Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
GRAND FALLS TOWNSHIP PENOBSCOT 34 1 39.61 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
4 m
(14 ft) 		2 m
(8 ft) 		356 ha
(879 ac) 		8,629,393 m3
(6,996 ac-ft) 		367 km2
(142 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
1982 2.2 2.5 2.5 6
2005 13 1.6 2.4 2.9 7
2006 117 9.5 32 6.9 18 1.6 1.9 2.3 9
2007 19 1.5 2.3 3.0 6
2008 24 1.8 2.0 2.4 5
2009 15 1.8 2.4 2.7 6
2010 2.1 2.4 2.8 6
2011 13 3.0 3.0 3.0 1 4.4 4.4 4.4

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
117 9.5 32 6.9 13 18 1.5 2.4 3 5.8 4.4 4.4 4.4

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2011-08-18
Depth (m) TEMP DO
0 24 8.0
1 23 8.0
2 22 7.9
3 22 7.2
4 21 6.3

Recent temperature and dissolved oxygen profile plots

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