Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
ROCKPORT KNOX 14 1 1.2 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
7 m
(24 ft) 		3 m
(11 ft) 		12 ha
(30 ac) 		404,312 m3
(328 ac-ft) 		1 km2
(0.3 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
1979 154 556 1.6 2.1 2.7 3 17.1 24.7 28.7
1983 145 57 500 1.4 3.5 5.5 5 20.6 20.6 20.6
1984 131 33 100 1.4 2.8 5.0 3 18.4 18.4 18.4
1987 176 580 40 2.0 3.3 4.8 4 14.2 14.2 14.2
1993 39 39 2.0 2.0 2.0 1 30.4 30.4 30.4
1994 190 7.4 59 1.9 1.9 1.9 1
1998 133 320 20 290 3.3 3.6 3.8 1 8.1 8.1 8.1
2003 10 130 350 29 148 4.5 4.5 4.5 1 26.0 26.0 26.0
2004 14 119 388 20 35 38 3.6 4.3 5.0 4 1.7 4.2 8.3
2005 24 21 3.8 5.3 6.0 4 4.2 6.0 7.9
2008 16 114 328 8.1 15 38 5.2 5.2 5.2 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
13 144 420 7.6 30 185 39 1.4 3.5 6 2.5 1.7 16 30

Most recent late summer temperature and dissolved oxygen profiles

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

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Recent temperature and dissolved oxygen profile plots

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