Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
PERRY WASHINGTON 37 1 1.18 flushes/yr 76 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
10 m
(34 ft) 		3 m
(9 ft) 		664 ha
(1,640 ac) 		18,157,461 m3
(14,720 ac-ft) 		27 km2
(10 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
1977 4 2.5 2.7 3.5 3
1984 7.0 13 2.3 4.4 6.0 5 1.8 1.8 1.8
1985 5.1 5.5 6.4 4
1986 4.2 4.6 4.9 5
1987 7.0 44 21 28 1.5 4.0 5.0 6
1988 2.8 3.6 4.6 6
1989 7.5 38 17 2.4 3.2 4.2 7 2.9 2.9 2.9
1990 2.4 3.1 4.0 7
1991 3.7 4.1 4.8 5
1992 3.8 5.3 6.4 6
1993 5.4 5.7 6.5 4
1998 5.4 6.3 7.5 5
1999 8.0 43 11 5.3 5.6 5.8 1 2.6 2.6 2.6
2002 4.5 5.7 7.1 4
2003 16 10.5 40 11 7 19 3.4 5.1 6.1 5 1 3.0 5.4 7.9
2004 4.6 5.3 6.2 5
2005 4.4 5.0 5.6 4
2006 3.1 4.3 5.4 2
2007 9 8.2 37 7.2 8 5.2 5.8 6.4 4
2008 4.8 5.2 5.8 3
2014 9.0 33 7.2 17 3.7 3.7 3.8 1 9.9 9.9 9.9

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
13 8.2 39 7.2 13 7 24 1.5 4.7 7.5 4.4 1.8 4.5 9.9

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
1987-08-20
1999-08-18
2003-08-20
2003-09-11
2007-08-20
2014-09-03
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 18 9.2 24 8.2 22 8.9 23 8.8 21 8.7 22 8.5
1 18 9.1 21 8.9 23 8.8 20 9.1 21 8.8 22 8.5
2 18 9.1 23 8.2 21 8.9 23 8.7 21 8.8 22 8.5
3 18 9.1 21 8.8 23 8.8 21 8.8 22 8.5
4 18 9.1 23 8.2 21 8.4 23 8.7 20 8.7 22 8.5
5 18 9.1 21 8.8 23 8.7 20 8.4 20 8.7 22 8.4
6 18 9.0 22 6.4 21 8.3 23 8.4 20 8.7 22 8.4
7 18 9.0 21 5.9 20 8.4 23 7.5 20 8.7 22 7.7
8 18 9.0 21 5.6 20 8.0 21 4.5 20 8.8 21 6.6
9 18 9.0 20 3.7 21 3.2 20 8.8 20 8.8 21 6.3
10 18 9.1 20 2.4

Most recent temperature and dissolved oxygen profile plots

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