Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
ROCKPORT KNOX 14 1 0.77 flushes/yr 123 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
10 m
(33 ft) 		6 m
(20 ft) 		137 ha
(338 ac) 		8,451,992 m3
(6,852 ac-ft) 		7 km2
(2.6 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 2018 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
1986 32
1987 24 1.2 2.4 4.2 4
1992 7 4.4 4.4 4.4 1
2015 5.9 5.9 5.9 1

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
7 28 1.2 4.2 5.9 2 Inf 1

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1986-08-15
1986-08-25
1987-08-05
1987-08-12
1987-08-19
1987-08-26
1987-09-02
1987-09-10
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 22 10.0 20 9.1 20 8.9 21 9.0 24 9.0 20 9.2 19 9.3 20 9.2
1 22 10.2 20 9.1 20 8.9 21 9.0 24 9.0 20 9.2 19 9.0 20 9.2
2 22 10.2 20 9.2 20 8.9 21 8.8 24 9.0 20 9.2 19 9.1 19 9.2
3 22 10.2 20 9.2 20 8.9 21 8.6 23 8.4 20 9.2 19 8.9 19 8.8
4 22 10.3 20 9.2 20 8.8 21 8.2 22 7.4 20 9.2 19 8.7 19 7.6
5 22 9.5 20 9.2 20 8.7 21 8.2 21 6.7 20 9.2 19 8.6 18 7.4
6 21 6.3 20 9.5 20 8.0 20 6.7 20 5.1 20 9.2 19 8.6 18 6.9
7 20 2.3 20 9.5 19 5.6 19 3.1 19 2.7 20 9.2 19 8.6 18 6.3
8 18 0.3 19 6.6 17 1.9 17 0.3 17 0.4 19 6.6 18 7.1 18 5.1
9 16 0.2 17 0.4 15 0.2 15 0.1 16 0.1 17 0.4 18 1.4 18 3.5
10 16 0.1 14 0.2 15 0.1 15 0.1 16 0.2 17 0.3 17 1.4

Most recent temperature and dissolved oxygen profile plots

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