Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
MONMOUTH KENNEBEC 12 1 3.67 flushes/yr 166 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
12 m
(40 ft) 		5 m
(17 ft) 		563 ha
(1,391 ac) 		29,470,000 m3
(23,892 ac-ft) 		43 km2
(17 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 18 48 40 22 1.4 3.0 4.8 8 5.4 5.4 5.4
1976 55 1.0 2.7 4.3 8 4.5 8.9 20.5
1977 10 66 96 1.0 2.2 3.5 9 3.6 16.5 58.3
1978 30 28 94 48 0.8 2.8 4.6 9 5.8 17.1 41.8
1979 90 18 39 2.0 3.8 5.0 11 3.1 9.3 98.9
1980 20 18 16 46 1.8 3.4 4.8 10 4.2 9.5 24.1
1981 46 1.2 3.3 6.1 10 2.9 14.1 42.9
1982 25 42 1.0 3.1 4.8 8 2.4 14.0 43.8
1983 73 0.4 2.8 4.6 11 4.8 15.0 70.5
1984 54 60 1.1 3.0 4.4 9 5.2 17.4 53.2
1985 74 80 0.9 2.9 5.2 7 5.6 25.4 49.3
1986 16 43 1.2 3.2 4.4 7 3.7 15.4 38.2
1987 13 63 0.6 2.9 4.2 7 4.3 18.5 34.0
1988 14 31 0.7 2.8 4.7 7 1.2 10.8 22.7
1989 3.0 4.0 5.4 6 2.9 8.9 13.2
1990 17 7.0 60 0.8 3.0 4.7 7 2.7 12.8 47.3
1991 17 7.0 34 1.0 3.5 5.6 7 3.5 9.6 44.5
1992 17 7.1 1.4 3.3 5.3 7 4.2 16.3 23.2
1993 17 7.0 70 1.3 3.3 5.8 7 9.4 20.0 40.9
1994 16 6.9 41 1.5 3.3 4.9 6 4.6 11.6 25.6
1995 14 6.9 35 1.8 3.7 5.5 8
1996 45 1.3 3.1 4.9 6 5.3 9.4 14.6
1997 18 6.9 31 11 34 1.0 3.3 5.4 11 3.2 17.6 63.3
1998 48 2.2 4.0 5.3 9 3.8 11.9 20.4
1999 53 1.4 3.6 5.3 6 5.3 13.6 36.4
2000 16 7.0 31 2.6 4.0 4.9 6 5.2 8.7 14.8
2001 15 7.0 18 49 1.6 4.2 6.9 6 3.1 10.2 26.3
2002 16 7.0 33 2.7 4.9 6.1 6 4.0 7.6 14.7
2003 10 17 7.0 52 2.3 4.5 6.5 9 3.8 6.8 14.9
2004 15 7.0 53 1.7 4.5 6.5 6 3.8 10.2 30.4
2005 12 7.0 40 3.6 4.8 6.6 6 3.9 5.8 7.8
2006 11 18 83 7.0 46 2.6 4.3 5.9 7 2.0 7.8 13.0
2007 19 7.1 49 2.1 4.4 6.9 6 2.6 5.9 15.0
2008 13 19 80 7.0 20 196 41 2.2 4.3 6.3 10 1.7 7.1 15.0
2009 20 33 1.9 3.4 5.6 8 7.0 12.6 22.0
2010 20 16 51 1.4 3.8 5.8 9 4.0 12.6 31.0
2011 18 140 25 1.9 4.3 6.9 6 3.9 8.9 21.0
2012 20 35 1.4 4.0 6.3 12 3.3 10.7 23.0
2013 21 19 25 54 2.5 3.6 4.7 9 4.5 9.0 13.0
2014 20 17 61 57 2.4 3.9 6.2 12 6.1 11.7 17.0
2015 20 14 38 62 2.5 3.8 6.5 10 2.9 11.2 17.0
2016 22 16 96 61 2.7 4.6 7.1 11 2.3 6.6 16.0
2017 20 15 20 57 1.8 3.8 6.2 11 3.6 8.3 13.0
2018 6 20 100 8.4 16 19 65 1.9 4.8 7.0 11 3.0 9.5 20.0

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
10 17 72 7 23 37 62 49 0.4 3.6 7.1 8.2 1.2 12 99

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2016-09-14
2017-08-15
2017-08-30
2017-09-12
2018-08-01
2018-08-14
2018-08-29
2018-09-12
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 22 8.5 24 8.8 22 9.0 20 9.8 26.4 8.6 26 8.8 26 9.3 22 7.7
1 22 8.4 24 8.6 22 8.9 20 9.9 26.4 8.6 26 8.9 26 9.4 22 7.7
2 22 8.2 24 8.8 22 8.9 20 9.4 26.3 8.7 26 8.9 25 9.6 22 7.6
3 22 8.2 24 8.8 22 8.9 20 8.9 26.0 8.8 26 8.9 25 9.3 22 7.5
4 22 8.1 24 8.5 22 8.9 20 8.8 25.7 8.7 26 8.8 24 8.1 22 7.5
5 22 8.1 24 8.6 22 8.6 19 8.5 24.6 8.0 26 8.7 23 7.2 22 7.5
6 22 8.0 23 4.5 22 8.4 19 7.9 23.4 5.3 23 1.7 23 5.4 22 7.4
7 22 7.7 19 0.7 21 2.7 19 7.5 20.4 0.9 20 0.2 21 2.0 22 7.0
8 21 0.8 16 0.1 18 0.1 19 6.5 14.9 0.4 17 0.2 18 0.3 20 3.7
9 16 0.4 14 0.1 14 0.1 17 0.2 13.4 0.4 14 0.3 14 0.4 14 0.4
10 14 0.4 13 0.1 13 0.1 13 0.2 12.5 0.4 11 0.3 12 0.5 12 0.3
11 13 0.4 12 0.2 12 0.1 12 0.2 11.1 0.4 11 0.3 11 0.6 11 0.3
12 13 0.4 12 0.2 12 0.1 12 0.2 10.1 0.4 10 0.4 10 0.6 11 0.3
13 12 0.2 12 0.1 12 0.1 9.8 0.5 10 0.4 10 0.6 10 0.3

Most recent temperature and dissolved oxygen profile plots

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