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 31
1987 20 1.1 2.5 4.5 4
2015 5.4 5.4 5.4 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
25 1.1 4 5.4 2.5 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
1986-08-08
1986-08-15
1986-08-25
1987-08-05
1987-08-12
1987-08-19
1987-08-26
1987-09-10
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 22 9.8 23 9.9 20 9.2 20 8.4 21 9.1 24 9.1 20 9.2 20 9.2
1 22 9.8 23 10.0 20 9.1 20 8.4 21 9.1 24 9.1 20 9.0 20 9.2
2 22 9.8 23 10.0 20 9.1 20 8.4 20 9.0 24 9.1 20 9.0 20 9.4
3 22 9.9 23 10.2 20 9.2 20 8.4 20 8.8 23 7.9 20 9.0 19 9.4
4 22 9.9 22 10.2 20 9.1 20 7.5 20 8.7 22 7.4 20 8.8 19 8.3
5 21 9.5 22 10.2 20 9.0 19 7.1 20 8.1 21 6.7 20 8.9 19 8.1
6 20 7.4 21 7.5 20 8.7 19 5.6 19 4.9 21 5.5 20 8.3 18 7.3
7 20 5.4 19 0.3 19 6.9 18 0.9 18 2.3 19 2.2 20 4.1 18 6.9
8 19 1.8 18 0.1 18 2.5 15 0.2 17 0.3 18 0.5 18 0.5 18 6.2
9 17 0.1 17 0.1 17 0.2 15 0.2 15 0.2 16 0.1 16 0.2 18 5.3
10 17 0.1 17 0.1 14 0.2 15 0.2 15 0.1 16 0.2 18 4.7

Most recent temperature and dissolved oxygen profile plots

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