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Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
T4 INDIAN PURCHASE PENOBSCOT 42 1 40.22 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
31 m
(101 ft) 		8 m
(27 ft) 		7,402 ha
(18,290 ac) 		604,626,432 m3
(490,179 ac-ft) 		439 km2
(170 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 (μS/cm), pH: pH (standard units)

TP = Total Phosphorus (μg/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 (μg/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
1981 3.5 4.5 5.5 6
1982 7 17 8 3.8 4.3 4.5 4 2.3 2.3 2.3
1983 4.0 4.3 4.8 5
1984 4.3 4.5 4.8 5
1985 4.5 4.7 4.8 2
1986 8 31 8 4.0 4.5 5.8 6
2007 4.6 4.7 4.9 2
2008 48 7 24 7 6 3.9 4.2 4.5 2
2009 3.5 4.5 5.4 4
2010 4.4 5.0 5.5 3
2011 4.1 4.5 4.9 2

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
48 7.3 24 7 8 6 3.5 4.5 5.8 3.7 2.3 2.3 2.3

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1982-08-12
1986-08-26
Depth (m) TEMP DO TEMP DO
0 21 8.7 19 7.1
1 20 8.7 19 7.1
2 20 8.5 19 6.7
3 20 8.5 19 6.3
4 20 8.5 19 6.2
5 20 8.5 19 6.1
6 20 8.3 19 5.9
7 20 8.3 19 5.6
8 20 8.2 19 5.3
9 19 4.9
10 19 4.5

Recent temperature and dissolved oxygen profile plots

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