Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
ELLSWORTH HANCOCK 23 1 0.41 flushes/yr 238 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
38 m
(124 ft) 		10 m
(32 ft) 		1,094 ha
(2,702 ac) 		108,000,000 m3
(87,557 ac-ft) 		61 km2
(23 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 4.3 6.4 7.4 9.5 6 1.1 2.6 5.6
1975 3.8 24 5.9 6.6 7.8 8.6 8 1.2 1.9 2.3
1976 6.8 5 6.0 7.4 9.5 8 0.9 2.2 4.0
1977 5 6.7 6.7 6.7 1
1980 6.5 9.0 11.5 4
1981 4.5 30 6.0 8 7.0 7.0 7.0 1 2.2 2.2 2.2
1984 6.5 7.8 9.2 4
1985 3.1 24 1.0 5 7.1 8.1 10.0 4
1986 7.0 7.7 8.4 5
1987 7.9 8.2 8.6 4
1988 4.0 26 5.0 7 9.5 9.5 9.5 1
1989 7.0 7.4 8.1 4
1990 6.1 7.2 8.5 5
1991 5.0 27 6.8 4.0 6.5 7.4 7.7 4
1994 5.0 3.0 1.4 1.4 1.4
1995 8.2 9.4 10.3 4
1996 6.7 7.2 8.2 5
1997 6.2 8.5 10.1 4
1998 6.4 9.3 10.4 6 8.2 8.2 8.2
1999 8.7 9.7 10.5 6
2000 5.0 33 4.0 6.9 8.9 10.9 5 2.0 2.0 2.0
2001 8.7 9.4 10.9 5
2002 8.2 9.5 10.0 4
2003 5 6.0 33 2.0 8.7 9.7 10.3 3 1.5 1.5 1.5
2006 6.5 7.5 8.3 4
2007 4.5 7.2 8.5 9.7 5
2008 9 4.0 30 6.6 4.0 8.5 9.2 9.8 6
2009 7.1 8.7 9.6 4
2010 3.0 2.0 10.6 11.1 12.0 4 1.5 1.5 1.5
2011 3.0 8.3 9.4 11.0 4
2012 7.8 10.1 11.3 6
2013 12 4.6 30 7.0 3.0 8.3 9.8 11.6 6 1.7 1.7 1.7
2014 9.5 10.4 11.2 3
2015 8.9 10.6 12.2 2
2016 9.1 10.1 11.3 5
2017 8.5 10.2 11.4 4
2018 4 6.0 39 7.0 3.0 12.6 12.6 12.6 1 1.0 1.0 1.0

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
7.5 4.6 30 6.8 3.7 4 6 6 8.8 13 4.3 0.9 2.4 8.2

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2013-08-20
2014-09-04
2015-08-07
2015-08-27
2016-08-23
2017-08-25
2017-09-14
2018-09-05
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 22.4 8.6 22.3 8.5 24.7 8.4 24.2 8.5 22.6 8.7 22.5 8.6 19.8 9.0 23.8 8.7
1 22.4 8.6 22.2 8.5 24.5 8.4 24.2 8.5 22.6 8.7 22.5 8.3 19.7 9.1 23.7 8.7
2 22.4 8.6 22.2 8.5 23.5 8.5 24.2 8.5 22.6 8.7 22.4 8.6 19.6 9.3 23.6 8.7
3 22.3 8.6 22.2 8.5 23.2 8.5 24.0 8.5 22.6 8.7 22.4 8.7 19.6 8.6 23.6 8.7
4 22.2 8.6 22.2 8.5 23.1 8.5 24.0 8.5 22.6 8.7 22.3 8.7 19.5 8.6 23.6 8.6
5 22.1 8.6 22.0 8.5 23.0 8.5 23.8 8.5 22.6 8.7 22.3 7.7 19.5 8.7 23.6 8.6
6 21.6 8.6 22.0 8.5 22.9 8.5 23.7 8.5 22.6 8.7 22.2 7.5 19.5 8.7 23.5 8.6
7 20.7 8.6 22.0 8.5 22.0 8.4 22.7 8.5 22.6 8.7 22.2 7.4 19.4 8.4 23.5 8.6
8 19.8 8.6 22.0 8.5 22.0 8.4 21.4 8.4 22.6 8.7 22.1 7.4 19.3 8.2 23.5 8.6
9 15.6 9.2 2.4 7.9 18.5 8.7 20.2 8.4 22.5 8.6 22.1 7.3 19.2 8.2 21.3 8.1
10 13.0 9.2 19.0 7.6 16.0 8.7 17.3 8.6 16.3 9.4 18.6 7.3 19.0 8.2 17.3 7.7
11 12.1 9.3 14.5 7.4 14.1 8.7 14.3 8.8 14.1 8.9 14.8 7.3 18.3 8.0 14.3 7.7
12 10.6 9.5 12.8 7.7 12.6 8.9 12.3 8.7 13.2 8.3 12.9 7.3 17.1 7.6 12.8 7.7
13 9.6 9.6 10.9 8.0 11.1 9.0 11.1 8.8 11.9 7.9 11.8 7.0 14.8 7.7 11.2 7.9
14 9.1 9.5 10.2 8.0 9.9 8.9 9.9 8.6 11.3 7.6 10.5 6.8 12.0 7.5 10.0 7.5
15 8.7 9.4 9.7 8.0 9.4 8.9 9.3 8.5 10.8 7.5 10.3 6.7 10.4 7.4 9.1 7.3
16 8.3 9.3 9.1 8.0 8.7 8.4 10.0 7.4 9.9 6.3 9.8 6.9
17 8.2 9.3 8.9 7.9 8.5 8.3 9.7 7.3 9.5 6.3 9.6 6.6 8.5 7.2
18 8.1 9.2 8.4 8.2 9.6 7.1 9.4 6.1
19 7.9 9.1 8.3 8.2 9.3 6.0 8.3 7.0
20 7.9 9.1 8.4 7.9 8.2 8.5 8.2 8.2 9.4 7.0 9.2 6.3 9.2 6.0
21 8.2 6.7
22
23 8.1 6.7
24
25 7.8 9.0 8.2 7.7 8.1 8.5 8.1 7.5 9.4 6.9 9.0 5.9 9.0 6.0 8.1 6.7
26 8.9 4.4
27 8.9 2.9
28
29
30 7.7 8.9 8.2 7.6 8.0 8.3 8.1 7.7 9.3 6.5 9.0 6.0 8.1 6.5
31
32
33
34
35 7.7 8.7 8.2 7.4 8.0 8.2 8.1 6.3 9.3 6.4 8.9 5.3 8.0 6.4
36
37
38
39
40 7.7 0.1 8.1 7.3 7.9 1.9 8.1 6.4 9.2 4.6 8.9 5.1

Most recent temperature and dissolved oxygen profile plots

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