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 8.3 8.9 9.5 2 0.9 0.9 0.9
1977 3.0 7.7 7.7 7.7 1 1.0 1.0 1.1
1978 10 6.4 6.4 6.4 1
1984 5.5 6.2 7.0 2
1990
2003 7.2 9.1 30 4.4 3.6 8.6 10.1 11.8 5 1.4 1.8 2.7
2004 14.5 8.5 32 7.1 5.0 3.5 8.3 9.1 9.9 2 1.2 1.6 1.9

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 8.8 31 7.1 4.1 10 3.4 5.5 8.1 12 2.2 0.9 1.3 2.7

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1990-09-11
2003-08-26
2003-09-26
2004-08-16
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO
0 18 8.9 20.0 8.6 16.6 9.4 20 8.9
1 18 8.9 20.0 8.6 16.4 9.5 20 8.9
2 18 8.9 20.0 8.6 16.2 9.5 20 8.8
3 18 8.9 19.8 8.6 16.1 9.5 20 8.9
4 18 8.8 19.5 8.6 16.1 9.4 20 8.9
5 18 8.8 19.2 8.6 16.1 9.4 20 8.9
6 18 8.8 19.1 8.6 16.1 9.4 20 8.9
7 18 8.8 19.0 8.7 16.1 9.4 20 8.9
8 19.0 8.7 16.0 9.4 20 8.9
9 18 8.8 19.0 8.7 16.0 9.4 20 8.9
10 18 8.8 19.0 8.7 16.0 9.4 19 8.8
11 17.3 8.8 15.8 9.3 18 8.8
12 17 8.6 15.5 9.0 15.2 9.3 17 8.7
13 16 8.5 12.9 9.4 14.9 9.2 16 8.7
14 15 8.4 11.2 9.6 14.6 9.2 15 8.7
15 15 8.4 11.0 9.6 14.0 9.1 15 8.7
16 10.5 9.6 13.0 9.1 14 8.7
17 13 8.4 10.5 9.6 12.9 9.0 14 8.8
18 12.4 9.1 14 8.8
19 12 8.4 12.0 9.1 14 8.8
20 10.2 9.7 11.9 9.1 14 8.9
21 13 9.0
22 12 8.4 13 9.0
23 11.2 9.1 13 9.1
24 13 9.1
25 11 8.6 9.9 9.8 11.0 9.2 13 9.1
26
27
28
29
30 10 8.8 9.5 9.8 10.5 9.2 12 9.3
31
32
33
34
35 10 8.6 9.1 9.8 10.1 9.3 12 9.5
36
37
38
39
40 10 8.6 8.8 9.7 9.9 9.2 11 9.0

Recent temperature and dissolved oxygen profile plots

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