Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
OTIS HANCOCK 24 1 0.23 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
32 m
(104 ft)
12 m
(38 ft)
547 ha
(1,351 ac)
64,100,000 m3
(51,967 ac-ft)
20 km2
(7.8 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
1974 4.0 7.3 8.3 10.9 6 0.7 1.4 1.8
1975 5.1 7.7 8.7 10.7 7 0.8 1.5 2.2
1976 5.2 27 6.0 7.7 8.7 10.5 9 0.9 1.6 2.1
1977 2 6.0 7.4 8.5 4
1978 8.0 8.7 9.0 3
1979 7.0 7.1 7.2 1
1980 4.0 24 6.0 9 8.5 9.3 10.0 4 1.2 1.2 1.2
1981 9.1 9.3 9.5 5
1982 7.9 8.7 10.1 6
1983 5.0 6.0 6 6.1 8.1 10.0 5 1.1 1.1 1.1
1988 5.0 24 4.0 10 8.0 9.5 10.5 2
1989 4.9 7.2 8.2 6
1990 5.0 6.7 8.7 4
1991 6.0 24 6.8 4.0 9.2 9.2 9.2 1
1995 9.0 3.0 8.5 9.2 10.2 3
1996 7.0 30 4.5 5 6.3 8.4 10.9 5 1.6 1.8 2.0
1999 5.5 31 5.0 13.1 13.1 13.1 1 1.7 1.7 1.7
2003 9.4 11.4 12.1 3
2004 4 8.0 34 6.9 4.0 8.0 9.1 10.2 3 1.8 1.8 1.8
2007 8.2 8.6 9.0 3
2008 8.9 9.3 9.8 2
2009 10.2 10.4 10.9 2
2010 8.0 9.7 11.5 5
2011 7 5.6 33 7.0 3.0 8.0 9.1 10.3 5
2012 8.6 9.8 11.0 5
2013 7.4 8.3 9.2 4
2014 6.0 8.1 9.6 4
2015 8.0 8.8 9.8 2
2016 8 8.0 34 7.1 6.0 8.9 10.4 11.2 4 2.2 2.2 2.2
2017 8.5 10.2 11.6 6

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
6.3 6.2 29 7 4.9 4 6.4 4.9 9 13 4 0.7 1.6 2.2

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2014-08-04
2014-09-01
2015-08-13
2015-08-27
2016-09-01
2017-08-09
2017-09-09
2017-09-23
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 24.4 8.2 23.7 8.5 23.9 8.3 24.1 8.1 23.3 8.8 23.2 8.3 20.0 8.9 21.3 8.9
1 24.3 8.3 22.4 8.6 23.8 8.3 24.1 8.1 23.3 8.8 23.0 8.3 19.9 8.9 20.3 8.9
2 24.1 8.3 22.3 8.6 23.0 8.3 24.0 8.1 23.1 8.8 22.9 8.3 19.8 8.9 20.1 9.0
3 23.9 8.3 22.2 8.5 22.9 8.3 23.9 8.1 23.0 8.8 22.8 8.3 19.6 8.9 20.0 9.0
4 23.7 8.3 22.1 8.5 22.9 8.3 23.8 8.1 22.9 8.8 22.8 8.3 19.5 8.9 19.9 9.0
5 23.7 8.2 21.9 8.5 22.7 8.3 23.7 8.1 22.9 8.7 22.8 8.3 19.4 8.9 19.8 9.0
6 22.9 8.1 21.7 8.4 22.7 8.3 23.6 8.0 22.8 8.7 22.8 8.2 19.3 8.9 19.8 9.0
7 20.2 8.5 21.5 8.3 22.6 8.2 23.2 7.8 22.7 8.7 22.7 8.2 19.3 8.8 19.8 9.0
8 17.4 8.6 20.6 7.9 20.8 8.2 21.6 7.9 22.5 8.6 19.4 8.5 19.2 8.8 19.5 8.8
9 14.4 8.7 16.2 7.4 17.6 8.4 17.4 8.0 22.2 8.5 16.3 9.0 19.1 8.7 19.2 8.7
10 12.9 9.0 14.1 7.6 15.5 8.4 15.3 7.7 18.6 8.6 13.6 9.3 18.6 8.6 18.8 8.6
11 10.9 9.3 11.4 8.1 12.8 8.6 13.5 8.2 15.0 8.2 11.9 9.2 16.8 8.3 15.9 7.7
12 9.7 9.7 9.8 8.7 11.6 8.9 11.8 8.4 12.1 7.9 11.1 9.1 13.1 8.3 12.9 7.8
13 8.8 9.8 9.1 8.9 10.8 9.0 10.6 8.8 11.2 7.9 10.4 9.2 10.8 8.4 11.2 7.9
14 8.3 10.0 8.5 9.1 9.9 8.9 10.2 8.7 10.8 8.1 9.8 8.9 10.3 8.2 10.3 7.8
15 8.0 10.0 8.2 9.3 9.6 8.9 9.9 8.6 10.7 8.1 9.4 9.0 9.6 8.2 9.8 7.8
16
17 9.9 8.2
18
19 9.6 8.2
20 7.2 10.3 7.2 9.4 7.5 9.6 7.8 9.2 8.0 9.1 8.2 8.2 8.1 7.9
21 9.2 8.1
22
23 8.8 7.8
24
25 6.8 9.8 6.8 8.6 6.9 9.0 7.0 8.7 8.7 7.6 7.4 8.6 7.5 7.6 7.5 7.3
26
27
28 6.7 8.4
29 6.7 9.0 6.7 7.9 6.8 8.1 8.4 6.5
30 7.3 7.3 7.3 6.6 7.4 6.1

Recent temperature and dissolved oxygen profile plots

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