Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
ACTON YORK 2 1 0.84 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
13 m
(44 ft) 		6 m
(19 ft) 		119 ha
(294 ac) 		6,756,766 m3
(5,478 ac-ft) 		9 km2
(3.5 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
1977 13 4.5 5.8 7.0 6
1978 4.8 5.7 6.5 6
1979 13.0 37 6.0 5.5 5.9 6.5 5 2.5 2.5 2.5
1980 5.0 5.5 6.3 5
1981 5.7 6.6 7.5 5
1982 8.5 54 13.0 13 4.0 5.1 6.9 6 3.0 3.0 3.0
1983 4.7 5.7 6.5 5
1984 4.0 4.8 5.5 5
1985 6.0 6.8 8.1 3
1986 8.0 34 4.0 15 5.1 6.7 7.7 5
1987 5.0 5.6 5.8 2
1988 4.2 5.3 6.5 6
1989 4.0 5.1 6.5 5
1990 4.2 5.4 6.2 5
1991 7.5 42 7.0 7.0 4.8 5.5 6.8 6
1992 4.5 5.3 6.2 6
1993 8.0 5.5 13 5.6 6.2 7.7 6 1.5 2.4 3.4
1995 4.5 5.3 6.0 4
1997 5.2 6.1 6.8 4
1998 3.7 5.0 7.2 7
1999 9.0 52 11.0 25 4.5 6.0 7.6 7 4.2 4.2 4.2
2000 3.6 5.2 6.5 6
2001 4.7 5.4 6.5 6
2002 4.5 6.0 7.1 6
2003 4.7 6.4 8.4 4
2004 15 11.0 62 7.1 8.0 5.8 6.8 8.1 5 5.2 5.2 5.2
2005 5.5 6.5 7.1 5
2006 7 4.4 5.9 6.9 5
2007 6.2 7.3 8.1 4
2008 19 8.4 61 7.2 7.0 11 5.7 6.9 8.1 5 3.2 3.2 3.2
2009 9.0 13 5.8 6.4 6.8 3 2 3.2 3.2 3.2
2010 6.0 11 5.4 6.2 7.0 5 2.0 2.0 2.0
2011 5.6 6.6 7.4 4
2012 6.0 6.4 6.8 6
2013 5.5 6.6 7.7 5
2014 6.4 7.3 7.7 5
2015 9 12.0 78 7.2 4.0 10 6.5 6.8 7.4 3 4.8 4.8 4.8
2016 9 11.5 79 7.4 9.0 14 6.1 6.9 8.1 2 2.1 2.1 2.1
2017 10 11.5 91 7.2 9.0 6 5.6 6.6 7.5 5 2.1 2.1 2.1

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 9.9 59 7.2 7.6 6.5 14 3.6 6 8.4 4.9 1.5 3.2 5.2

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2014-09-26
2015-08-27
2015-08-28
2016-08-17
2017-08-10
2017-08-23
2017-09-07
2017-09-12
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 17 8.5 25.0 8.1 25.0 7.6 25 8.3 25.8 8.2 22.5 7.6 19.9 8.0 20.5 8.6
1 17 8.6 25.0 8.1 24.8 7.6 25 8.3 24.8 8.2 22.5 7.7 19.9 8.0 20.2 8.6
2 17 8.6 25.0 8.1 24.7 7.6 25 8.2 24.0 8.3 22.4 7.7 19.9 8.0 19.9 8.7
3 17 8.5 25.0 8.1 24.5 7.6 25 8.2 23.8 8.3 22.4 7.7 19.9 8.0 19.8 8.6
4 17 8.5 25.0 8.1 24.5 7.6 25 8.2 23.4 8.3 22.3 7.6 19.9 8.0 19.7 8.5
5 17 8.5 24.6 7.7 23.8 7.6 25 8.2 21.6 8.8 21.8 7.4 19.8 8.0 19.5 8.5
6 17 8.5 20.7 8.4 20.1 8.2 23 7.6 15.4 5.0 19.2 5.7 19.8 8.0 19.3 8.4
7 17 7.9 16.2 7.3 15.5 6.8 19 6.9 13.7 3.9 14.8 3.2 16.8 4.0 17.3 4.4
8 17 6.9 13.3 6.1 12.5 5.2 16 6.2 11.9 2.4 12.3 1.8 15.3 2.0 13.6 2.5
9 13 0.1 10.7 3.2 10.3 2.4 13 0.6 11.0 1.4 11.0 0.5 11.4 0.3 10.7 0.8
10 11 0.1 9.7 1.4 9.5 0.8 13 0.5 10.1 0.4 10.2 0.1 10.5 0.1 10.2 0.4
11 10 0.1 9.4 0.8 9.2 0.3 12 0.4 9.7 0.1 9.8 0.1 10.0 0.1 10.0 0.2
12 10 0.1 9.0 0.2 11 0.4 9.7 0.1 9.7 0.1 9.7 0.0
13 10 0.1 8.9 0.2 11 0.4 9.6 0.1
14 8.7 0.2 11 0.4 9.5 0.1

Recent temperature and dissolved oxygen profile plots

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