Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
SUMNER OXFORD 11 1 0.75 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
15 m
(50 ft) 		6 m
(18 ft) 		63 ha
(156 ac) 		3,515,648 m3
(2,850 ac-ft) 		4 km2
(1.6 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 5.0 6.8 8.0 5
1983 5.5 2.0 7.0 8.2 8.4 8.6 1 1.6 1.6 1.6
1984 13.0 12.5 8.7 8.7 8.7 1 1.9 1.9 1.9
1985 8.4 8.6 8.7 2
1986 6.3 6.9 7.5 2
1987 4.0 11.0 8.5 8.5 8.5 1 2.5 2.5 2.5
1990 6.0 6.6 6.6 6.6 1
1991 6.6 5.8 11.0 6.3 7.6 8.4 5
1992 6.0 6.5 4.7 7.0 7.9 8.9 5
1993 6.2 6.2 5.5 10.0 6.2 8.1 9.5 3 2.5 2.9 3.3
1995 6.6 4.4 8.5 6.6 8.5 9.7 5
1997 7.0 7.0 5.5 8.8 5.2 6.9 8.0 4 3.0 3.3 3.7
1998 13.0 6.8 5.0 6.0 6.0 6.0 6.0 1 3.5 3.5 3.5
1999 6.5 6.8 6.6 8.0 6.0 6.7 7.8 5 1.7 3.1 4.0
2000 7.6 6.7 8.8 9.0 5.2 6.0 6.8 5 2.7 4.7 5.8
2001 6.0 6.8 7.0 8.0 5.9 6.8 7.9 5 1.5 1.7 1.9
2002 7.0 6.8 7.0 11.0 5.4 6.6 7.0 5 2.2 3.1 4.3
2003 6.2 25 6.8 6.4 5.5 7.3 8.2 5 1.6 2.6 4.1
2004 6.9 6.7 5.2 9.0 7.0 7.4 8.3 5 1.6 2.3 2.8
2005 5.4 15 6.7 6.5 16.0 6.7 7.1 8.0 4 1.5 2.4 3.4
2006 6.3 7.2 5.8 10.0 6.0 6.9 7.6 4 2.6 2.7 2.9
2007 6.0 6.6 7.3 6.4 7.2 7.6 3 1.6 2.1 2.5
2008 6.7 7.4 6.5 7.3 8.4 5 1.8 2.9 3.6
2009 7.0 6.9 4.6 7.0 6.4 7.3 8.8 5 2.0 3.0 4.0
2010 6.5 6.0 10.0 6.9 7.5 8.3 5 2.0 2.3 2.5
2011 6.5 6.8 4.8 6.6 7.7 6 1.4 2.6 4.7
2012 9 5.7 22 7.0 4.4 9.5 6.0 7.0 8.0 5 2.0 3.5 5.7
2013 7.5 6.0 9.0 5.8 6.5 7.3 5 1.7 2.6 3.7
2014 7.0 23 5.2 8.0 6.7 7.1 7.5 5 1.7 3.0 5.1
2015 8.5 22 4.4 12.0 6.6 7.6 8.8 5 2.6 3.6 4.2
2016 3 6.5 27 7.2 5.2 10.0 7.7 8.2 8.6 5 1.3 1.7 2.1
2017 5.0 53 7.1 5.6 10.0 5.4 6.8 7.8 5 2.0 2.5 3.0

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 6.8 27 6.7 5.9 9.6 4.8 7.3 9.7 4 1.3 2.7 5.8

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2014-08-25
2014-09-28
2015-08-25
2015-09-17
2016-08-25
2016-09-29
2017-08-19
2017-09-22
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 24.8 8.4 21.2 9.2 25.2 7.9 24.5 8.5 24.8 8.5 18.8 9.2 23.5 8.3 20.8 9.4
1 23.8 8.6 18.6 9.6 25.2 7.9 23.5 8.6 24.3 8.5 18.8 9.2 22.8 8.5 20.7 9.4
2 23.0 8.6 18.0 9.7 25.2 8.0 23.1 8.7 24.2 8.5 18.7 9.2 22.6 8.5 20.5 9.4
3 22.7 8.7 17.5 9.8 25.2 8.0 23.0 8.7 24.1 8.5 18.6 9.2 22.6 8.5 20.5 9.4
4 22.5 8.7 17.0 9.8 25.1 8.0 22.8 8.6 23.8 8.5 18.6 9.2 22.5 8.5 20.1 9.5
5 21.8 8.7 16.8 9.8 24.0 8.0 22.6 8.6 23.7 8.5 18.6 9.2 22.3 8.4 19.8 9.7
6 17.3 11.7 16.6 9.6 20.5 11.1 22.2 8.7 22.9 8.6 18.6 9.1 16.9 12.4 19.0 9.2
7 12.7 10.0 16.0 9.2 15.9 12.3 17.2 12.4 18.6 11.5 18.5 9.1 12.5 12.7 16.7 10.8
8 9.5 7.0 12.2 5.7 11.9 10.2 13.2 9.4 14.1 9.4 18.1 8.9 10.2 10.7 12.5 11.3
9 8.3 4.8 9.1 3.4 9.7 6.6 10.6 6.0 11.7 6.4 13.6 5.4 8.9 8.1 9.8 7.2
10 8.0 3.7 8.3 2.4 9.0 4.8 9.5 3.0 10.5 4.4 11.2 2.0 8.2 5.4 8.7 4.2
11 7.8 3.3 8.0 1.8 8.6 3.2 8.9 1.3 9.9 2.7 10.2 0.1 7.9 4.3 8.3 2.6
12 7.6 2.9 7.8 1.6 8.4 2.7 8.5 0.8 9.6 2.1 9.6 0.0 7.7 3.9 8.1 1.9
13 7.5 2.6 7.7 1.5 8.2 2.2 8.4 0.5 9.2 1.3 9.6 0.0 7.6 3.2 7.9 1.1
14 7.5 2.5 7.7 1.4 8.1 1.9 8.2 0.3 9.1 1.0 7.5 2.8 7.8 0.8
15 7.5 2.3 7.6 1.4 8.1 1.8 9.0 0.9 7.7 0.2
16 7.3 1.6

Recent temperature and dissolved oxygen profile plots

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