Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
SOUTH BERWICK YORK 2 1 0.9 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
6 m
(18 ft) 		3 m
(9 ft) 		20 ha
(49 ac) 		545,139 m3
(442 ac-ft) 		1 km2
(0.3 mi2)

Secchi Disk Transparency Graphs

Graph Legend: Secchi symbols = average Secchi Disk Transparency Values; tick marks = maximum and minimum values for each year.

## [1] "No 2017 Secchi Disk Transparency Data"

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
1981 4.2 4.4 4.5 3
1982 12 59 16 3.7 3.7 3.7 1 7.1 7.1 7.1
1983 2.5 3.3 4.0 6
1991 21 41 6.7 16 3.1 3.6 4.2 6 6.5 6.5 6.5
1992 3.2 3.8 4.2 5
1993 16 18 2.7 3.4 4.0 5 1 6.5 6.7 6.9
1994 2.8 3.4 3.9 5
1995 15 3.0 3.3 3.6 3
1996 11 72 12 14 3.2 3.7 4.5 5 1 2.8 4.3 5.9
1998 3.6 3.7 3.8 2
1999 4.1 4.3 4.4 5 5
2001 15 75 7.3 8 3.8 4.1 4.6 3 1 3.7 3.7 3.7
2002 4.1 4.3 4.5 4 2
2006 3.4 4.0 4.5 5 1
2007 3.7 4.4 4.9 6 5
2008 30 13 94 7.1 15 4.2 4.2 4.2 1 5.9 6.0 6.0
2009 4.0 4.0 4.0 1
2010 13 4.1 4.1 4.1 1 4.4 4.4 4.4
2013 33 15 106 7.2 13 3.8 3.8 3.8 1 6.6 6.6 6.6

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
32 15 74 7 14 14 2.5 3.9 4.9 3.6 2.8 5.7 7.1

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1993-09-16
1996-08-01
1996-08-23
2001-08-22
2008-08-28
2009-08-18
2010-09-07
2013-09-05
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 22 7.9 26 7.6 25 8.3 25 7.2 23 7.7 28 7.3 23 7.1 24 6.1
1 22 7.8 24 7.6 25 8.2 25 7.1 23 7.8 27 7.2 23 7.1 24 6.2
2 22 7.7 23 6.8 24 8.0 25 7.1 23 7.7 25 6.6 23 7.0 24 6.1
3 21 7.1 22 4.2 23 5.7 25 6.9 22 7.0 22 1.3 22 6.3 24 2.5
4 20 2.8 21 0.2 22 0.3 24 4.2 22 2.8 18 2.1 21 1.1 21 0.2
5 20 0.2

Recent temperature and dissolved oxygen profile plots

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