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
1976 3.0 4.5 6.0 7.5 2 1.1 1.1 1.1
1977 6.0 42 3.0 3.8 2.8 6.1 8.0 3 1.4 1.4 1.4
1978 13 3.5 5.1 7.0 3
1979 4.7 42 3.2 3.2 3.2 1
1999 6.5 6.5 6.5 1
2000 5.0 5.0 5.0 1
2003 11 8.9 32 5.8 5 5.2 7.5 8.4 5
2012 5.0 5.0 5.0 1

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 6.5 39 3.9 13 5 3.8 2.8 5.6 8.4 2.1 1.1 1.2 1.4

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1977-09-29
Depth (m) TEMP DO
0 12.2 11
1
2 12.4 11
3
4 12.4 10
5
6 12.5 10
7
8 12.5 10
9
10 12.5 10
11
12 12.5 10
13
14 12.5 10
15
16 12.5 10
17
18 12.3 10
19 12.0 10
20 10.2 10
21 9.8 10
22 9.1 10
23 9.0 10
24 8.9 10
25 8.6 10
26 8.1 10
27
28 8.0 10

Recent temperature and dissolved oxygen profile plots

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