6 8.3 25.7 8.4 25.0 7.7 25.1 8.4 21.0 8.1 21.9 10.3 23.9 8.5 20.4 8.6
4 18.5 8.2 24.6 8.4 24.9 7.7 25.1 8.4 21.0 8.1 21.8 10.3 23.6 8.4 20.2 8.7
5 18.3 8.1 22.5 9.3 23.3 8.7 23.4 9.0 21.0 8.1 21.8 10.4 21.8 8.1 19.9 8.1
6 18.2 8.1 17.8 11.4 20.0 10.0 20.0 10.5 21.0 8.2 21.6 10.3 18.8 8.1 19.6 7.2
7 18.1 8.1 13.3 11.5 14.9 11.0 15.3 11.8 14.3 10.0 19.8 9.9 14.0 7.0 14.5 5.5
8 13.0 6.7 10.1 10.2 11.8 9.9 11.6 10.0 11.1 9.5 13.9 10.3 10.7 6.5 11.4 5.4
9 10.3 6.8 8.7 8.0 9.6 7.3 9.5 8.4 9.2 7.4 11.3 9.9 10.8 6.5 9.6 5.5
10 9.2 6.3 7.9 7.5 8.9 6.8 8.5 7.3 8.3 5.8 10.3 8.9 8.8 6.7 8.7 6.0
11 8.5 6.9 7.5 7.3 8.2 6.8 7.9 7.2 7.7 5.8 9.2 8.5 8.3 6.7 8.0 6.2
12 8.0 6.7 7.1 7.3 7.8 6.9 7.5 7.0 7.2 5.8 8.7 8.0 8.0 6.6 7.6 6.2
13 8.0 6.0 6.9 7.4 7.4 7.1 7.3 7.3 6.9 5.9 8.3 8.0 7.7 6.6 7.1 6.3
14 7.8 6.0 6.8 7.4 7.2 7.2 7.1 7.2 6.7 5.9 8.0 7.8 7.3 6.7 6.9 6.3
15 7.5 6.0 6.6 7.5 7.0 7.3 6.9 7.3 6.6 5.2 7.8 7.5 7.1 6.7 6.8 5.9
16 7.2 5.9 6.6 7.4 6.4 5.3 7.6 6.9 6.8 6.8 6.6 5.6
17 7.1 5.7 6.4 7.1 6.7 6.8 6.6 6.9 6.3 4.9 7.4 6.8 6.6 6.3 6.5 5.5
18 7.0 5.4 6.3 6.7 6.2 3.9 7.2 5.9 6.6 6.0 6.4 4.6
19 6.9 5.1 6.2 6.0 6.4 6.3 6.3 6.1 6.1 2.9 7.1 5.1 6.4 5.5 6.2 4.0
20 6.8 4.2 6.1 4.5 6.1 2.1 7.0 3.5 6.3 5.2 6.1 3.0
21 6.8 4.3 6.1 4.5 6.2 4.5 6.1 4.8 6.1 1.8 6.9 1.9 6.2 3.4 6.1 3.0
22 6.7 1.4 6.0 1.9 6.1 1.0 6.8 1.0 6.3 3.4 6.0 1.9
23 6.6 1.3 6.0 2.0 6.0 2.0 6.1 3.0 6.1 0.9 6.8 0.5 6.2 0.8 6.0 0.9
24 6.6 0.3 6.0 0.2 6.1 0.9 6.8 0.4 6.2 0.2 6.0 0.5
25 6.5 0.1 6.0 0.1 6.1 0.8 6.2 0.1 6.0 0.1
26 6.5 0.1

Recent temperature and dissolved oxygen profile plots

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