Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
DEDHAM HANCOCK 24 1 0.52 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
52 m
(170 ft) 		11 m
(35 ft) 		1,209 ha
(2,989 ac) 		131,000,000 m3
(106,203 ac-ft) 		55 km2
(21 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 3.5 6.0 6.7 8.6 6 0.9 1.4 1.7
1975 7.4 6.0 6.9 8.0 7 0.7 1.5 2.3
1976 6.7 30 6.4 5 5.9 7.3 8.7 9 1.3 1.6 2.4
1977 4 8.0 8.0 8.0 1
1981 3.5 37 4.0 6 6.0 6.4 6.9 2 1.7 1.7 1.7
1983 6.0 2.0 3 9.5 9.5 9.5 1 1.3 1.4 1.5
1986 3.4 21 2.0 3 6.7 6.8 6.8 1
1990 4.8 6.3 8.0 5
1991 7.0 28 6.9 4.0 4.4 5.8 7.5 4
1995 5.8 6.2 6.7 4
1996 5.0 20 4.5 6.7 8.0 9.2 4 1.3 1.6 2.0
1997 7.1 8.2 9.3 6
1998 7.0 8.2 9.4 5
1999 6.5 8.4 9.5 6
2000 6.6 8.2 9.3 8
2001 3.2 32 6.7 6.0 6.7 8.1 9.7 8 1.6 1.6 1.6
2002 6.6 8.6 9.9 5
2003 6.8 7.9 9.2 6
2004 5.0 6.4 8.0 8.9 6 1
2005 6.0 6.6 7.6 6
2006 5.6 6.8 8.1 5
2007 3.0 6.1 7.4 9.5 5
2008 4.0 6.1 7.1 8.3 5
2009 5.0 6.3 7.7 5
2010 4.0 7.3 8.7 9.4 6
2011 6.6 7.8 8.5 4
2012 3.5 6.5 7.5 8.7 3
2013 6.4 7.2 7.9 4
2014 8.8 9.1 9.3 3
2015 7 5.0 28 6.9 2.0 9.5 9.6 9.7 1 3.4 3.4 3.4
2016 12 6.0 31 6.8 8.6 8.6 8.6 1 1.6 1.6 1.6

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
9.5 5.1 28 6.8 3.9 4.3 4.2 4.4 7.6 9.9 4.6 0.7 1.8 3.4

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2012-08-29
2012-09-20
2013-08-13
2013-08-30
2014-09-06
2014-09-23
2015-08-17
2016-09-01
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 23.1 7.5 18.8 8.4 22.1 8.1 22.8 7.9 22.8 8.4 17.5 8.6 26.4 8.5 23.4 8.6
1 23.1 7.6 18.8 8.7 22.0 7.9 22.8 7.7 22.2 8.5 17.5 8.6 25.2 8.5 23.4 8.6
2 23.2 7.6 18.8 8.6 22.1 7.6 22.7 7.8 22.1 8.5 17.5 8.6 24.6 8.6 23.3 8.6
3 23.2 7.6 18.8 8.7 22.0 8.1 22.5 7.6 22.1 8.5 17.5 8.6 23.8 8.7 23.1 8.6
4 23.2 7.6 18.7 8.6 21.6 8.2 22.4 7.3 22.1 8.5 17.5 8.6 23.5 8.6 23.9 8.6
5 23.2 7.6 18.7 8.6 21.5 8.0 22.4 7.1 22.0 8.5 17.5 8.6 23.2 8.5 22.7 8.6
6 22.4 6.8 18.7 8.6 21.5 7.8 21.3 6.5 21.9 8.4 17.5 8.5 22.7 8.3 22.5 8.5
7 18.2 5.2 18.7 8.6 20.0 7.4 19.3 6.1 21.7 8.3 17.5 8.5 22.1 8.0 22.5 8.5
8 16.7 4.9 18.7 8.5 16.6 6.7 17.7 5.5 20.0 7.1 17.5 8.5 19.7 7.1 22.4 8.4
9 15.3 5.2 18.7 8.5 15.0 6.5 15.6 5.2 18.8 6.3 17.5 8.4 18.0 6.6 21.2 6.6
10 14.6 5.0 17.4 6.3 13.4 6.6 14.7 5.3 17.1 6.1 17.3 8.3 16.9 6.7 18.8 6.1
11 13.9 5.6 14.5 5.1 12.3 7.1 12.8 5.4 15.0 5.6 17.0 7.9 15.0 6.9 17.8 5.8
12 11.8 6.6 11.7 6.6 10.2 8.4 11.1 6.1 11.9 7.4 12.4 7.2 12.8 7.9 17.2 5.8
13 10.3 7.7 10.1 7.7 9.0 9.1 8.8 7.5 9.2 8.9 9.3 8.3 10.3 8.7 13.6 7.0
14 9.1 8.3 9.1 8.2 7.7 9.5 7.6 7.9 7.9 9.3 8.0 8.7 8.3 9.4 10.6 8.2
15 8.6 8.4 8.4 8.8 7.0 9.9 7.2 8.0 7.3 9.4 7.3 9.1 7.5 9.7 9.6 8.7
16 7.7 9.0 6.9 8.0
17 7.2 9.3 6.6 10.0 9.2 9.1
18 6.9 9.6
19 6.6 10.0 6.0 10.1 8.2 9.4
20 6.7 9.5 6.4 9.5 5.7 10.5 5.7 7.7 5.5 10.1 5.6 10.0
21 5.6 10.4 7.5 9.6
22
23 5.4 10.4 6.9 9.9
24
25 5.7 9.8 5.6 10.1 5.4 10.7 5.3 6.3 5.2 10.5 5.2 9.8 5.2 10.4 6.7 10.1
26
27
28
29
30 5.3 10.0 5.2 5.2 5.1 10.3 5.1 8.7 5.1 10.3 5.1 9.5 5.0 10.3 6.1 10.2
31
32
33
34
35 5.1 9.7 5.1 9.9 5.0 10.2 5.0 7.9 5.0 9.1 4.8 10.2 5.7 10.0
36
37
38
39
40 5.1 9.6 5.1 9.7 5.0 10.0 5.0 6.8 4.9 10.0 4.8 10.0 5.6 10.1
41
42
43
44
45 5.0 9.0 5.0 8.8 4.9 9.3 4.9 5.8 4.9 9.5 4.7 9.5 5.6 9.9
46
47
48
49
50 5.0 8.0 5.0 7.4 4.9 8.9 4.9 4.0 4.9 8.8 4.7 9.1 5.5 9.5
51
52
53
54
55 4.9 0.0 5.4 8.9

Recent temperature and dissolved oxygen profile plots

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