Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
SURRY HANCOCK 23 1 0.6 flushes/yr 163 ft
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
2018 11 3.9 4.9 5.8 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 5.8 5.8 8.2 2.5 5.8 9.5 4.9 2.6 3.5 4.1

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2015-09-02
2015-09-08
2016-08-16
2017-08-15
2017-08-25
2018-08-03
2018-08-29
2018-09-14
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 24.0 7.2 24.6 7.7 24.8 8.7 24.0 7.3 22.7 7.5 27.1 7.1 25.2 7.7 21.8 7.8
1 24.0 7.4 24.6 7.7 24.8 8.6 24.0 7.3 22.8 7.4 27.0 6.4 25.1 7.7 21.8 7.5
2 24.0 6.9 24.4 7.7 24.8 8.6 23.8 7.2 22.8 7.4 26.7 7.0 25.0 7.4 21.7 7.4
3 23.9 6.9 24.0 7.6 24.8 8.6 23.8 7.1 22.8 7.3 25.8 7.0 23.9 7.6 21.2 6.8
4 23.9 7.3 23.7 7.6 24.8 8.6 23.2 7.1 22.8 7.6 25.0 6.7 23.6 7.4 21.1 6.8
5 23.8 7.2 23.4 7.3 24.3 8.3 22.7 6.8 22.8 7.3 23.9 6.6 23.1 7.2 20.9 7.3
6 20.9 4.9 22.9 6.9 20.8 6.3 22.1 6.5 21.6 6.8 21.5 5.6 23.0 7.0 20.9 6.6
7 18.7 4.3 18.6 4.4 17.7 6.0 18.5 4.9 20.0 5.6 15.6 5.8 18.6 4.3 19.6 4.8
8 14.9 5.0 13.3 5.6 12.7 6.8 14.0 5.6 17.4 4.8 12.8 6.4 13.6 5.1 15.8 3.6
9 11.5 5.9 11.7 6.1 12.2 7.3 11.0 6.3 11.8 5.6 10.7 6.6 11.2 6.0 11.4 5.0
10 9.5 6.9 9.6 7.0 10.4 7.8 10.3 6.7 9.4 6.5 9.1 7.5 9.3 6.7 9.6 5.7
11 8.6 7.0 8.8 7.4 9.9 8.1 9.1 7.2 9.0 6.8 8.1 7.6 7.8 7.2 8.7 5.9
12 8.0 7.4 8.1 7.6 9.3 8.2 8.4 7.3 8.5 7.2 7.7 7.8 7.3 7.7 7.9 6.6
13 7.6 7.4 7.8 8.1 9.0 8.3 8.0 7.5 8.0 7.7 7.2 8.3 7.0 7.2 7.3 6.5
14 7.3 7.8 7.6 7.5 8.6 8.3 7.7 7.3 7.9 7.4 7.0 8.0 6.9 7.6 7.1 6.8
15 7.1 7.7 7.3 7.4 8.5 8.3 7.5 7.6 7.6 7.4 6.9 8.0 6.7 7.5 6.8 6.8
16 7.0 7.6 7.2 7.4 7.4 7.5 7.5 7.4 6.7 7.9 6.6 7.6 6.7 6.6
17 7.0 7.5 7.0 7.6 8.3 8.2 7.3 7.4 7.4 7.3 6.6 7.8 6.5 7.3 6.6 6.4
18 6.9 7.6 6.9 7.5 7.2 7.6 7.3 7.4 6.5 8.0 6.5 7.5 6.5 6.6
19 6.9 7.6 6.8 7.6 7.9 8.3 7.2 7.6 7.3 7.3 6.5 8.1 6.4 7.4 6.5 6.6
20 6.9 7.6 6.8 7.7 7.2 7.5 7.2 7.2 6.4 8.0 6.4 7.5 6.4 6.6
21 6.7 7.6 7.7 8.3 7.1 7.4 7.1 7.2 6.4 8.0 6.4 7.5 6.4 6.8
22 7.0 7.5 7.0 7.4 6.4 8.0 6.4 7.7 6.3 6.9
23 7.6 8.3 7.0 7.2 7.0 7.4 6.3 8.3 6.3 7.6 6.3 6.7
24 7.0 7.6 7.0 7.3 6.3 8.0 6.2 7.6 6.2 6.5
25 6.5 7.7 6.5 7.6 7.5 8.3 6.9 7.5 7.0 7.2 6.3 8.0 6.2 7.6 6.2 6.6
26
27
28
29
30 7.6 6.5 6.5 7.7 7.3 8.0 6.8 7.4 6.9 0.1 6.1 4.2 6.3 0.2
31
32
33
34
35 7.2 6.4 6.4 0.0 7.3 8.0

Most recent temperature and dissolved oxygen profile plots

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