Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
WILLIMANTIC PISCATAQUIS 32 1 1.43 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
47 m
(155 ft) 		13 m
(43 ft) 		2,658 ha
(6,568 ac) 		349,488,384 m3
(283,335 ac-ft) 		414 km2
(160 mi2)

Secchi Disk Transparency Graphs

Graph Legend: Secchi symbols = average Secchi Disk Transparency Values; tick marks = maximum and minimum values for each year.

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
1984 4.5 6.2 7.5 5
1988 5.2 6.0 6.7 1
1999 5.0 9 6.3 6.3 6.3 1
2003 7.2 7.9 9.4 6
2004 5 5.8 7.4 8.7 3
2005 4 4.7 5.7 6.6 5
2006 4 6.5 6.9 7.3 3
2007 14 5.9 21 7.1 4 8.1 8.8 9.5 4
2008 4 5.3 7.4 8.5 3
2009 4.7 6.0 7.3 4
2010 6.8 7.9 8.8 4
2011 6.8 8.1 9.0 3
2012 5 6.3 6.5 7.0 3
2013 4 6.0 7.0 7.5 3
2014 6.2 6.9 7.6 3
2016 7.2 8.2 9.2 2
2017 5.2 7.0 8.2 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
14 5.5 21 7.1 9 4.3 4.5 7.1 9.5 3.4 Inf 1

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L

## Error in aggregate.data.frame(pro_melted, by = list(pro_melted$SampLocID, : no rows to aggregate
## [1] "No temperature/dissolved oxygen profile data"

Recent temperature and dissolved oxygen profile plots

Temperature (°C), Dissolved Oxygen (mg/L) 
## [1] "No DO/Temp Profile Data"