Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
SURRY HANCOCK 23 1 0.6 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
37 m
(122 ft) 		6 m
(21 ft) 		949 ha
(2,344 ac) 		61,660,000 m3
(49,989 ac-ft) 		45 km2
(17 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
1977 6 5.0 6.4 7.0 5
1978 4.0 28 5 8.2 6.1 6.8 7.8 4 3.2 3.2 3.2
1980 2.5 4.3 6.9 5
1981 4.0 30 6 6 5.0 6.3 7.4 5 2.6 2.6 2.6
1984 5.5 6.3 7.0 4
1985 2.7 24 3 4 6.0 6.7 8.0 5
1986 6.7 7.3 8.0 4
1988 5.0 28 6 7 4.6 6.4 9.5 3
1989 3.2 5.0 6.5 5
1990 4.7 5.7 6.6 6
1991 4.5 5.9 6.6 6
1992 4.0 5.2 6.8 5
1999 5.4 34 6.7 6 5.4 6.5 8.2 6 3.2 3.5 3.8
2000 4.6 5.8 6.7 5
2001 5.8 6.7 8.3 4
2002 5.6 6.6 7.8 4
2003 4.2 6.3 8.2 6
2004 18 6.5 39 6.7 5 5.2 6.4 7.2 7 4.1 4.1 4.1
2005 4.5 5.8 6.8 5
2006 4.3 5.1 6.3 8
2007 4.6 5.1 5.8 7
2008 28 3.5 28 6.6 5 4.7 5.6 6.2 8
2009 4.2 5.0 5.8 7
2010 4.5 4.9 5.2 4
2012 3.8 4.6 5.4 5
2013 24 4.6 30 6.8 5 5 4.1 5.1 6.0 4 3.9 3.9 3.9
2014 4 5.2 5.3 5.5 2
2015 6 3.5 4.7 6.3 4
2016 21 6.0 33 6.9 5 5 6.5 6.5 6.5 1 3.5 3.5 3.5
2017 5 4.6 5.4 5.9 4

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
23 4.6 30 6.8 5.1 5 5.8 8.2 2.5 5.8 9.5 4.9 2.6 3.5 4.1

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2013-09-25
2015-08-19
2015-09-02
2015-09-08
2016-08-16
2017-08-15
2017-08-25
2017-09-17
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 16.8 9.1 25.8 7.6 24.0 7.2 24.6 7.7 24.8 8.7 24.0 7.3 22.7 7.5 21.0 8.1
1 17.0 8.7 25.8 7.2 24.0 7.4 24.6 7.7 24.8 8.6 24.0 7.3 22.8 7.4 21.0 8.0
2 17.1 8.6 25.7 7.3 24.0 6.9 24.4 7.7 24.8 8.6 23.8 7.2 22.8 7.4 21.0 7.7
3 17.1 8.5 24.2 7.9 23.9 6.9 24.0 7.6 24.8 8.6 23.8 7.1 22.8 7.3 20.5 7.9
4 17.1 8.4 23.7 7.6 23.9 7.3 23.7 7.6 24.8 8.6 23.2 7.1 22.8 7.6 20.1 7.8
5 17.1 8.5 23.0 7.4 23.8 7.2 23.4 7.3 24.3 8.3 22.7 6.8 22.8 7.3 19.6 7.2
6 17.1 8.5 21.2 6.2 20.9 4.9 22.9 6.9 20.8 6.3 22.1 6.5 21.6 6.8 19.3 7.2
7 17.1 8.5 16.8 5.4 18.7 4.3 18.6 4.4 17.7 6.0 18.5 4.9 20.0 5.6 19.1 7.1
8 17.1 8.5 14.3 5.8 14.9 5.0 13.3 5.6 12.7 6.8 14.0 5.6 17.4 4.8 18.4 6.7
9 17.1 8.6 11.9 6.7 11.5 5.9 11.7 6.1 12.2 7.3 11.0 6.3 11.8 5.6 14.8 4.9
10 11.5 6.3 10.3 7.2 9.5 6.9 9.6 7.0 10.4 7.8 10.3 6.7 9.4 6.5 11.0 5.4
11 8.5 6.9 9.3 7.6 8.6 7.0 8.8 7.4 9.9 8.1 9.1 7.2 9.0 6.8 9.4 5.8
12 8.1 7.1 8.2 8.0 8.0 7.4 8.1 7.6 9.3 8.2 8.4 7.3 8.5 7.2 8.7 6.1
13 7.9 7.2 7.6 8.0 7.6 7.4 7.8 8.1 9.0 8.3 8.0 7.5 8.0 7.7 8.2 6.1
14 7.8 7.2 7.2 8.2 7.3 7.8 7.6 7.5 8.6 8.3 7.7 7.3 7.9 7.4 7.7 6.5
15 7.6 7.1 7.0 8.2 7.1 7.7 7.3 7.4 8.5 8.3 7.5 7.6 7.6 7.4 7.6 6.6
16 7.5 7.2 6.9 8.0 7.0 7.6 7.2 7.4 7.4 7.5 7.5 7.4 7.5 6.6
17 7.5 7.2 6.8 8.1 7.0 7.5 7.0 7.6 8.3 8.2 7.3 7.4 7.4 7.3 7.4 6.6
18 7.4 7.2 6.7 8.1 6.9 7.6 6.9 7.5 7.2 7.6 7.3 7.4 7.3 6.4
19 7.3 7.3 6.6 7.9 6.9 7.6 6.8 7.6 7.9 8.3 7.2 7.6 7.3 7.3 7.2 6.5
20 7.3 7.4 6.5 8.3 6.9 7.6 6.8 7.7 7.2 7.5 7.2 7.2 7.2 6.4
21 6.5 8.3 6.7 7.6 7.7 8.3 7.1 7.4 7.1 7.2 7.1 6.6
22 6.4 8.4 7.0 7.5 7.0 7.4 7.0 6.6
23 6.4 8.3 7.6 8.3 7.0 7.2 7.0 7.4 7.0 6.4
24 6.3 8.3 7.0 7.6 7.0 7.3 6.9 6.5
25 7.3 1.6 6.3 8.2 6.5 7.7 6.5 7.6 7.5 8.3 6.9 7.5 7.0 7.2 6.9 6.4
26
27
28
29
30 6.3 8.1 7.6 6.5 6.5 7.7 7.3 8.0 6.8 7.4 6.9 0.1
31
32
33
34
35 7.2 6.4 6.4 0.0 7.3 8.0

Recent temperature and dissolved oxygen profile plots

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