Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
EASTBROOK HANCOCK 24 1 0.41 flushes/yr 167 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
8 m
(27 ft) 		5 m
(16 ft) 		176 ha
(435 ac) 		8,749,945 m3
(7,094 ac-ft) 		4 km2
(1.7 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
1980 3.7 3.9 4.6 3
1981 6.0 39 11 4.0 5.2 8.0 4 5.8 5.8 5.8
1982 6.7 6.7 6.7 1
1983 5.2 5.6 6.1 2
1984 5.0 9 7.5 7.5 7.5 1 2.0 2.0 2.0
1990 5.0 6.0 7.5 6
1991 8.0 31 7.0 13 3.0 5.4 7.0 9
1992 3.7 4.9 6.1 7
1993 4.5 5.1 5.5 5
1994 4.5 5.3 6.3 3
1995 2.8 4.1 5.1 5
1996 3.8 4.7 5.5 3
1999 2.0 4.1 6.2 4
2000 9.0 32 21 3.6 4.6 5.4 4 13.0 13.0 13.0
2002 1.8 4.7 7.2 4
2003 5 7.0 31 12 16 3.5 3.5 3.5 1 8.4 8.4 8.4
2004 10 6.5 32 6.8 13 12 16 2.3 4.3 6.0 3 12.0 12.0 12.0
2005 13 4.1 28 6.9 14 63 2.4 3.9 4.4 3 18.0 18.0 18.0
2006 15 5.0 28 7.0 16 14 46 3.0 4.2 5.4 2 13.0 13.0 13.0
2007 4.4 4.4 4.5 1
2008 10 2.9 4.3 6.0 5
2009 13 22 2.5 3.9 5.1 6
2010 1.7 3.8 5.5 7
2011 5.4 6.3 7.8 8
2012 16 5.5 30 6.9 19 12 47 1.5 3.0 5.5 13 12.0 17.0 22.0
2013 12 5.1 28 7.0 15 2.4 4.8 8.1 14 1.4 4.4 11.0
2014 9 5.0 28 7.1 11 2.3 4.8 6.5 9 8.4 8.4 8.4
2015 3.0 5.0 7.0 8
2016 8 3.7 5.3 6.8 9
2017 10 8.0 33 7.1 21 20 2.2 3.8 6.5 10 21.0 21.0 21.0
2018 12 7.0 31 6.8 19 53 1.8 3.9 6.6 9 7.0 7.0 7.0

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
11 6.2 31 6.9 15 13 38 1.5 4.7 8.1 5.5 1.4 11 22

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2017-08-31
2017-09-03
2018-08-08
2018-08-16
2018-08-27
2018-08-29
2018-09-07
2018-09-14
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 22 8.6 20 8.4 28 7.9 25 8.1 24 7.8 26 8.6 23 8.1 22 9.3
1 22 8.6 20 8.4 28 8.0 25 8.1 24 7.8 26 8.6 23 8.1 22 9.4
2 22 8.6 20 8.4 27 8.0 25 8.0 23 7.8 25 8.6 23 8.0 21 9.5
3 22 8.6 20 8.4 26 8.0 25 8.0 23 7.7 25 8.6 23 7.9 21 8.7
4 22 8.6 20 8.4 26 7.6 25 8.0 23 7.6 24 8.1 23 7.8 21 8.5
5 22 8.6 20 8.3 24 5.7 25 7.8 23 7.4 24 7.8 23 7.8 21 8.2
6 21 8.5 20 8.1 23 1.9 23 1.3 23 6.8 23 6.7 23 7.8 21 8.0
7 21 8.0 20 8.0 21 0.1 20 0.1 22 3.7 22 3.4 23 6.6 21 7.6
8 20 7.9 19 0.1 18 0.1 19 0.1 20 0.7 22 1.8 20 5.5

Most recent temperature and dissolved oxygen profile plots

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