Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
WESTON AROOSTOOK 45 1 0.58 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
39 m
(128 ft) 		10 m
(31 ft) 		6,500 ha
(16,062 ac) 		616,000,000 m3
(499,399 ac-ft) 		355 km2
(137 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 12.0 31 7.9 8.0 8.1 1 1.4 1.4 1.4
1975 14.7 24 8 8.4 8.4 8.5 2 1.8 1.8 1.8
1976 9.5 31 12 7.1 8.0 9.2 2 2.1 2.1 2.1
1983 9.0 5.0 7.6 7.6 7.6 1 1.9 1.9 1.9
1991 7.5 7.6 7.8 2
1992 6.5 7.7 9.0 6
1994 6.0 6.1 6.4 4
1995 5.6 8.5 10.7 6
1996 6.0 7.2 8.0 5
1997 5.5 7.2 8.4 4
1998 14.0 35 6 7.0 7.7 8.9 4 2.5 2.5 2.5
1999 7.3 8.2 8.6 6
2002 7.4 7.7 7.9 5
2003 10 13.5 38 3 9.1 9.1 9.1 1 1.6 1.6 1.6
2005 11.1 36 7.1 5.5 6 8.7 9.4 10.6 4 1.2 1.5 1.8
2006 8.2 8.7 9.1 4
2007 7.0 8.3 9.1 5
2008 8.2 8.5 8.7 2
2009 5 7.4 8.5 9.0 4
2011 5 7.8 8.9 10.0 4 2.4 2.4 2.4
2013 7.2 7.8 8.3 4
2014 6.8 8.1 9.2 5
2016 11 12.0 32 7.4 6 9.8 9.8 9.8 1 1.5 1.5 1.5
2017 8.2 9.6 10.2 4

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
11 12 32 7.2 6.4 6.5 5.2 6 5.5 8.2 11 3.6 1.2 1.9 2.5

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1975-09-15
1976-08-31
1983-08-10
1998-08-28
2003-08-19
2005-08-28
2011-08-24
2016-08-10
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 16 9.5 19 8.8 22 8.8 22 8.8 23 9.0 21 8.1 21 9.1 23 8.6
1 16 9.5 22 8.8 23 9.0 21 8.2 21 9.0 23 8.6
2 16 9.5 19 8.8 22 8.7 22 8.8 23 9.0 21 8.2 21 9.0 22 8.6
3 16 9.4 22 8.8 23 9.0 21 8.2 21 9.0 22 8.6
4 16 9.4 19 8.8 22 8.8 22 8.9 21 8.2 21 9.1 22 8.6
5 16 9.3 22 8.8 22 9.0 21 8.2 21 9.1 22 8.5
6 16 9.4 19 8.8 22 8.7 22 8.8 22 9.0 21 8.1 21 9.1 22 8.5
7 16 9.4 12 5.5 22 8.8 22 9.0 21 8.1 21 9.1 22 8.4
8 16 9.4 19 8.8 22 8.7 22 9.0 21 8.1 20 9.0 22 8.3
9 16 9.3 11 4.8 21 8.5 21 8.4 20 8.0 20 8.7 21 7.8
10 16 9.3 19 8.8 22 8.7 22 8.4 18 8.1 17 6.3 18 7.6 20 7.5
11 16 9.3 20 8.2 16 7.8 17 6.3 17 7.0 19 7.3
12 16 9.2 18 8.8 20 8.1 15 7.8 16 6.3 16 6.7 18 7.1
13 16 9.2 19 6.9 14 7.6 14 6.3 15 6.6 18 7.1
14 16 9.2 18 8.8 16 5.3 13 7.5 13 6.3 15 6.5 18 6.8
15 16 9.2 15 6.9 16 5.0 13 7.6 13 6.4 15 6.5 17 6.8
16 16 9.2 14 5.5 16 5.0 12 6.2
17 16 9.2 16 5.1 12 6.2 14 6.4 16 6.6
18 16 8.9 13 5.4 16 5.1 12 6.2
19 16 8.8 15 5.1 12 6.3 14 6.4 15 6.5
20 14 6.7 13 5.5 14 6.9 15 5.0 12 7.6 12 6.5
21 13 5.3 15 5.0 12 6.5 12 6.4 14 6.4
22 13 5.2 12 5.5 15 4.9 11 6.4
23 13 5.1 14 4.8 11 6.3 12 6.4 13 6.2
24 12 4.9 14 4.7 11 6.3
25 12 4.8 13 7.1 14 4.6 12 7.4 11 6.2 11 6.5 12 6.0
26 12 4.5 12 5.3 11 6.2
27 12 4.6 14 4.2 11 6.1
28 11 4.1 11 5.0 14 4.0 11 6.0
29 11 4.0 11 6.0
30 17 6.8 12 7.1 11 6.3 11 5.4
31
32
33
34
35 10 5.6 11 4.6

Recent temperature and dissolved oxygen profile plots

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