Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
DEXTER PENOBSCOT 32 1 0.39 flushes/yr 433 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
26 m
(86 ft) 		9 m
(31 ft) 		417 ha
(1,030 ac) 		39,117,152 m3
(31,713 ac-ft) 		26 km2
(9.8 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
1975 4.4 7.6 11.0 6
1976 29 78 7.0 6.5 5.3 7.8 9.4 7 1.3 1.8 2.4
1977 10 4.2 4.2 4.2 1
1981 27 64 11.9 9 4.5 7.0 9.8 5 0.7 1.4 1.8
1983 8.5 8.5 8.5 1
1984 7.0 7.0 7.0 1
1985 26 87 3.0 12 8.5 8.5 8.5 1
1989 28 40 5.0 9.8 9.8 9.8 1 0.9 0.9 0.9
1991 31 112 7.9 7.5 7.0 8.1 10.0 5 1.4 1.4 1.4
1992 5.0 8.8 11.0 4
1993 7.5 9.6 11.0 5
1994 7.0 7.9 9.0 6
1995 6.0 9.0 10.1 5
1997 7.0 7.3 7.7 4
1998 34 91 6.0 9.1 9.1 9.1 1 1.3 1.3 1.3
2000 35 92 5.0 9.1 9.1 9.1 1 13.0 13.0 13.0
2001 9.3 10.2 11.0 5
2002 8.4 10.0 10.9 5
2003 6.5 8.1 9.7 5
2004 4.5 8.4 10.5 5
2005 6 31 104 7.8 6 5.2 7.4 9.2 5
2006 5.8 7.4 9.1 5
2007 6.2 8.1 9.8 5
2008 7.2 7.7 7.9 3
2009 6.0 6.7 7.7 9.3 4 1.0 1.0 1.0
2010 6.4 7.2 9.6 3
2012 8.4 10.4 11.8 3
2013 7.5 9.3 11.4 5
2014 6.4 8.0 10.6 5
2015 4 35 88 7.7 8.0 7.9 8.7 9.9 8 1.9 1.9 1.9
2016 7.3 9.0 11.5 6
2017 6.5 8.6 9.8 4
2018 4 35 96 8.0 7.0 7 6.5 9.9 12.6 5 2.0 2.0 2.0

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
4.7 31 85 7.8 6.6 6 9.5 6.5 4.2 8.3 13 4.1 0.7 2.8 13

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1985-08-21
1989-09-15
1991-08-27
1998-08-13
2000-08-17
2009-08-11
2015-08-13
2018-08-23
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 22.8 8.8 19.3 9.2 20.9 8.6 23.8 8.4 21.8 8.8 23.3 8.3 23.8 8.7 23.7 8.7
1 19.3 9.1 20.9 8.7 23.8 8.4 21.9 8.8 23.1 8.4 23.6 8.7 23.7 8.7
2 22.9 8.8 19.3 9.1 20.9 8.7 23.7 8.5 22.9 8.4 23.2 8.7 23.7 8.6
3 19.3 9.1 20.9 8.7 23.7 8.5 21.9 8.8 22.8 8.3 23.1 8.7 23.7 8.6
4 22.7 8.8 19.3 9.2 20.9 8.7 23.7 8.5 22.8 8.3 23.0 8.7 23.7 8.6
5 19.3 9.2 20.9 8.7 23.6 8.5 21.9 8.8 22.6 8.2 22.9 8.7 23.7 8.6
6 22.2 8.8 19.2 9.3 20.9 8.7 23.7 8.5 22.4 8.1 22.8 8.6 23.7 8.6
7 22.0 8.7 18.7 9.3 20.5 8.6 23.7 8.5 21.9 8.8 21.5 7.9 22.5 8.6 23.7 8.6
8 20.9 9.3 16.3 10.6 20.2 8.6 17.7 10.6 17.5 9.8 18.0 8.5 19.2 9.9 23.6 8.6
9 17.5 10.4 12.2 11.2 19.5 8.4 14.2 10.6 15.0 9.8 14.8 8.4 15.9 10.4 16.5 11.3
10 15.0 10.8 10.2 10.0 16.9 9.0 12.6 8.9 12.9 9.4 13.2 7.9 12.4 9.8 13.9 10.9
11 9.5 8.5 12.2 8.8 11.1 8.0 11.1 8.3 12.4 7.5 10.2 9.0 11.5 9.0
12 12.0 7.1 8.5 6.6 11.5 7.0 10.3 7.2 9.8 6.8 11.2 6.9 9.3 8.6 10.3 8.1
13 8.0 5.7 10.0 6.7 10.0 7.2 9.0 6.4 10.6 6.5 8.7 8.3 9.5 7.0
14 10.8 5.4 7.8 5.1 9.0 6.2 9.5 6.7 8.8 6.6 10.3 6.0 8.1 8.1 8.9 5.9
15 7.7 4.7 9.2 5.7 9.1 6.3 8.3 6.3 10.0 5.9 7.8 7.8 8.5 5.7
16 10.0 5.0 7.4 4.5 9.2 5.7 8.8 6.1 8.2 6.2 9.8 5.7
17 7.3 4.3 9.0 4.8 8.7 6.0 9.6 5.7 7.5 7.4 8.0 4.4
18 9.5 4.2 7.3 4.1 8.8 6.0 8.2 5.6 9.4 5.6
19 7.2 3.4 8.7 5.9 9.3 5.1 7.3 7.1 7.8 3.5
20 7.1 2.8 8.9 4.3 8.5 5.8 8.2 5.2 9.2 4.8
21 7.0 2.1 8.5 5.6 9.2 4.5 7.2 6.8 7.6 2.5
22 9.0 2.3 7.0 2.1 8.9 3.6 8.4 5.4 8.2 4.8 9.1 4.1 7.6 2.1
23 7.0 1.7 8.1 4.4 9.1 3.3 7.1 6.4 7.6 1.7
24 7.0 1.5 8.1 4.0 7.5 1.5
25 7.0 0.2 8.9 3.1 7.1 5.9
26 9.0 0.7 7.5 1.3

Most recent temperature and dissolved oxygen profile plots

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