Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
NORTH BERWICK YORK 2 1 8.77 flushes/yr 205 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
9 m
(29 ft) 		3 m
(10 ft) 		76 ha
(188 ac) 		2,416,279 m3
(1,959 ac-ft) 		38 km2
(15 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 12 2.7 2.8 2.8 2 3.2 3.5 3.8
1976 18 3.5 3.5 3.5 1 4.0 4.0 4.0
1977 14 2.7 2.8 2.8 2
1978 3.7 4.3 5.0 2
1979 9.0 77 16 13 1.2 1.9 2.7 2 5.2 5.2 5.2
1980 10.0 70 16 70 2.4 3.2 4.0 6 1.8 4.1 8.2
1982 2.0 2.2 2.4 2
1984 8.0 19 67 2.3 2.5 2.9 3 5.9 5.9 5.9
1986 11.5 73 26 2.3 3.2 3.7 3 2.4 8.8 17.8
1987 10.0 83 13 57 2.3 2.3 2.3 1
1988 1.8 2.5 3.0 3
1992 11.5 48 7.1 15 2.3 3.2 4.8 5 3.0 3.0 3.0
1993 2.5 3.5 5.0 5
1994 2.5 3.7 5.1 6
1995 3.1 3.9 4.5 4
1996 2.3 2.4 2.8 2
1997 2.6 3.1 3.7 2
1998 11.2 94 15 19 2.2 2.4 2.6 1 8.9 8.9 8.9
2006 7.4 97 20 2.1 2.3 2.6 4 2.9 4.9 9.0
2007 54 8.1 122 7.0 16 81 2.3 3.0 3.8 4 1.9 5.5 8.5
2008 7.0 106 5.7 19 1.7 2.8 3.4 7 5.3 6.8 8.0
2009 7.7 19 1.8 2.4 3.0 10 3.9 5.5 7.9
2010 11.0 7.0 25 2.6 3.4 4.8 7 3.0 3.9 5.2
2011 10.3 20 2.8 3.4 3.8 6 4.5 4.9 5.4
2012 53 10.4 128 7.0 16 48 2.3 2.6 2.9 9 5.0 7.1 9.8
2013 83 8.3 6.9 28 1.6 2.3 3.5 8 4.0 7.9 12.0
2014 20 16 2.0 2.4 2.9 4 4.3 4.3 4.3
2015 19 13 2.5 3.3 4.2 7 5.3 5.3 5.3
2016 21 9 3.4 4.2 5.1 5 3.0 3.0 3.0
2017 22 56 2.0 3.0 4.7 6 8.1 8.1 8.1
2018 34 11.5 193 6.9 16 35 4.9 4.9 4.9 1 3.0 3.5 4.0

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
56 9.6 99 6.4 18 21 49 26 1.2 3 5.1 4.2 1.8 5.4 18

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2013-08-21
2013-09-13
2014-08-24
2015-08-20
2016-08-19
2017-08-07
2017-09-05
2018-08-27
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 24.4 8.5 22 8.0 23 7.6 27.5 7.6 26 8.6 24.3 7.6 21.6 8.3 25.3 8.0
1 23.7 8.4 22 7.9 22 7.4 27.5 7.1 26 8.5 23.9 7.5 21.6 8.4 24.8 8.0
2 22.4 6.9 21 6.7 21 7.0 27.5 7.7 26 8.3 23.7 7.4 19.9 7.8 24.4 8.0
3 21.1 4.2 20 6.1 20 1.7 23.1 5.3 26 8.0 23.4 7.1 19.6 7.5 24.0 7.6
4 17.2 0.2 19 4.0 18 0.1 19.5 0.2 24 4.3 23.4 7.1 19.0 7.1 21.6 2.3
5 13.9 0.1 15 0.1 16 0.0 13.9 0.1 19 0.3 18.4 0.5 17.5 3.1 14.9 2.8
6 11.9 0.1 12 0.1 12 0.0 11.9 0.1 15 0.1 14.9 0.1 11.9 0.3 11.0 0.7
7 10.3 0.1 11 0.1 11 0.0 10.0 0.1 12 0.1 11.0 0.1 10.0 0.2 9.0 0.6
8 9.5 0.1 10 0.1 10 0.0 9.4 0.1 11 0.1 9.4 0.1 9.5 0.2 8.2 0.5

Most recent temperature and dissolved oxygen profile plots

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