Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
HOPE KNOX 14 1 1.5 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
6 m
(20 ft) 		3 m
(10 ft) 		106 ha
(262 ac) 		3,422,971 m3
(2,775 ac-ft) 		7 km2
(2.7 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
1983 8.0 6.5 51 2.8 5.6 6.8 6 3 2.0 2.0 2.0
1984 12.4 19 41 4.8 5.8 6.8 7 1
1985 3.8 6.3 7.3 7 4 3.0 3.0 3.0
1986 6.5 35 18.0 5 3.8 6.1 7.1 7 2 1.5 1.9 3.6
1987 8.2 38 13.0 10 17 3.3 5.6 6.8 6 2
1988 5.8 6 4.0 5.1 6.5 7 1
1989 3.3 4.9 6.0 6
1990 4.0 5.3 6.0 4
1991 8.0 32 7.2 11.0 4.0 5.9 7.2 6 1
1992 4.0 5.6 6.5 6
1993 5.0 5.4 6.0 3
1994 3.0 4.2 6.0 7
1995 2.0 4.7 6.0 6
1996 3.7 4.4 5.8 5
1997 4.3 5.1 5.7 6
1998 9.5 37 7.0 3.4 5.4 6.6 8 2 2.0 2.0 2.0
1999 1.9 5.0 6.6 7
2000 2.1 4.0 5.1 5
2001 3.1 4.4 5.3 6
2002 9 10.5 45 9.0 4.4 5.3 6.5 7 3.0 3.0 3.0
2003 4.0 5.0 5.7 4
2004 2.9 4.4 5.1 5
2005 3.8 5.1 5.8 5
2011 17.0 5.7 5.7 5.7 1 6.8 6.8 6.8
2017 11.0 6.2 6.2 6.2 1 1 1.3 1.3 1.3

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
9 8.1 32 7.1 12 11 36 1.9 5.2 7.3 5.5 1.3 2.9 6.8

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1983-09-15
1986-08-21
1987-08-07
1987-08-20
1991-09-06
1998-08-13
2002-08-12
2011-08-10
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 20 9.0 22 8.5 22 9.1 24 8.5 21 8.6 23 7.8 25 8.0 24 7.3
1 20 8.9 22 8.5 22 9.0 24 8.4 21 8.5 23 7.8 25 8.0 24 7.2
2 20 8.9 22 8.5 22 9.1 24 8.7 21 8.5 23 7.7 24 8.0 24 7.2
3 20 8.9 22 8.5 22 9.1 24 8.7 21 8.5 23 7.7 24 8.0 24 7.3
4 20 8.9 21 8.4 22 9.0 24 8.9 21 8.5 23 7.7 24 7.9 24 7.2
5 20 8.9 21 8.4 22 9.0 23 9.0 21 8.5 23 7.7 23 7.9 24 7.2
6 20 8.8 21 8.5 22 8.1 22 7.5 20 8.4 22 7.6 23 5.6 24 7.1

Recent temperature and dissolved oxygen profile plots

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