Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
MOUNT VERNON KENNEBEC 20 1 5.8 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
22 m
(73 ft)
9 m
(30 ft)
40 ha
(99 ac)
3,700,000 m3
(3,000 ac-ft)
5 km2
(1.7 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
1974 8.9 3.7 4.5 5.9 6 1.8 2.7 4.7
1975 7.5 3.9 4.9 6.2 7 1.3 2.8 4.1
1976 12 59 8 12 2.9 4.5 5.9 9 1.3 2.7 6.5
1977 7 4.5 4.5 4.5 1
1982 12 68 7 32 5.9 5.9 5.9 1 2.1 2.1 2.2
1988 4.5 5.8 6.5 7 1
1990 14 55 7.2 7 6.0 6.0 6.0 1 5.9 5.9 5.9
2006 5.4 5.7 6.3 4
2007 10 13 56 7.4 6 6.4 7.0 7.8 5 1.3 1.3 1.3
2008 5.1 5.8 6.4 5
2009 4.2 4.8 5.3 5
2010 5.7 6.3 7.2 5
2011 5.0 5.7 6.3 4
2012 16 15 58 7.3 7 16 4.7 5.7 6.6 7 5.0 5.0 5.0
2013 4.6 5.2 5.7 4
2014 4.3 4.8 5.9 4
2015 4.5 4.9 5.3 2
2016 5.0 6.6 7.4 5
2017 4.6 6.1 8.2 8

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
13 13 59 7.3 7 8.2 17 2.9 5.5 8.2 4.7 1.3 3.2 6.5

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2016-08-16
2016-08-23
2016-08-31
2016-09-21
2017-08-11
2017-08-23
2017-09-14
2017-09-26
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 24.6 8.3 23.3 7.4 23.7 8.5 22.4 8.8 25.3 8.3 24.4 8.4 20.6 9.0 24.4 8.7
1 24.7 8.3 23.5 7.2 23.7 8.5 22.0 8.8 25.0 8.3 24.4 8.4 20.5 9.0 22.8 8.8
2 24.6 8.2 23.6 7.2 23.4 8.4 21.9 8.8 24.6 8.3 24.3 8.4 20.5 9.0 21.4 9.1
3 24.6 8.2 23.6 7.2 23.8 8.4 21.7 8.8 24.3 8.3 24.1 8.4 20.0 8.9 20.8 8.9
4 24.4 8.2 23.6 7.3 23.7 8.4 21.4 8.7 23.4 8.7 23.3 8.3 19.7 9.0 20.5 8.8
5 20.6 11.8 22.1 9.2 22.9 8.8 21.1 8.7 18.0 11.7 18.1 12.2 19.0 8.7 19.8 8.3
6 14.9 12.7 16.0 10.9 17.7 12.8 20.1 9.3 13.1 9.3 13.9 12.5 15.8 11.4 16.0 9.3
7 10.9 8.8 12.6 8.5 12.0 9.6 13.7 9.9 10.5 8.2 10.7 8.3 11.6 7.8 12.2 6.4
8 9.5 7.2 10.3 6.0 10.0 6.7 11.0 6.6 8.9 6.9 9.3 7.1 9.8 5.9 4.7 5.0
9 8.4 6.6 9.1 5.8 9.0 6.2 9.9 5.4 7.9 6.7 8.1 6.3 8.5 5.2 8.6 4.6
10 7.8 6.5 8.2 5.8 8.1 5.6 8.2 5.0 7.5 6.7 7.3 6.2 7.7 5.2 7.1 5.1
11 7.3 6.5 7.5 5.5 7.4 5.6 7.3 4.9 6.7 7.1 6.6 6.6 6.9 5.4 6.5 5.4
12 6.9 6.4 7.0 5.8 6.7 5.8 6.6 5.0 6.3 7.2 6.2 6.7 6.2 5.8 5.8 5.4
13 6.5 6.4 6.7 5.7 6.3 5.6 6.3 4.7 5.9 7.2 5.8 6.3 5.8 5.9 5.6 5.4
14 6.2 6.0 6.4 5.5 6.1 5.3 6.1 4.7 5.6 7.2 5.4 6.3 5.5 5.8 5.4 5.2
15 6.0 5.9 6.2 5.3 6.0 4.8 6.0 4.3 5.4 6.9 5.3 6.1 5.4 5.6 5.3 4.6
16 6.1 5.0 5.3 5.1
17 5.9 5.0 6.0 4.5 5.8 4.0 5.9 3.3 5.2 6.0 5.1 5.4 5.2 4.4 5.2 3.4
18 5.1 4.0
19 5.8 3.8 5.8 3.5 5.8 2.8 5.8 1.7 5.2 5.5 5.1 4.2 5.1 3.2 5.2 2.4
20 5.8 1.2 5.1 3.0 5.1 2.9
21 5.7 2.5 5.7 2.6 5.8 2.0 5.1 3.7 5.1 1.5 5.1 2.1
22 5.7 1.8 5.1 1.4
23 5.7 0.5 5.7 0.8

Recent temperature and dissolved oxygen profile plots

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