Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
DEDHAM HANCOCK 24 1 0.52 flushes/yr 159 ft
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.

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
2017 6.5 8.2 9.1 6
2018 6.8 8.5 9.9 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
9.5 5.1 28 6.8 3.9 4.3 4.2 4.4 7.7 9.9 4.7 0.7 1.8 3.4

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2015-08-17
2016-09-01
2017-08-01
2017-08-15
2017-08-30
2018-08-08
2018-08-24
2018-09-05
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 26.4 8.5 23.4 8.6 23.4 8.5 23.3 7.3 21.2 8.4 26.9 8.1 23.9 8.3 23.9 7.9
1 25.2 8.5 23.4 8.6 23.0 8.6 23.2 6.4 21.2 8.4 26.8 8.2 23.7 8.3 23.8 7.9
2 24.6 8.6 23.3 8.6 22.9 8.7 23.2 6.7 21.2 8.4 26.6 8.2 23.4 8.3 23.6 7.9
3 23.8 8.7 23.1 8.6 22.9 8.6 23.1 6.3 21.2 8.3 26.5 8.2 23.3 8.3 23.6 7.9
4 23.5 8.6 23.9 8.6 22.8 8.5 23.1 6.6 21.2 8.1 25.3 8.3 23.2 8.2 23.5 7.9
5 23.2 8.5 22.7 8.6 22.8 8.5 23.0 6.3 21.1 7.9 24.5 8.1 23.2 8.2 23.5 7.9
6 22.7 8.3 22.5 8.5 22.5 8.3 22.9 6.4 21.1 7.6 23.6 7.9 23.1 8.2 22.8 7.5
7 22.1 8.0 22.5 8.5 19.6 7.3 22.8 6.1 21.0 7.4 21.7 7.4 21.7 6.9 22.8 7.5
8 19.7 7.1 22.4 8.4 17.2 7.0 22.5 6.1 20.9 6.8 18.4 6.9 19.6 6.2 20.1 6.0
9 18.0 6.6 21.2 6.6 16.1 6.8 20.9 5.6 19.3 5.5 16.6 6.8 16.9 5.7 18.0 5.3
10 16.9 6.7 18.8 6.1 14.7 6.8 19.2 5.4 16.7 4.8 15.4 6.8 15.7 5.8 16.0 5.4
11 15.0 6.9 17.8 5.8 13.3 7.1 17.7 5.2 13.9 5.0 12.9 7.7 14.4 6.1 13.8 6.0
12 12.8 7.9 17.2 5.8 10.2 8.7 11.8 6.0 11.4 6.0 11.0 8.8 11.6 7.6 11.2 7.6
13 10.3 8.7 13.6 7.0 8.4 9.0 11.5 6.0 9.8 6.7 9.4 9.5 9.1 9.2 9.4 8.6
14 8.3 9.4 10.6 8.2 7.6 9.2 9.0 6.8 8.4 7.1 7.9 10.2 7.9 9.6 8.0 9.2
15 7.5 9.7 9.6 8.7 7.3 9.1 8.4 6.7 7.6 7.2 7.3 10.2 7.1 10.0 7.2 9.7
16
17 6.6 10.0 9.2 9.1
18
19 6.0 10.1 8.2 9.4
20 5.8 9.0 8.0 6.5 5.7 7.7 5.5 11.3 5.6 10.8 5.6 10.3
21 5.6 10.4 7.5 9.6
22
23 5.4 10.4 6.9 9.9
24
25 5.2 10.4 6.7 10.1 5.2 9.0 6.6 6.8 5.2 7.4 4.9 11.3 5.0 10.6 5.0 10.7
26
27
28
29
30 5.0 10.3 6.1 10.2 5.0 8.8 5.9 7.0 5.0 7.1 4.8 11.2 4.8 10.8 4.8 10.6
31
32
33
34
35 4.8 10.2 5.7 10.0 4.9 8.6 5.7 6.8 4.9 6.8 4.6 11.3 4.7 10.6 4.7 10.6
36
37
38
39
40 4.8 10.0 5.6 10.1 4.8 8.4 5.5 6.7 4.9 6.5 4.6 11.0 4.6 10.5 4.6 10.7
41
42
43
44
45 4.7 9.5 5.6 9.9 4.8 7.9 5.1 7.2 4.8 6.3 4.5 10.6 4.6 10.0 4.6 10.2
46
47
48
49
50 4.7 9.1 5.5 9.5 4.8 7.0 5.0 7.0 4.8 6.0 4.5 9.5 4.5 8.8 4.5 8.9
51
52
53
54
55 5.4 8.9 4.5 8.3 4.5 8.3

Most recent temperature and dissolved oxygen profile plots

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