Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
BROOKSVILLE HANCOCK 15 1 0.5 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
14 m
(47 ft) 		6 m
(21 ft) 		264 ha
(652 ac) 		16,779,900 m3
(13,604 ac-ft) 		11 km2
(4.3 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 9.0 10.0 6.7 6.7 6.7 1 2.4 2.4 2.4
1981 5.0 5.1 5.3 3
1982 6.0 47 7.0 5.0 5.8 7.0 6 2.1 2.1 2.1
1983 5.0 5.6 6.2 6
1984 6.0 6.3 6.8 5
1985 5.0 35 7.0 5.5 5.8 6.3 5
1988 5.0 6.4 7.4 5
1989 5.5 6.5 8.2 5
1990 8.8 82.5 4.0 6.6 8.0 5
1991 6.0 38 6.5 7.5 130.0 4.5 6.5 8.0 5 1.9 1.9 1.9
1992 5.8 8.0 52.0 6.0 6.9 8.6 5 2.0 2.0 2.0
1993 5.5 6.4 12 8.0 8.9 9.8 2 1.3 1.8 2.2
1994 5.5 6.2 5.5 133.5 8.2 10.3 12.5 2
1995 5.2 10.0 8.5 7.4 10.0 13.5 5
1996 7.0 7.1 5.0 10.0 9.6 9.6 9.6 1
1997 6.0 7.0 7.0 17.5 5.2 7.4 10.2 4 1.0 2.9 4.7
1998 6.0 7.0 7.0 8.8 6.3 8.6 11.6 5 1 1.1 2.4 3.7
1999 5.5 45 6.7 8.5 12.0 5.2 6.6 7.6 3 1.8 1.9 1.9
2000 6.0 6.7 8.5 8.0 7.0 8.9 10.7 4 1.9 2.8 3.6
2001 7.0 6.9 6.0 7.0 8.1 10.4 13.2 5 1.7 1.8 2.0
2002 4.5 6.6 6.5 44.0 7.1 9.1 11.4 6 1.6 2.0 2.4
2003 5.5 48 6.7 10.0 7.0 9.0 6.8 8.6 10.5 7 1.6 2.5 3.4
2004 5.5 6.7 5.0 20.0 7.5 8.8 11.4 4 2.8 2.8 2.8
2005 5.5 37 6.7 6.5 11.0 7.8 8.0 8.2 2 3.1 3.1 3.1
2006 7.0 7.0 7.0 18.0 4.8 6.3 7.4 5 2.7 3.0 3.2
2007 6.7 5.8 42 6.7 6.5 13.0 7.6 8.1 8.3 2 2.2 2.4 2.8
2008 7.0 6.9 7.0 18.0 6.3 6.9 8.0 6 2.6 3.0 3.5
2009 6.5 7.0 6.5 9.0 6.1 7.2 8.9 5 2.4 2.4 2.5
2010 5.5 7.0 6.0 7.0 23.0 7.1 7.9 8.8 6 2.2 2.9 3.6
2011 6.0 6.3 7.0 8.0 7.4 8.5 9.4 4 1.9 2.4 3.0
2012 6.0 5.2 5.8 11.0 7.7 8.0 8.2 2 2.0 2.4 2.8
2013 7.0 6.5 42 7.0 5.8 6.0 17.5 7.0 7.2 7.8 2 2.1 2.5 2.9
2014 7.0 43 5.5 55.0 7.5 7.8 8.1 2 3.9 4.3 4.7
2015 5.5 41 6.5 17.0 7.6 7.7 7.8 2 2.6 4.2 5.8
2016 6.2 51 7.0 6.2 14.0 7.3 8.0 8.4 4 1.5 2.1 2.6
2017 54 7.0 6.5 32.0 6.0 7.6 9.0 4 2.5 2.8 3.2

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
6.8 5.9 44 6.7 6.9 7 28 12 4 7.6 14 4 1 2.6 5.8

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2013-08-13
2013-08-22
2014-09-05
2015-08-20
2016-08-19
2016-09-21
2017-08-22
2017-09-26
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 23 8.3 25 8.6 24 8.5 26 8.3 25 8.4 22 8.9 24 8.6 22 8.9
1 23 8.3 25 8.7 24 8.5 26 8.3 25 8.4 22 8.8 24 8.6 22 8.9
2 23 8.3 24 8.7 24 8.5 26 8.3 25 8.4 21 8.8 24 8.6 22 8.9
3 23 8.3 24 8.5 24 8.5 26 8.3 25 8.4 21 8.8 24 8.6 21 8.8
4 23 8.3 23 8.8 23 8.6 25 8.5 24 8.5 21 8.7 23 8.5 21 9.0
5 23 8.3 23 8.7 23 8.4 24 8.5 24 8.4 21 8.7 23 8.5 20 8.9
6 22 8.0 23 8.5 23 8.3 24 8.2 24 8.3 21 8.7 23 8.3 20 8.6
7 22 7.7 22 7.7 23 8.0 23 7.4 24 8.1 21 8.7 23 8.1 20 8.4
8 19 3.8 21 5.6 22 7.7 21 4.9 24 7.7 21 8.5 22 5.9 20 8.2
9 17 1.7 17 0.6 22 6.4 19 2.1 22 4.0 21 8.6 20 1.8 20 7.7
10 16 0.6 16 0.0 21 5.2 18 1.1 19 1.0 21 8.6 16 0.1 20 7.6
11 16 0.5 16 0.0 20 1.8 18 0.8 19 0.5 21 8.5 16 0.1 20 7.5
12 16 0.2 16 0.0 17 0.1 18 0.6 18 0.2 21 8.4 16 0.1 20 7.4
13 15 0.1 16 0.1 18 0.3 18 0.0 21 8.4 16 0.1 19 5.6
14 15 0.1 15 0.1 17 0.0 21 8.2 16 0.1 16 0.2
15 15 0.1 14 0.1 16 0.0

Recent temperature and dissolved oxygen profile plots

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