Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
BOWDOIN COL GR WEST PISCATAQUIS 41 1 1.92 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
20 m
(64 ft) 		4 m
(14 ft) 		380 ha
(939 ac) 		16,100,000 m3
(13,052 ac-ft) 		41 km2
(16 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
1974 10.5 22 3.7 3.7 3.7 1 2.7 2.7 2.7
1975 11.7 21 12 3.2 3.4 3.7 2 3.4 3.4 3.4
1976 11.5 32 9 3.0 3.0 3.0 1 3.5 3.5 3.5
1996 7.0 28 19 18 4.1 4.1 4.1 1 3.4 3.4 3.4
2003 3.5 4.6 6.5 5
2004 2.7 3.9 5.3 4
2005 20 8.6 27 7.2 8 15 2.8 3.8 5.5 5 10.0 10.0 10.0
2006 8 2.9 4.4 5.5 5
2007 3.5 4.1 5.2 5
2008 3.1 3.9 5.4 4
2009 13 12 2.9 4.1 5.8 4 3.8 3.8 3.8
2010 3.6 4.4 5.8 3
2011 3.4 3.7 4.2 4
2012 2.8 3.9 5.1 5
2013 3.8 4.2 4.5 1
2014 3.4 4.0 4.3 5
2015 3.4 4.1 5.2 3
2016 13 10.0 29 7.1 8 3.4 4.3 5.1 4 3.3 3.3 3.3

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
16 9.9 27 7.1 11 10 15 2.7 4 6.5 3.4 2.7 4.3 10

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1974-08-14
1975-09-10
1976-08-23
1996-08-14
2005-08-25
2009-08-20
2016-08-10
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 22.6 8.5 15.3 9.7 21.0 8.6 20.9 8.3 20.0 8.2 25.4 8.0 22.9 8.3
1 15.3 9.5 21.0 8.6 20.9 8.4 20.2 8.2 25.2 8.0 22.6 8.2
2 22.5 8.5 15.3 9.6 21.0 8.6 20.9 8.4 20.2 7.9 24.4 8.1 22.6 8.2
3 22.3 8.6 15.3 9.5 20.0 8.5 20.9 8.4 20.2 7.9 22.7 8.2 22.3 8.1
4 15.3 9.5 18.5 7.6 19.0 6.3 20.2 7.9 20.6 6.8 22.2 8.1
5 19.4 6.8 15.2 9.4 17.5 6.5 17.2 5.2 20.2 7.7 19.7 5.7 22.0 8.0
6 16.8 4.3 15.2 9.4 16.0 4.4 16.1 4.9 18.5 5.0 18.4 3.9 21.5 5.9
7 15.2 9.3 13.8 2.6 15.6 4.5 14.2 2.9 17.0 3.0 16.5 2.3
8 12.2 3.3 15.2 9.4 12.5 2.2 14.3 4.1 11.4 2.7 15.9 2.0 14.5 2.0
9 10.2 3.8 14.2 8.6 11.8 2.0 13.1 4.0 10.6 2.9 15.0 2.1 12.5 2.9
10 10.5 3.5 11.0 2.0 11.0 4.2 10.3 3.1 13.7 2.3 11.3 3.5
11 9.9 4.0 9.3 1.6 10.0 2.1 9.8 4.3 10.0 3.0 12.5 2.2 10.5 3.4
12 9.1 3.7 8.0 1.8 9.2 1.7 9.0 4.1 9.8 2.8 11.4 1.9 9.9 3.0
13 7.0 1.5 9.1 1.6 8.7 3.8 9.8 2.5 10.5 1.2 9.6 2.6
14 9.0 3.3 7.0 1.2 8.3 3.4 9.6 2.2 10.0 0.7 9.4 2.2
15 8.9 2.8 6.6 1.1 9.0 1.4 8.2 3.3 9.5 2.0 9.7 0.5 9.3 1.8
16 6.5 0.8 9.0 1.2 8.2 3.2 9.5 1.5 9.6 0.4 9.2 1.7
17 8.9 2.7 6.4 0.7 9.0 1.0 8.2 3.0 9.5 0.4 9.2 1.5
18 8.9 2.6 6.4 0.4 8.1 2.9 9.5 0.4 9.1 1.1
19 8.9 1.6 6.2 0.3 8.1 2.8

Recent temperature and dissolved oxygen profile plots

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