Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
ORLAND HANCOCK 23 1 0.21 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
21 m
(69 ft) 		10 m
(33 ft) 		90 ha
(222 ac) 		9,095,924 m3
(7,374 ac-ft) 		2 km2
(0.9 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 11.0 11.3 11.5 2
1978 5.0 28 7.4 11.0 11.5 12.0 2 1 1.2 1.2 1.2
1979 6.5 9.4 11.5 4
1980 10.0 11.0 11.7 3
1981 5.0 36 7 12.0 8.3 10.6 11.4 5 1.2 1.2 1.2
1982 10.0 11.2 12.0 2
1983 5.0 32 3.5 9.6 12.0 4
1984 9.7 10.5 12.1 2 1
1985 2.0 27 1 9.5 11.2 11.9 12.5 5
1987 11.0 12.3 13.0 3
1988 4.0 24 3 9.0 10.0 12.0 14.0 1
1989 8.3 10.4 11.8 4
1991 6.0 25 6.8 4 11.0 11.8 13.0 4 1.0 1.0 1.0
1992 10.8 10.9 11.2 2
1994 11.9 12.6 12.8 3
2003 9.2 11.2 13.6 6
2004 7.0 4 7.1 8.6 10.6 5 1.0 1.0 1.0
2005 7.6 9.9 12.2 6
2006 6.8 8.4 12.1 6
2007
2008 4 4.7 26 6.8 3 9.4 10.2 11.2 4
2011 3 10.9 11.8 12.3 2
2012 10.9 11.2 11.8 3
2013 2 11.1 12.1 12.8 3
2014 8.5 8.8 9.2 2
2015 2 7.0 26 7.1 2 12.7 12.7 12.7 1 2.6 2.6 2.6
2016 9 6.0 22 7.2 4 10.2 10.2 10.2 1 1.1 1.1 1.1
2017 2 10.8 11.6 12.2 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
5 5 27 7 3.6 2.5 10 7.4 3.5 11 14 3.3 1 1.4 2.6

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2011-08-13
2012-08-02
2012-08-30
2013-08-04
2013-08-16
2013-09-07
2015-08-20
2016-08-22
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 23.0 8.1 24.2 8.1 23.6 8.7 23.5 8.4 22.6 8.9 22.1 8.6 25.4 8.4 24.1 8.6
1 23.0 8.1 24.2 8.1 23.6 8.1 23.5 8.4 22.6 8.9 22.1 8.6 25.5 8.4 24.1 8.6
2 22.9 8.1 24.2 8.1 23.6 8.1 23.4 8.5 22.4 8.9 21.9 8.7 25.5 8.3 24.1 8.6
3 22.9 8.1 24.2 8.1 23.6 8.1 23.4 8.4 22.3 8.9 21.9 8.7 25.5 8.3 24.1 8.6
4 22.8 8.1 24.2 8.1 23.6 8.1 23.3 8.5 22.3 8.9 21.9 8.7 25.5 8.5 24.1 8.6
5 22.8 8.2 24.2 8.1 23.6 8.1 23.3 8.4 22.3 8.9 21.9 8.7 25.5 8.5 24.1 8.5
6 22.8 8.1 24.1 8.1 23.6 8.1 23.2 8.5 22.3 8.9 21.8 8.6 24.2 8.5 24.1 8.5
7 21.3 10.0 21.3 10.1 23.5 8.7 20.9 10.2 22.1 9.0 21.7 8.6 22.7 9.1 24.0 8.5
8 17.1 11.5 17.0 11.7 20.5 10.9 16.7 12.4 18.9 12.5 21.6 8.6 18.3 11.9 21.5 11.1
9 13.3 12.3 12.2 14.4 16.1 11.9 13.8 14.0 14.9 14.0 17.6 13.1 14.8 12.7 18.1 12.1
10 11.8 12.1 12.1 12.9 14.2 11.9 12.0 13.4 13.1 14.2 14.1 13.5 12.5 13.0 15.1 12.5
11 10.5 11.4 12.0 12.0 13.2 11.4 11.1 12.8 11.6 13.8 12.6 12.5 11.1 13.4 13.8 12.5
12 9.9 10.8 11.5 10.9 12.5 9.4 10.4 11.8 10.9 12.6 11.9 12.4 10.6 12.8 13.1 12.0
13 9.4 10.8 11.1 10.6 11.8 9.3 10.0 11.9 10.4 12.5 11.2 11.2 9.9 12.3 12.0 11.0
14 8.9 9.9 10.6 8.8 11.1 7.1 9.5 10.8 9.8 10.7 10.7 10.6 9.4 11.5 11.1 8.3
15 8.6 9.5 10.3 8.2 10.6 5.8 9.2 10.1 9.5 9.4 9.9 8.5 8.9 11.0 10.3 7.7
16 8.4 9.2 10.0 7.1 10.2 4.5 9.0 9.2 9.2 8.9 9.5 6.9
17 8.7 8.1 9.9 6.9 10.0 3.0 8.8 8.3 8.9 7.2 9.4 5.9 8.4 9.5 9.8 5.5
18 7.6 8.1 9.8 6.5 9.8 2.2 8.7 7.6 8.9 6.8 9.2 5.0
19 7.3 8.0 9.7 5.8 9.8 1.9 8.6 7.1 8.8 6.1 9.1 3.8 8.2 9.0 9.5 3.6
20 6.7 8.0 9.7 5.4 8.6 7.0 9.5 3.3
21 6.7 7.9 8.2 8.2
22
23 8.2 8.0

Recent temperature and dissolved oxygen profile plots

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