Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
T09 R12 WELS PISCATAQUIS 56 1 5.33 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
19 m
(62 ft)
6 m
(21 ft)
1,309 ha
(3,234 ac)
68,105,013 m3
(55,214 ac-ft)
180 km2
(70 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
1982 12 33 9 11 4.0 4.0 4.0 1 2.6 2.6 2.6
1987 2.8 3.1 3.5 6
1988 2.9 3.4 4.0 6
1989 16 33 7 3.1 3.5 4.5 5 2.9 2.9 2.9
1990 2.9 3.8 4.4 6
1991 3.2 3.6 3.9 6
1992 2.8 3.2 3.6 6
1993 3.6 4.3 4.9 6
1994 4.0 4.7 5.0 3
1995 3.6 4.7 5.4 4
1996 14 40 7 8 2.4 3.5 5.1 6 3.1 3.1 3.1
1997 3.0 3.8 5.3 6
1998 3.4 4.1 5.0 6
1999 3.7 4.4 5.1 5
2000 4.0 4.4 5.2 5
2001 16 41 7.5 6 3.6 4.3 5.0 5 4.2 4.2 4.2
2003 3.6 3.9 4.5 4
2004 3.6 4.1 4.3 5
2005 3.2 3.9 4.6 6
2006 39 14 38 7.3 8 3.2 4.0 4.7 6 2.0 2.0 2.0
2007 3.5 4.2 5.2 6
2008 3.6 3.9 4.8 6
2009 3.5 3.9 4.5 5
2010 3.2 3.9 4.3 6
2011 47 14 36 7.3 8 2.8 3.3 3.8 6
2012 3.6 4.3 5.5 6
2013 3.3 3.6 4.2 3
2015 3.4 4.1 4.9 2
2016 3.5 3.9 4.2 6
2017 3.8 4.2 5.0 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
43 14 37 7.4 7.4 8 9.5 2.4 3.9 5.5 5.2 2 3 4.2

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1982-08-16
1989-08-18
1996-08-27
2001-08-22
2006-08-16
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 19 8.8 22 8.5 20 8.4 22.3 8.8 19.7 8.9
1 19 8.8 22 8.5 20 8.4 22.1 8.7 19.7 8.9
2 19 8.8 20 8.4 21.8 8.6 19.7 8.9
3 19 8.8 22 8.4 20 8.3 21.5 8.5 19.6 8.9
4 18 8.6 20 8.2 21.4 8.5 19.4 8.8
5 18 8.6 21 8.3 20 8.1 21.3 8.5 19.1 8.7
6 18 8.6 20 7.8 21.1 8.3 19.0 8.7
7 18 8.4 20 6.8 20 7.4 19.9 6.7 18.8 8.6
8 18 8.3 19 7.3 17.9 5.2 18.4 8.4
9 18 7.9 14 4.0 16 4.4 15.0 4.6 14.2 4.5
10 16 6.6 15 4.2 13.3 4.5 11.9 4.5
11 14 5.1 12 3.8 13 3.6 12.4 4.5 10.8 4.4
12 12 4.8 12 3.2 11.1 4.3 10.5 4.3
13 10 3.3 12 2.5 10.9 4.3 10.4 4.2
14 10 3.4 11 2.3 10.5 4.0 10.2 4.0
15 10 3.3 11 2.1 10.1 3.9 10.1 4.0
16 10 2.6 11 0.4 10.1 3.8 10.0 3.7
17 9.9 3.3 9.9 3.3
18 10 2.8

Recent temperature and dissolved oxygen profile plots

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