Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
DEDHAM HANCOCK 23 1 0.72 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
10 m
(34 ft) 		6 m
(19 ft) 		289 ha
(714 ac) 		17,181,141 m3
(13,929 ac-ft) 		11 km2
(4 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
1983 6.0 5.0 8.0 9.1 10.5 5 3 1.0 1.0 1.0
1984 8.0 8.2 8.5 2
1986 10.0 10.0 10.0 1
1987 2.7 28 2.0 10.0 10.0 10.0 1
1989 9.8 9.8 9.8 1
1990 4.0 3.8 9.4 9.9 10.4 3 0.8 1.0 1.3
1996 4.5 25 4.0 5 10.0 10.0 10.0 1 1.1 1.1 1.1
1998 5.0 7.0 3.0 9.8 9.8 9.8 1 1 1.3 1.3 1.3
1999 4.5 6.7 4.0 9.4 9.6 9.8 2 2 1.3 1.4 1.5
2000 6.5 6.6 3.0 8.2 8.2 8.2 1 2.0 2.0 2.0
2001 6.0 6.8 5.0 8.2 8.3 8.4 2 2 1.0 1.0 1.1
2002 4.5 6.7 4.0 9.5 9.5 9.5 1 1 1.3 1.3 1.3
2003 3.5 22 6.8 8.0 9.3 9.3 9.3 1 1.9 1.9 1.9
2004 4.5 6.7 7.0 8.4 8.4 8.4 1 2.0 2.0 2.0
2005 4.5 14 6.7 4.0 9.2 9.3 9.4 2 2 1.2 1.4 1.7
2006 4.2 6.9 10.0 8.2 8.3 8.4 2 1.9 2.0 2.1
2007 4.8 6.6 6.0 9.1 9.2 9.3 2 2 1.2 1.6 1.9
2008 4.8 6.9 3.0 8.9 9.2 9.4 2 2 1.3 1.8 2.3
2009 4.5 7.0 3.0 6.8 8.1 9.4 2 1 1.1 1.8 2.4
2010 5.0 7.0 3.0 8.8 8.9 9.0 2 2 1.2 1.4 1.5
2011 4.5 3.0 8.1 8.3 8.5 2 1.2 1.4 1.7
2012 7 4.0 21 6.8 3.0 8.8 9.0 9.2 2 1 1.2 1.4 1.6
2013 5.5 2.0 9.3 9.3 9.3 2 2 1.3 1.4 1.4
2014 4.0 21 2.5 8.4 8.5 8.5 2 1 1.7 1.8 1.8
2015 5.0 19 4.0 9.0 9.1 9.2 2 1 2.3 3.4 4.4
2016 5.0 25 6.9 3.0 8.9 9.1 9.2 2 2 0.9 1.1 1.4
2017 4.0 35 7.0 3.0 8.3 8.9 9.5 2 2 1.0 1.4 1.7

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
7 4.6 23 6.8 4.1 5 6.8 9.1 10 1.8 0.8 1.6 4.4

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2010-08-28
2011-08-19
2012-08-14
2013-08-22
2014-09-05
2015-08-20
2016-08-19
2017-08-22
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 23 8.2 24 8.2 26 7.9 24 8.8 23 8.6 24 8.4 24 8.4 23 8.5
1 22 8.2 23 8.3 25 8.0 24 8.8 23 8.7 24 8.4 24 8.4 23 8.5
2 22 8.2 23 8.3 24 8.2 24 8.8 22 8.6 24 8.4 24 8.4 23 8.6
3 22 8.2 22 8.4 24 8.2 23 8.9 22 8.6 24 8.4 24 8.4 22 8.6
4 22 8.2 22 8.3 24 8.2 22 8.9 22 8.6 24 8.4 24 8.5 22 8.6
5 22 8.2 22 8.3 24 8.1 22 8.9 22 8.7 24 8.5 24 8.5 22 8.5
6 22 8.2 22 8.2 24 8.1 22 8.9 22 8.5 23 8.5 24 8.5 22 8.5
7 22 8.2 22 8.1 24 8.0 22 8.8 22 8.4 23 8.4 24 8.5 22 8.5
8 22 8.1 22 8.0 23 7.5 22 8.5 22 8.4 23 8.3 23 8.2 22 8.4
9 21 6.0 21 4.5 20 6.2 22 6.6 23 8.1

Recent temperature and dissolved oxygen profile plots

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