Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
ISLE AU HAUT KNOX 9 1 NA flushes/yr 15 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
18 m
(59 ft) 		7 m
(23 ft) 		30 ha
(73 ac) 		NA m3
(NA ac-ft) 		NA km2
(NA 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
1994 2.0 86 6.2 3 8.1 8.1 8.1 1 2.0 2.0 2.0
2008 1.5 84 5.9 5.6 5.6 5.6 1
2009 79 5.7 6 4.5 4.6 4.6 1
2010 79 6.7 6.0 7.8 10.6 3
2011 83 6.3 4 6.2 8.0 9.4 2 1.5 1.5 1.5
2012 1.9 81 6.2 5.8 5.8 5.8 1
2014 87 6.1 7.3 7.4 7.4 1
2015 7.8 8.2 8.5 1
2016 7.0 8.0 10.7 9
2017 2.9 8.3 10.6 8
2018 6.2 7.7 8.4 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
1.8 83 6.1 3.5 6 2.9 7.2 11 3.1 1.5 1.8 2

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2009-08-24
2010-08-12
2011-08-11
2011-08-31
2012-09-12
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 23.6 8.3 21.9 7.9 20.5 7.9 21.6 8.5 20.7 8.6
1 23.6 8.3 21.9 8.0 20.5 8.0 21.5 8.5 20.7 8.2
2 23.6 8.3 21.9 8.0 20.5 8.0 21.4 8.5 20.5 7.9
3 23.4 8.3 21.9 7.9 20.5 8.0 21.4 8.5 20.4 8.0
4 22.4 7.9 21.8 8.0 20.5 7.9 21.4 8.5 20.3 7.8
5 20.5 7.2 21.7 8.0 20.5 7.9 21.4 8.5 20.3 7.9
6 17.9 5.0 21.4 7.9 20.5 7.9 21.3 8.5 20.3 7.8
7 16.5 4.0 21.3 7.9 20.3 7.9 21.2 8.4 20.2 7.8
8 15.9 3.8 20.7 7.7 19.0 8.1 21.0 8.4 19.7 6.7
9 14.6 3.6 15.9 8.6 13.6 9.8 18.1 8.2 14.4 2.2
10 13.2 3.0 12.4 7.8 12.0 8.1 14.1 6.5 12.6 0.7
11 11.8 2.9 10.2 7.4 10.9 7.4 12.6 6.1 11.8 0.5
12 10.3 3.9 8.6 8.5 9.5 7.6 11.1 5.4 10.7 0.2
13 8.5 1.5 7.2 5.2 8.1 5.9 10.1 4.5 9.8 0.4
14 7.9 0.8 6.1 0.6 7.2 2.1 8.8 1.2 9.2 0.5
15 7.7 0.4 5.6 0.0 6.7 0.2 8.2 0.4 8.7 0.2
16 7.6 0.3 5.4 0.0 6.3 0.2 7.9 0.2 8.4 0.3
17 7.6 0.2 5.3 0.0 7.7 0.2 8.4 0.1

Most recent temperature and dissolved oxygen profile plots

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