Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
SURRY HANCOCK 23 1 1.02 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
26 m
(87 ft) 		7 m
(22 ft) 		370 ha
(914 ac) 		24,345,429 m3
(19,737 ac-ft) 		20 km2
(7.7 mi2)

Secchi Disk Transparency Graphs

Graph Legend: Secchi symbols = average Secchi Disk Transparency Values; tick marks = maximum and minimum values for each year.

## [1] "No 2017 Secchi Disk Transparency Data"

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
1981 5.1 5.7 6.0 4
1982 5.0 38 3 6.0 6.8 6.8 6.8 1 2.0 2.0 2.0
1985 5.0 31 2 7.5 7.0 7.0 7.0 1
1988 4.7 5.6 6.5 5
1989 5.0 37 5 5.3 5.9 6.5 2 2.2 2.2 2.2
1990 4.5 5.1 5.5 6
1991 5.0 36 6.7 6 4.5 5.5 7.3 6 1.8 2.1 2.4
1992 5.0 5.4 5.7 6
1993 5.0 5.1 5.5 5
1994 4.5 5.3 6.0 5
1995 5.0 5.6 6.1 5
1996 5.2 5.7 6.0 5
1997 4.5 4.7 5.2 3
1998 4.8 6.3 7.9 6
1999 6.1 6.8 7.4 6
2000 9.0 39 6 5.0 5.9 7.5 6 3.3 3.3 3.3
2001 6.4 6.5 6.8 3
2002 5.4 5.7 5.9 6
2003 5.4 6.0 6.4 6
2004 5.2 5.7 6.0 6
2005 19 4.8 41 6.7 5 5.4 5.7 6.0 6
2006 5.5 5.7 5.8 6
2007 5.3 5.7 6.6 7
2008 5.4 5.6 6.2 7
2009 6 3.1 5.2 5.8 6
2010 5.4 5.6 5.8 6
2011 5 4.8 5.6 7.5 7 3.4 3.4 3.4
2012 5.0 5.4 5.7 5
2013 4.8 5.0 5.2 7
2014 5.0 5.3 5.4 6
2015 18 7.0 39 6.9 3 4.8 5.2 7.6 6 3.7 3.7 3.7
2016 4.8 5.1 5.2 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
18 5.8 37 6.8 4.3 5.5 6.8 3.1 5.7 7.9 5.3 1.8 2.8 3.7

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2007-08-20
2007-09-03
2007-09-16
2008-08-30
2008-09-17
2009-08-09
2011-08-08
2015-08-17
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 21.9 8.4 21.5 8.1 19.1 8.3 22.1 9.7 20.0 8.5 24.5 8.3 23.5 8.1 27.2 8.5
1 21.4 8.7 21.6 8.3 19.0 8.3 21.6 9.5 20.0 8.5 24.5 8.5 23.5 8.1 27.2 8.5
2 21.2 8.9 21.6 8.4 18.7 8.4 21.6 9.1 19.9 8.6 24.5 8.6 23.3 8.1 27.1 8.5
3 20.8 9.1 21.6 8.5 18.5 8.4 21.5 9.1 19.4 8.5 24.4 8.7 23.2 8.1 24.7 8.6
4 20.7 8.9 21.6 8.6 18.5 8.4 22.9 8.3 19.3 6.8 24.1 8.7 23.2 8.0 23.9 8.4
5 20.7 8.9 21.6 8.6 18.4 8.4 23.0 7.9 19.4 6.9 21.9 8.9 22.9 7.6 23.4 8.0
6 20.6 9.0 21.2 7.8 18.3 8.6 23.5 7.4 19.4 7.0 21.4 6.8 19.7 5.0 22.9 7.4
7 20.6 9.0 20.3 7.1 18.3 8.5 22.7 6.5 19.9 7.3 19.5 5.9 15.4 4.7 20.3 4.6
8 18.5 7.4 17.0 5.0 18.1 8.5 19.8 3.2 19.7 7.3 19.7 5.6 12.2 5.0 16.2 4.1
9 12.9 6.4 13.7 4.9 18.0 8.4 16.1 3.5 19.1 6.4 16.5 5.9 10.6 6.6 13.4 5.0
10 11.2 6.8 11.5 5.7 13.4 4.6 14.0 4.2 14.8 3.2 15.9 5.9 9.2 7.0 11.3 5.7
11 10.2 7.2 10.3 6.4 10.1 5.3 12.8 4.6 11.3 4.0 15.3 5.9 7.9 7.8 10.1 6.1
12 9.1 7.5 9.5 6.7 9.5 5.7 11.5 5.1 10.3 4.5 13.7 6.0 7.3 8.1 8.8 7.0
13 8.6 7.6 9.1 6.8 9.0 5.7 10.5 4.8 9.9 4.6 12.7 6.1 6.8 8.3 7.7 7.0
14 8.3 7.5 8.7 6.6 8.7 5.7 9.9 4.5 9.4 4.1 10.3 7.4 6.6 8.5 7.1 7.1
15 8.3 7.3 8.5 6.5 8.5 5.5 9.8 4.4 9.0 4.2 9.9 7.4 6.4 8.4 6.7 7.0
16 8.3 7.3 8.4 6.6 8.4 5.3 9.8 4.4 8.7 4.0 9.7 7.2
17 8.3 7.3 8.4 6.5 8.4 5.2 9.7 4.4 8.7 4.0 6.2 8.2 6.4 7.0
18 8.6 4.2
19 8.6 4.1 6.1 8.2 6.2 6.8
20 8.6 4.0
21 6.0 8.1 6.1 6.5
22
23 6.0 7.3 6.1 6.3
24
25 6.0 6.0
26
27 6.0 5.9
28 6.0 5.3

Recent temperature and dissolved oxygen profile plots

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