Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
GREENVILLE PISCATAQUIS 41 1 0.32 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
73 m
(240 ft) 		17 m
(55 ft) 		30,863 ha
(76,264 ac) 		5,193,000,000 m3
(4,210,034 ac-ft) 		1,032 km2
(398 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
1994 5.5 7.1 8.6 5
1995 6.8 7.5 8.6 6
1996 6.0 6.6 7.4 6
1997 7.0 7.3 8.0 5
1998 9 28 4 5.4 7.3 9.3 6 1.3 1.3 1.3
1999 6.4 8.0 8.8 4
2000 7.4 8.7 10.0 5 2
2001 8.8 9.8 10.9 5
2002 8.6 9.9 11.3 6
2003 9.2 10.3 11.6 7
2004 15 10 33 7.1 7 9.1 10.2 11.8 7 1.3 1.3 1.3
2005 7.5 8.7 10.2 7
2015 16 9 28 7.2 4 9.4 9.4 9.4 1 1.7 1.7 1.7

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
16 9.5 30 7.2 5 5.4 8.5 12 5.4 1.3 1.4 1.7

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1998-08-19
2004-08-16
2015-09-01
Depth (m) TEMP DO TEMP DO TEMP DO
0 20 8.5 21 8.8 22 8.7
1 20 8.5 21 8.8 22 8.7
2 20 8.5 21 8.8 21 8.7
3 20 8.4 21 8.8 21 8.7
4 20 8.5 21 8.8 21 8.7
5 20 8.4 21 8.9 21 8.7
6 20 8.5 21 8.8 21 8.7
7 20 8.4 20 8.8 20 8.6
8 18 8.2 20 8.7 20 8.6
9 17 8.2 20 8.7 20 8.6
10 16 7.8 19 8.5 20 8.5
11 16 8.1 18 8.5 18 7.6
12 15 8.2 17 7.4
13 14 8.1 16 7.3
14 14 7.9 15 7.6
15 13 7.9 14 7.7

Recent temperature and dissolved oxygen profile plots

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