Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
SURRY HANCOCK 23 1 1.02 flushes/yr 137 ft
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.

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
2017 5.5 5.6 5.7 5
2018 5.4 5.6 5.8 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
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

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2000-08-25
2007-08-06
2007-08-20
2007-09-03
2008-08-30
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 22.2 8.8 25.2 8.0 21.9 8.4 21.5 8.1 22.1 9.7 24.5 8.3 23.5 8.1 27.2 8.5
1 22.2 8.8 25.2 8.5 21.4 8.7 21.6 8.3 21.6 9.5 24.5 8.5 23.5 8.1 27.2 8.5
2 22.2 8.8 25.3 8.6 21.2 8.9 21.6 8.4 21.6 9.1 24.5 8.6 23.3 8.1 27.1 8.5
3 22.1 8.7 25.3 8.9 20.8 9.1 21.6 8.5 21.5 9.1 24.4 8.7 23.2 8.1 24.7 8.6
4 22.1 8.8 25.3 9.1 20.7 8.9 21.6 8.6 22.9 8.3 24.1 8.7 23.2 8.0 23.9 8.4
5 22.1 8.7 21.5 7.1 20.7 8.9 21.6 8.6 23.0 7.9 21.9 8.9 22.9 7.6 23.4 8.0
6 21.9 8.4 20.2 6.7 20.6 9.0 21.2 7.8 23.5 7.4 21.4 6.8 19.7 5.0 22.9 7.4
7 21.7 8.1 17.8 5.7 20.6 9.0 20.3 7.1 22.7 6.5 19.5 5.9 15.4 4.7 20.3 4.6
8 20.5 6.5 15.9 5.7 18.5 7.4 17.0 5.0 19.8 3.2 19.7 5.6 12.2 5.0 16.2 4.1
9 16.7 4.7 13.3 6.5 12.9 6.4 13.7 4.9 16.1 3.5 16.5 5.9 10.6 6.6 13.4 5.0
10 14.8 4.9 12.9 7.4 11.2 6.8 11.5 5.7 14.0 4.2 15.9 5.9 9.2 7.0 11.3 5.7
11 12.9 5.5 10.7 8.2 10.2 7.2 10.3 6.4 12.8 4.6 15.3 5.9 7.9 7.8 10.1 6.1
12 12.0 6.0 9.8 8.7 9.1 7.5 9.5 6.7 11.5 5.1 13.7 6.0 7.3 8.1 8.8 7.0
13 10.9 6.0 9.3 9.0 8.6 7.6 9.1 6.8 10.5 4.8 12.7 6.1 6.8 8.3 7.7 7.0
14 10.1 6.2 8.6 8.8 8.3 7.5 8.7 6.6 9.9 4.5 10.3 7.4 6.6 8.5 7.1 7.1
15 10.0 6.3 8.5 8.9 8.3 7.3 8.5 6.5 9.8 4.4 9.9 7.4 6.4 8.4 6.7 7.0
16 9.7 6.3 8.3 8.9 8.3 7.3 8.4 6.6 9.8 4.4 9.7 7.2
17 9.7 6.3 8.3 8.9 8.3 7.3 8.4 6.5 9.7 4.4 6.2 8.2 6.4 7.0
18 9.7 6.3
19 9.5 6.3 6.1 8.2 6.2 6.8
20 9.5 6.2
21 9.4 5.9 6.0 8.1 6.1 6.5
22 9.2 5.7
23 9.2 5.7 6.0 7.3 6.1 6.3
24 9.2 5.5
25 9.2 5.3 6.0 6.0
26 9.1 5.2
27 9.2 5.2 6.0 5.9
28 9.2 5.1 6.0 5.3

Most recent temperature and dissolved oxygen profile plots

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