Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
GRAND LAKE STREAM PL WASHINGTON 35 1 4.7 flushes/yr 203 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
21 m
(70 ft) 		4 m
(12 ft) 		4,100 ha
(10,132 ac) 		152,010,404 m3
(123,237 ac-ft) 		379 km2
(146 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
1984 7 6 9 5.9 5.9 5.9 1 2.4 2.4 2.4
1998 5.1 5.1 5.1 1
2014 3.4 4.2 4.5 5
2015 5.2 5.6 6.0 4
2016 19 7 24 7.2 11 20 6.2 6.2 6.2 1 1.9 1.9 1.9

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
19 7 24 7.2 8.5 14 3.4 5.4 6.2 2.4 1.9 2.1 2.4

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1984-09-07
2016-08-10
Depth (m) TEMP DO TEMP DO
0 19 9.1 24 8.4
1 19 9.1 24 8.4
2 19 9.0 24 8.4
3 19 9.0 24 8.4
4 19 9.0 24 8.4
5 19 9.0 24 8.4
6 18 8.9 24 8.3
7 18 8.9 24 8.3
8 18 8.9 24 8.3
9 18 8.8 23 7.5
10 18 8.7 19 2.1
11 18 8.6 18 1.4
12 15 0.7 16 1.0
13 14 0.3 14 0.5
14 13 0.2 12 0.4
15 12 0.1
16
17 12 0.3
18
19 12 0.3

Most recent temperature and dissolved oxygen profile plots

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