Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
PERU OXFORD 11 1 0.7 flushes/yr 571 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
15 m
(49 ft) 		8 m
(26 ft) 		151 ha
(373 ac) 		11,801,351 m3
(9,568 ac-ft) 		14 km2
(5.5 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
1980 4.5 5.5 6.0 4
1981 5.5 6.2 6.7 3
1992 8 6.8 5.0 9 7.1 7.7 9.0 5
1993 13 6.6 7.8 5.3 7.4 8.5 6 9.9 9.9 9.9
1994 5.9 6.6 7.3 6
1995 5.0 5.0 7.2 8.6 6
1996 5.9 6.7 8.1 6
1997 6.6 7.1 7.5 5
1998 4.6 5.9 6.8 7
1999 6.5 7.6 8.3 5
2000 5.1 6.0 6.7 5
2001 5.9 7.0 8.1 5
2002 5.2 7.0 8.6 5
2003 6.5 7.4 8.1 5
2004 5.7 6.8 7.6 5
2005 4.7 6.4 7.3 6
2006 6.1 6.8 7.5 5
2007 5.4 6.9 8.2 5
2008 5.5 6.8 8.8 6
2009 4.3 5.5 6.6 7
2010 6.7 7.7 8.2 6 4
2011 4.9 6.7 7.4 5
2012 5.0 6.5 7.9 6
2013 5.1 6.5 7.6 6
2014 5.8 6.9 8.1 6

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
10 6.7 5.9 9 4.3 6.8 9 5.4 9.9 9.9 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
1992-08-19
1993-08-05
1993-09-09
1995-08-16
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO
0 21.2 8.8 24.0 8.5 22.0 8.4 24.9 8.0
1 21.2 8.8 23.9 8.5 24.3 8.1
2 23.7 8.5 24.3 8.1
3 21.0 8.8 23.7 8.5 24.2 8.1
4 22.3 8.8 24.2 8.1
5 20.8 8.8 22.9 8.9 23.3 9.0
6 20.3 8.8 19.5 10.0 18.5 12.4
7 16.6 9.0 14.8 10.7 18.5 10.3 14.9 11.4
8 14.1 8.1 12.5 10.4 14.7 9.8 12.8 9.2
9 12.2 7.0 10.7 10.3 12.0 8.3 11.5 5.6
10 10.4 4.2 9.0 6.4 10.0 4.6 10.5 1.9
11 9.2 1.3 8.2 2.5 9.0 1.2 9.7 0.0
12 8.8 0.4 7.9 0.3 8.3 0.0 9.0 0.0
13 7.8 0.2 8.0 0.0

Most recent temperature and dissolved oxygen profile plots

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