Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
ELLSWORTH HANCOCK 23 1 0.41 flushes/yr
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
1975 4.5 24 8.0 7.3 7.3 7.3 1 2.3 2.3 2.3
1984 5.6 6.6 8.0 4
1985 7.0 8.4 9.7 4
2000 9.0 33 5 11 10.2 10.2 10.2 1 1.8 1.8 1.8
2003 5.5 5.5 33 1 7.2 9.3 11.2 3 1.1 1.1 1.1
2006 6.0 6.8 7.6 4
2007 9.0 4.0 29 6.8 4.5 6.9 8.6 9.9 5
2008 2.3 7.5 8.2 8.8 5
2009 7.6 8.4 9.6 4
2010 2.0 8.0 9.6 10.6 5
2011 4.0 8.2 9.2 10.8 5
2012 8.6 9.6 10.5 5
2013 7.6 8.4 9.0 6
2014 7.9 9.0 10.7 4
2015 9.9 9.9 9.9 1
2016 7.6 9.3 11.1 5
2017 7.8 9.4 11.1 5

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
7.2 5.8 30 6.8 3 4.2 11 5.6 8.7 11 3.9 1.1 1.7 2.3

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2013-08-20
2013-09-17
2014-08-13
2014-09-04
2015-09-18
2016-08-23
2016-09-15
2017-08-25
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 24 8.3 19 8.3 24 8.6 22 8.2 24 8.6 23 8.6 21 9.0 22 8.7
1 23 8.4 19 8.3 23 8.6 22 8.4 23 8.6 23 8.7 21 9.0 22 8.6
2 23 8.4 19 8.3 23 8.6 22 8.3 22 8.7 23 8.7 21 9.0 22 8.7
3 23 8.4 19 8.3 23 8.6 22 8.3 22 8.6 23 8.7 21 9.0 22 8.5
4 22 8.4 19 8.2 23 8.6 22 8.3 22 8.7 23 8.7 21 9.0 22 8.2
5 22 8.4 18 8.1 23 8.5 22 8.3 22 8.6 23 8.8 21 9.0 22 8.4
6 22 8.4 18 8.1 22 8.5 22 8.2 22 8.6 24 8.8 21 9.0 22 8.1
7 21 8.0 18 8.1 22 8.5 22 8.1 22 8.6 24 8.8 21 9.0 22 8.3
8 20 7.7 18 8.1 21 8.0 22 7.7 22 8.6 24 8.8 21 9.0 22 7.8
9 18 7.0 18 8.1 18 7.5 20 6.8 21 8.0 22 8.8 21 9.0 21 7.8
10 15 5.4 18 8.2 16 6.5 18 4.9 19 5.4 21 8.0 21 9.0 18 6.7
11 13 3.9 18 8.0 15 4.9 16 3.0 16 3.5 16 5.0 20 7.7 16 5.4
12 12 3.7 14 4.0 15 2.5 15 2.0 16 4.1 15 4.5
13 12 3.9 14 3.5 14 2.1 14 1.0 14 3.2 15 4.1
14 13 1.0 14 2.0 14 0.9 14 2.5 14 3.3
15 14 1.7 14 0.8 14 2.9
16 13 1.2

Recent temperature and dissolved oxygen profile plots

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