Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
ST JOHN PLT AROOSTOOK 67 1 19.19 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
10 m
(33 ft) 		4 m
(11 ft) 		39 ha
(98 ac) 		2,043,700 m3
(1,657 ac-ft) 		3 km2
(1.2 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
1954
1989 51 105 7 5.5 5.8 6 2 1 1.5 1.5 1.5

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
51 105 7 5.5 5.8 6 2 1.5 1.5 1.5

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1954-08-05
1989-08-17
1989-09-07
Depth (m) TEMP DO TEMP DO TEMP DO
0 16 8.6 22 9.4 16 9.9
1 22 9.4
2 22 9.4 16 9.8
3 13 7.0 22 9.3 15 9.6
4 20 8.4
5 18 7.7 12 9.3
6 12 6.8 15 2.6 12 8.2

Recent temperature and dissolved oxygen profile plots

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