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
1976 5.3 6.0 6.7 4
1977 5.9 7.1 8.2 4
1978 7.0 7.8 8.7 3
1979 7.3 7.8 8.7 4
1980 6.9 8.3 9.4 5
1981 5.5 7.4 8.7 5
1992 14 50 7.3 7.8 5.1 5.4 6.0 3 4.2 4.5 4.8
2006 4.9 5.9 7.4 5
2007 5.5 6.6 7.5 3
2008 5.5 6.0 6.3 3
2009 5.9 6.3 6.9 4
2010 6.4 6.8 7.5 3
2011 5.5 6.4 7.7 3
2012 5.5 5.7 6.1 4
2013 6.1 6.6 7.0 2
2014 6.5 7.0 7.4 2
2015 8.0 8.6 9.3 2
2016 6.6 7.6 8.3 3
2017 6.1 6.4 6.8 2

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
14 50 7.3 7.8 4.9 6.8 9.4 3.4 4.2 4.5 4.8

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2014-08-25
2014-09-23
2015-08-19
2015-09-25
2016-08-25
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 25.0 11.7 18.7 8.5 27.4 8.1 21.0 8.1 25.3 8.1 22.9 9.9 24.6 8.6 23 8.9
1 23.9 11.7 18.6 8.3 27.3 8.1 21.0 8.1 25.2 8.2 22.3 10.2 24.7 8.6 21 8.6
2 22.8 11.8 18.6 8.3 27.2 8.2 20.9 8.1 25.1 8.2 21.7 10.2 24.2 8.7 21 8.6
3 22.4 11.7 18.2 8.3 26.1 8.2 20.9 8.1 25.0 8.3 21.7 10.2 24.7 8.7 20 8.7
4 21.8 11.6 18.0 8.1 24.7 8.5 20.9 8.1 24.7 8.2 21.4 10.2 23.2 8.7 20 8.6
5 21.1 11.3 17.9 8.0 22.8 8.8 20.9 8.1 24.6 8.3 21.3 9.5 21.7 8.4 19 8.1
6 20.1 10.6 17.9 8.0 19.3 10.1 20.3 7.8 24.5 8.3 21.2 9.4 16.5 6.3 19 7.5
7 14.8 10.6 17.1 7.4 14.3 8.6 14.5 8.2 24.4 8.1 19.9 9.4 14.2 5.4 16 5.1
8 12.1 9.7 12.7 6.5 10.6 7.3 11.0 5.5 20.9 8.1 16.4 9.0 11.9 5.1 15 4.0
9 10.9 9.1 10.2 4.3 8.7 6.0 9.2 4.3 14.1 8.6 12.6 7.5 10.1 5.1 15 3.9
10 10.5 7.8 9.3 3.5 8.1 5.1 8.1 4.3 12.1 7.9 10.3 4.9 8.9 5.0 16 3.8
11 10.3 7.5 8.7 1.8 7.7 3.0 7.5 4.9 11.8 7.0 9.6 0.9 8.4 4.1 16 3.9
12 9.3 6.8 8.7 1.3 7.6 1.0 7.2 4.4 9.5 5.5 9.6 0.3 8.2 0.7 16 3.0
13 9.3 6.5 8.7 1.1 7.0 4.2 8.9 1.9 8.3 0.2 15 3.0
14 9.2 6.4 8.6 0.8 6.8 3.9 8.7 1.4 8.3 0.1 14 1.5
15 9.2 6.2 8.6 0.7 6.6 2.7 8.7 0.5 14 0.9
16 9.2 6.0 8.8 0.6 6.5 0.6 8.8 0.3 14 0.8
17 9.2 6.0 8.8 0.1 6.5 0.2 8.7 0.3
18 9.2 5.8 8.0 0.1 6.5 0.2
19 9.1 5.4 8.0 0.1 6.6 0.1
20 9.1 3.0 6.5 0.0

Recent temperature and dissolved oxygen profile plots

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