Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
DEDHAM HANCOCK 23 1 0.52 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
32 m
(105 ft) 		10 m
(31 ft) 		335 ha
(827 ac) 		32,000,000 m3
(25,943 ac-ft) 		17 km2
(6.7 mi2)

Secchi Disk Transparency Graphs

Graph Legend: Secchi symbols = average Secchi Disk Transparency Values; tick marks = maximum and minimum values for each year.

## [1] "No 2017 Secchi Disk Transparency Data"

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 4.5 5.2 7.0 9.1 6 0.4 1.79 2.9
1975 7.5 28 5.3 6.1 8.1 9.8 8 0.7 1.26 1.6
1976 7.4 3.0 6.7 8.6 11.6 8 0.6 1.85 2.9
1977 4.0 6.9 8.6 9.5 5
1978 7.5 9.1 10.5 6
1979 6.0 7.1 8.5 7
1980 4.5 58 6.0 17.5 6.0 7.7 9.0 5 1.5 1.91 2.6
1981 7.0 8.0 9.0 5
1982 6.5 8.2 10.0 5
1983 6.0 4.0 4.5 8.5 12.0 5 0.9 0.90 0.9
1984 4.0 6.9 6.5 8.4 10.0 5 1 1.3 1.65 2.3
1985 6.0 45 3.4 4.0 6.5 8.8 11.0 7 0.3 0.93 1.8
1986 7.0 8.1 9.5 7
1987 7.0 8.4 10.0 7
1988 5.0 32 9.0 6.5 6.0 7.6 9.0 7
1989 5.0 7.8 9.5 5
1990 6.0 8.1 9.5 7
1991 5.0 35 7.2 3.0 6.5 8.3 10.0 7 1.0 1.00 1.0
1992 7.0 8.1 8.5 7
1993 7.0 8.8 10.3 6
1994 7.2 8.6 9.6 7
1995 7.3 10.1 11.6 7
1996 6.0 34 7.1 8.0 5.5 7.6 9.5 7
1997 8.0 37 7.1 2.0 6.4 8.7 10.6 8 2.2 2.20 2.2
1998 7.0 8.3 9.9 7
1999 6.0 8.6 10.5 7
2000 6.3 8.1 9.4 7
2001 7.6 10.8 11.8 6
2002 9 10.0 43 4.0 8.0 11.1 13.3 7 1.4 1.40 1.4
2003 8.7 11.1 12.6 6
2004 9.2 10.4 12.6 6
2005 5.6 8.7 9.9 7
2006 6.4 8.3 9.2 5
2007 6 6.5 39 7.1 1.0 5.8 9.0 10.4 7
2008 6.9 9.7 10.9 8
2009 8.1 9.4 10.6 7
2010 8.3 10.5 11.8 7
2011 7.0 9.1 11.2 6
2012 5 7.5 45 7.2 2.0 8.0 9.5 11.8 7 1.0 1.00 1.0
2013 7.5 9.1 10.7 7
2015 4.9 9.3 10.5 6

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
6.7 6.3 40 7.1 5.2 3.6 6.5 4.5 8.8 13 6.5 0.3 1.4 2.9

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1983-08-24
1984-09-10
1985-08-22
1988-08-31
1996-09-25
1997-08-25
2002-08-22
2012-09-18
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 21.5 8.4 20.1 9.8 22.7 8.6 22.0 8.9 16.8 9.0 20.8 8.5 24.4 8.4 19.8 8.3
1 21.0 8.4 20.1 9.8 16.9 9.0 20.5 8.5 24.5 9.2 19.8 8.1
2 21.5 8.4 20.1 9.9 22.7 8.6 22.0 8.9 16.9 9.1 20.5 8.6 25.5 9.3 19.8 8.3
3 21.5 8.4 20.1 9.8 16.9 9.1 20.5 8.6 24.5 9.3 19.8 8.3
4 21.0 8.3 20.1 9.9 22.5 8.6 21.9 8.9 16.9 9.1 20.3 8.5 24.4 9.4 19.7 8.3
5 21.5 8.4 20.1 9.8 16.9 9.1 20.2 8.5 24.4 9.4 19.7 8.2
6 21.5 8.4 20.1 9.8 22.5 8.6 21.8 8.9 16.9 9.1 20.2 8.5 24.4 9.4 19.7 8.1
7 21.5 8.4 20.0 9.8 21.8 8.9 16.9 9.1 20.1 8.5 24.1 9.6 19.7 8.1
8 16.0 9.0 19.5 9.6 21.5 8.6 20.1 9.1 16.9 9.1 17.8 10.6 19.8 11.0 19.6 8.1
9 14.0 8.1 15.9 9.3 18.0 9.7 16.0 10.0 16.9 9.0 13.2 10.6 17.5 10.3 16.8 9.6
10 12.5 7.4 12.8 8.9 15.2 9.9 13.2 10.0 14.6 8.0 11.5 9.8 15.0 9.6 12.9 8.6
11 11.2 7.9 13.2 9.8 11.2 6.7 10.1 8.9 13.5 9.6 11.4 6.7
12 10.8 6.7 10.4 6.5 11.5 9.5 10.8 9.1 10.2 5.9 9.6 8.0 12.4 8.6 10.5 5.8
13 9.3 6.2 9.0 7.8 11.5 8.4 9.2 5.8
14 9.5 6.5 9.2 7.3 10.0 9.1 9.5 9.0 9.0 6.3 8.5 7.3 11.0 8.2 9.2 5.6
15 8.6 5.6 8.0 6.9 10.6 7.7 8.8 5.4
16 9.0 6.1 8.9 7.4 9.0 8.3 9.0 8.3 8.4 5.8 8.0 6.8 10.4 7.4
17 8.3 5.7 8.0 7.0 10.3 7.0 8.3 5.0
18 8.8 6.9 8.7 8.0 8.8 7.8 8.1 5.7 8.0 6.5 10.1 6.5
19 8.1 5.4 8.0 6.5 10.0 6.5 8.0 5.0
20 8.2 5.8 8.5 6.5 8.5 7.7 8.5 7.3 8.0 5.2 7.8 6.2 9.9 6.0
21 7.9 4.8
22 8.0 5.2 8.2 6.3 8.0 6.6 7.9 4.5 7.6 5.8
23 7.8 4.3 9.4 4.7
24 8.2 6.2 7.8 4.1 7.5 5.5 7.3 4.2
25 8.2 6.7 7.8 4.1 9.0 4.2
26 8.1 6.1 7.7 4.0 7.5 5.4
27 7.7 3.9 7.5 5.0 7.4 3.5
28 8.1 3.1
29
30 8.2 6.2

Recent temperature and dissolved oxygen profile plots

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