Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
ORLAND HANCOCK 23 1 7.06 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
8 m
(28 ft)
5 m
(15 ft)
399 ha
(986 ac)
18,869,554 m3
(15,298 ac-ft)
53 km2
(20 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 10 3.0 3.8 4.5 5
1978 8 42 12 3.0 4.2 5.5 6 3.0 3.0 3.0
1979 10 2.9 4.1 5.5 8
1980 4.0 4.2 4.5 2
1981 8 39 14 3.5 4.0 4.7 4 5.2 5.2 5.2
1982 3.2 4.5 6.0 4
1983 3.7 4.9 6.3 5
1984 3.6 4.5 5.6 6
1985 7 36 6 7 4.2 5.0 5.8 5
1986 13 39 8 3.5 4.6 5.4 6 1.1 2.2 3.6
1987 3.7 4.5 5.5 6
1988 3.7 4.5 5.6 5
1989 3.5 4.2 5.0 5
1990 3.5 3.8 4.4 4
1991 11 41 6.7 8 5.8 5.8 5.8 1
1993 4.5 5.7 6.9 5
1994 7.2 7 4.5 5.4 7.3 4 3
1995 4.8 5.1 5.9 2
1997 10 45 7.3 7 4.3 5.3 5.9 1 3.2 3.2 3.2
1999 5.2 6.0 6.2 3
2003 4.2 5.0 5.4 4
2004 20 10 53 7.2 8 5.0 5.0 5.0 1 3.5 3.5 3.5
2007
2008 5.1 5.2 5.6 2
2009 9 3.8 4.4 4.7 2
2010 9 4.5 5.4 6.0 3 3.1 3.1 3.1
2011 11 3.5 4.3 5.9 7 1.6 3.3 4.6
2012 14 14 3.4 4.7 6.3 8 1.8 2.4 3.2
2013 28 10 48 7.2 9 4.2 4.7 5.7 8 4.8 4.8 4.8
2014 3.8 4.8 6.4 9
2015 2.6 4.7 5.8 6
2016 15 10 52 7.2 11 3.1 5.0 6.6 12 4 4.8 4.8 4.8
2017 17 10 55 7.2 13 3.5 4.7 6.5 8 3.0 4.4 5.7

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
20 9.9 45 7.1 9.9 8.5 10 14 2.6 4.7 7.3 4.9 1.1 3.6 5.7

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2016-08-15
2016-08-23
2016-09-08
2016-09-21
2017-08-01
2017-08-16
2017-09-11
2017-09-27
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 25 8.4 24 8.5 23 8.5 22 8.3 25 8.0 24 8.4 20 9.0 23 10.1
1 25 8.4 24 8.2 23 8.5 22 8.3 24 8.0 24 8.4 20 8.9 23 10.1
2 25 8.4 24 8.1 23 8.5 21 8.4 24 7.9 24 8.3 20 8.9 22 10.1
3 25 8.3 24 8.1 23 8.5 21 8.3 24 7.8 24 8.3 20 8.9 21 10.0
4 25 8.3 23 8.0 23 8.4 21 8.2 23 7.3 24 8.3 20 8.9 21 9.8
5 25 8.3 23 8.0 23 8.0 21 8.0 23 6.4 24 8.2 20 8.8 20 9.2
6 24 7.5 23 8.0 22 7.9 21 7.7 22 4.8 23 7.6 20 8.8 20 7.2
7 24 7.1 24 8.0
8 24 8.0

Recent temperature and dissolved oxygen profile plots

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