Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
LEE PENOBSCOT 44 1 0.87 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
9 m
(29 ft)
4 m
(13 ft)
216 ha
(534 ac)
8,811,728 m3
(7,144 ac-ft)
14 km2
(5.3 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
1977 7 5.0 6.2 7.0 4 1
1984 4.5 5.9 6.5 4
1985 6.0 6.0 6.0 1
1987 24 74 8 7.0 7.0 7.0 1
2004 5.2 6.1 8.0 6
2005 8 27 79 7.8 4 5.6 6.3 7.0 7
2006 5.6 6.4 7.3 5
2007 5.7 6.4 7.0 5
2008 5.4 6.2 6.9 5
2009 5 5.1 6.2 6.7 5
2010 6 5.2 6.2 7.5 7 2.7 2.7 2.7
2011 5 5.4 7.0 8.3 6 1.9 1.9 1.9
2012 6.0 6.9 7.7 6
2013 6.9 7.5 8.4 5
2014 6.2 7.1 8.3 6
2015 11 28 66 7.2 4 6.2 7.1 8.2 5 1.6 1.6 1.6
2016 6.3 7.2 8.0 8
2017 7.0 7.7 8.2 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
9.5 26 73 7.4 6 4.5 4.5 6.6 8.4 4.9 1.6 2.1 2.7

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1987-08-20
2010-08-24
2011-08-17
2015-08-11
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO
0 24 8.2 23 8.0 23 8.4 23 8.5
1 24 8.3 22 8.0 23 8.4 23 8.5
2 24 8.3 22 8.0 23 8.4 23 8.4
3 24 8.3 22 8.0 22 8.4 23 8.4
4 24 8.3 22 8.0 22 8.5 23 8.4
5 22 8.3 22 7.8 22 8.5 23 8.4
6 22 8.2 22 7.8 22 8.5 23 8.3
7 22 8.1 22 7.8 21 5.5 22 8.1
8 21 7.4 22 7.8 18 1.0
9 21 4.2

Recent temperature and dissolved oxygen profile plots

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