Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
LEWISTON ANDROSCOGGIN 12 1 1.03 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
10 m
(32 ft) 		4 m
(13 ft) 		58 ha
(143 ac) 		2,306,413 m3
(1,870 ac-ft) 		4 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
1975 11 6.3 6.3 6.3 1 3.0 3.0 3.0
1976 8.0 3.5 3.5 3.5 1
1980 3.0 3.2 3.3 2
1981 11.0 94 4.3 4.3 4.3 1 3.8 3.8 3.8
1994 9.0 11.5 30 3.8 4.2 4.4 2
1995 7.7 12.2 20 4.0 4.6 5.1 4
1996 7.2 7.3 10.5 14 3.6 3.8 4.1 2
1997 9.2 7.2 11.5 10 4.3 4.3 4.4 2 3.4 4.1 4.7
1998 8.0 64 12.0 20 2.6 3.6 4.7 4 7.0 7.0 7.0
1999 8.4 6.9 12.4 12 2.8 4.5 5.8 5 3.1 5.0 9.1
2000 3.0 4.0 5.1 5
2001 8.8 7.2 12.5 44 3.6 4.9 5.6 5 3.7 4.1 4.6
2002 9.5 7.0 11.4 23 4.1 4.5 4.9 6 2.9 4.4 6.4
2003 10.7 94 6.9 11.4 41 3.8 4.7 5.7 7 3.4 5.5 6.9
2004 10.5 6.9 8.7 24 2.8 4.8 6.2 8 3.5 3.9 4.6
2005 3.0 4.1 5.9 6
2006 10.5 7.3 15.0 16 3.5 3.9 4.6 6 3.8 4.7 5.6
2007 10.0 6.7 15.0 11 3.5 4.4 5.4 5 4.2 5.0 5.7
2008 31 13.6 78 7.0 12.0 12 15 3.6 4.0 4.4 7 3.1 5.8 8.4
2009 13.0 18 3.2 3.9 4.8 3 7.4 8.0 8.5
2010 10.0 11.7 36 3.8 4.3 4.9 4 4.8 5.2 5.9
2011 9.5 93 11.0 21 4.0 4.4 4.7 5 3.4 4.2 5.2
2012 21 9.6 70 7.3 12.7 16 3.0 3.9 4.6 6 4.4 5.9 6.6
2013 10.5 10.8 17 3.6 4.7 7.2 6 3.5 5.4 7.8
2014 10.0 74 15.5 22 4.0 5.7 7.0 6 2.8 4.0 5.2
2015 10.0 80 9.5 25 4.6 6.2 7.8 6 2.4 7.2 13.0
2016 12 10.0 88 7.2 9.5 14 4.2 5.4 6.3 6 3.8 5.2 8.2
2017 9.5 102 7.1 8.5 17 4.7 5.7 6.6 5 2.9 4.4 5.7

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
21 9.7 84 7 12 12 21 2.6 4.5 7.8 4.5 2.4 5 13

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2014-09-24
2015-08-24
2015-09-23
2016-08-10
2016-09-20
2017-08-09
2017-08-29
2017-09-20
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 18 9.3 26.2 8.2 23 8.4 25 7.9 22 8.7 24.3 8.2 23.0 8.3 21.5 8.7
1 18 9.3 26.2 8.2 22 8.6 25 7.9 21 8.7 24.2 8.2 22.8 8.3 21.5 8.7
2 18 9.3 26.0 8.2 22 8.6 25 7.9 21 8.3 23.9 8.1 22.7 8.3 21.5 8.7
3 18 9.3 25.2 8.3 21 8.4 25 7.9 21 8.4 23.8 8.1 22.6 8.2 20.8 8.7
4 18 9.2 24.6 7.5 21 8.0 25 7.8 21 8.0 23.6 7.5 22.2 8.0 20.1 8.5
5 17 9.0 21.5 2.8 21 5.0 21 0.9 21 7.9 17.8 0.2 20.3 0.7 19.3 7.1
6 16 7.0 17.2 0.2 20 3.6 15 0.1 20 3.7 12.5 0.2 13.9 0.2 16.7 1.0
7 12 0.8 12.6 1.1 14 0.0 12 0.1 14 0.1 10.1 0.2 10.2 0.1 12.0 0.2
8 10 0.9 10.0 0.0 11 0.0 10 0.1 11 0.1 8.9 0.2 8.8 0.1 9.8 0.2
9 9.3 0.0 10 0.0 8.9 0.2

Recent temperature and dissolved oxygen profile plots

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