Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
HOPE KNOX 14 1 0.59 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
24 m
(78 ft) 		8 m
(26 ft) 		241 ha
(595 ac) 		19,352,400 m3
(15,689 ac-ft) 		10 km2
(3.7 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
1981 6.0 7.5 9.5 3
1982 5.0 36 5 11 5.5 6.8 8.3 5 1.6 1.6 1.6
1983 5.5 6.4 8.0 5
1984 6.0 6.6 8.3 3
1985 4.0 25 3 10 7.4 7.8 8.2 3
1986 4.4 6.5 8.9 6
1987 5.0 5.8 7.1 3
1988 5.0 27 15 16 6.0 7.3 8.0 5
1989 4.6 6.4 7.8 7
1990 5.6 7.0 9.1 6
1991 6.0 29 7.0 4 5.0 6.8 9.0 5
1994 6.0 5 6 7.8 8.3 8.9 2 2.1 2.1 2.1
1995 5.8 7.4 9.4 6
1996 9 5.3 6.4 8.0 6
1997 5.6 7.3 9.3 7
1998 6.1 7.5 9.3 5
1999 13.0 31 5 6.0 7.2 8.9 7 1.1 1.1 1.1
2000 6.6 7.6 8.2 6
2001 7.5 8.5 9.8 6
2002 8.0 9.2 10.1 5
2003 7.2 8.3 9.2 5
2004 7 11.2 38 6.8 3 5.8 7.6 9.1 6 1.8 1.8 1.8
2005 4.2 7.6 8.7 4
2006 6.5 7.3 9.2 3
2007 6.7 8.6 9.9 4
2008 8 4.2 35 6.5 3 7.3 8.3 9.9 4
2009 6.2 6.9 8.0 5
2010 6.3 7.9 8.7 4
2011 7.2 8.3 9.1 5
2012 6.5 8.8 10.3 4
2013 8 5.5 34 7.1 7 6.1 7.8 8.7 4 1.7 1.7 1.7
2014 7.2 7.9 8.6 2
2015 5 6.5 35 7.1 3 7.4 8.2 9.2 4 1.0 1.0 1.0
2016 7.3 8.6 10.3 6
2017 7.9 9.3 10.0 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
7 6.6 30 6.9 5.6 3 11 4.2 7.6 10 4.8 1 1.6 2.1

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1985-08-29
1988-08-31
1991-09-06
1994-08-22
1999-08-10
2004-08-18
2013-08-13
2015-08-24
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 21.3 8.7 22 9.7 21.0 8.8 22 8.9 22.4 8.2 22.5 8.3 23.0 8.4 25.0 8.5
1 21.0 8.8 22 8.9 22.4 8.2 22.4 8.2 22.9 8.4 24.9 8.5
2 21.3 8.6 22 9.6 21.0 8.8 22 8.8 22.4 8.3 22.4 8.2 22.9 8.4 24.8 8.5
3 21.0 8.8 22 8.8 22.4 8.3 22.3 8.2 22.8 8.4 24.7 8.5
4 21.3 8.5 22 9.6 20.9 8.8 22 8.9 22.4 8.3 22.3 8.2 22.4 8.5 24.7 8.5
5 20.9 8.8 22 8.8 22.4 8.4 22.2 8.2 22.2 8.5 24.7 8.5
6 21.4 8.5 22 9.5 20.8 8.8 22 8.9 22.3 8.3 22.1 8.3 21.2 8.9 24.5 8.6
7 20.8 8.8 22 8.9 22.2 8.3 19.2 9.7 15.6 11.2 19.4 10.2
8 21.3 8.5 22 9.8 20.3 8.6 17 11.0 17.6 11.2 15.3 11.3 12.3 11.2 14.4 10.8
9 19.1 9.5 15 9.9 17.0 7.9 14 10.5 14.4 11.3 12.9 6.9 11.1 10.2 11.6 9.1
10 16.3 8.3 14 7.8 13.0 5.9 13 8.5 12.3 10.0 11.3 4.2 9.9 8.1 10.2 8.1
11 14.0 5.4 12.0 5.3 12 6.9 11.6 8.4 10.3 3.5 9.6 7.6 9.7 7.4
12 13.0 4.7 12 6.2 11.0 4.4 11 6.0 10.8 6.7 9.7 3.1 9.0 7.0 8.9 6.6
13 10.2 3.9 11 5.7 10.0 5.7 9.2 3.1 9.1 6.6 8.4 6.1
14 11.0 3.5 11 4.8 9.9 3.5 11 5.2 9.9 5.3 9.0 3.0 8.6 6.9 8.2 5.9
15 9.8 3.3 10 4.9 9.8 5.4 8.9 3.0 8.5 6.7 8.0 5.7
16 10.3 2.8 10 4.8 9.3 3.2 9.7 5.2 8.8 2.9 8.5 6.3
17 9.1 3.1 9.6 5.2 8.7 2.8 7.9 5.5
18 10.0 2.4 10 4.3 9.0 2.9 9.6 5.1 8.7 2.8
19 9.5 4.9 8.6 3.0 7.7 5.2
20 9.8 1.8 10 4.2 9.0 2.8 10 4.6 9.5 4.9 8.6 2.9
21 10 4.3 9.5 4.9 8.5 2.7 7.7 5.1
22 9.0 2.6 9.5 0.3 8.5 2.6
23 8.5 2.5 7.6 4.8
24 10 2.9 8.9 2.4 7.6 4.6

Recent temperature and dissolved oxygen profile plots

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