Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
HOPE KNOX 14 1 5.4 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
9 m
(30 ft) 		4 m
(13 ft) 		62 ha
(153 ac) 		2,500,113 m3
(2,027 ac-ft) 		2 km2
(1 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
1984 5.0 5.2 6.0 5
1985 5.0 7 6.1 6.1 6.1 1
1991 5.5 6.3 7.0 6
1992 5.5 7.0 8.3 5
1993 5.0 6.8 8.0 5
1994 6.3 6.4 6.8 3
1995 6.0 6.9 7.8 6
1996 6.0 6.9 8.0 6
1997 5.7 6.5 7.0 4
1998 6.8 33 9 9 6.0 6.9 8.0 7 4.7 4.7 4.7
1999 6.0 6.6 7.8 6
2000 6.2 7.0 8.0 5
2001 6.0 6.5 6.9 4 1
2002 6.4 7.2 7.9 3
2003 8 8.5 40 3 6.2 6.9 7.8 3 1 0.7 0.7 0.7
2004 5.8 6.1 6.4 4
2005 5.3 6.6 7.3 3 1
2006 6.3 6.8 7.2 4
2007 9 8.3 36 6.9 8 5.5 6.4 7.3 4 2
2010 6 13 6.7 6.7 6.7 1 2.3 2.3 2.3
2015 6.6 7.4 8.4 5
2016 6.3 7.2 8.1 3
2017 6 8.0 44 6.8 6 6.6 7.3 8.2 4 3.0 3.0 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
7.7 7.3 38 6.8 6.2 8 11 5 6.7 8.4 4.2 0.7 2.7 4.7

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1985-08-09
1998-08-13
2003-08-21
2010-09-01
2017-08-22
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 22 8.7 25 7.9 27 7.4 26 8.00 24 8.4
1 23 8.7 25 7.9 26 7.4 26 8.10 24 8.3
2 22 8.7 24 7.9 26 7.4 25 8.10 24 8.3
3 22 8.7 24 7.9 25 7.4 24 8.10 24 8.3
4 22 8.6 24 7.9 25 7.3 23 8.10 23 8.1
5 22 8.6 23 7.6 24 6.8 23 7.80 23 7.4
6 21 7.5 20 5.1 20 2.7 22 5.30 20 2.8
7 20 6.2 17 1.5 17 0.5 21 2.90 16 0.8
8 14 0.2 16 0.25 14 0.6

Recent temperature and dissolved oxygen profile plots

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