Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
GRAND LAKE STREAM PL WASHINGTON 35 1 4.7 flushes/yr
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.

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 4.0 5.0 3.5 4.6 5.5 5 1 2.3 2.3 2.3
1993 5.9 28 6.8 8.0 3 4.1 5.6 7.2 5 1.9 2.1 2.3
1997 4.1 5.1 6.7 5
1998 6.0 20 7.0 7.2 5.1 6.0 7.8 5 1.9 2.5 3.0
1999 4.3 5.2 6.2 5
2004 3.4 4.1 5.6 6
2009 7.4 22 5.9 13.6 3.1 4.1 4.8 6 1.1 1.8 2.2
2010 30 7.6 24 5.4 11.1 3.5 4.5 5.2 5 1.7 2.5 3.1
2011 29 7.4 22 6.9 9.5 3.6 4.5 5.9 7 1.4 2.2 2.5
2012 36 7.0 17 7.0 9.1 11 4.3 4.7 5.3 6 1.2 1.8 2.2
2013 48 7.2 26 7.0 9.6 3.8 4.8 5.8 6 1.1 2.4 3.3
2014 32 7.1 21 6.8 7.3 4.0 5.0 5.8 7 1.8 2.4 3.1
2015 29 7.4 21 7.0 8.3 4.3 5.2 6.0 6 1.4 3.4 10.0
2016 21 7.6 23 7.2 10.0 4.0 5.0 5.5 6 1.0 1.9 2.4
2017 27 7.4 23 7.1 8.0 4.2 5.3 6.3 6 1.6 2.5 3.4

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
32 6.8 22 6.3 8.9 7 3.1 4.9 7.8 5.7 1 2.3 10

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2016-08-02
2016-08-23
2016-09-09
2016-09-21
2017-08-03
2017-08-14
2017-09-08
2017-09-25
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 25 7.9 22 8.4 22 8.4 20 8.8 24 8.4 22 8.5 19 9.1 21 9.0
1 25 7.9 22 8.4 22 8.4 20 8.8 24 8.3 22 8.5 19 9.1 21 9.0
2 25 7.8 22 8.4 22 8.4 20 8.8 23 8.3 22 8.5 19 9.0 21 9.0
3 25 7.7 22 8.4 22 8.4 19 8.8 23 8.3 22 8.4 19 9.0 20 8.9
4 25 7.8 22 8.3 22 8.4 19 8.8 23 8.2 22 8.4 19 9.0 20 8.4
5 25 7.2 22 8.3 22 8.3 19 8.8 23 7.9 22 8.4 19 9.0 20 8.4
6 24 3.5 22 8.3 22 8.1 19 8.8 23 7.6 22 8.3 19 9.0 20 8.3
7 23 3.0 22 8.3 22 7.3 19 8.7 23 7.5 22 8.3 19 9.0 20 8.3
8 23 2.2 22 8.3 21 7.3 19 8.6 23 7.4 22 8.3 19 8.9 20 8.3
9 21 6.7

Recent temperature and dissolved oxygen profile plots

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