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.

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 4.0 35 10.0 21.0 3.4 6.2 7.3 5 2.7 2.7 2.7
1981 8.0 27 6.0 14.0 4.9 6.7 8.0 5 1.7 2.4 3.6
1992 7.0 6.1 4.0 10.0 6.8 7.4 7.9 5
1993 7.5 6.3 7.9 10.5 5.8 7.2 8.0 6 1.7 2.2 2.6
1994 7.0 8.0 15.0 5.8 6.5 7.1 6 3.8 3.8 3.8
1995 5.0 6.7 7.8 14.3 5.6 6.9 8.0 6
1996 5.3 6.2 7.5 6
1997 5.1 7.0 5.8 10.2 5.7 6.8 7.6 5 3.2 3.6 4.2
1998 3.9 5.6 6.6 8
1999 5.5 6.8 6.2 7.5 6.0 7.1 8.0 5 1.5 2.7 4.0
2000 5.0 6.0 6.7 5
2001 5.7 6.8 7.9 5
2002 4.9 6.8 8.1 5
2003 6.0 7.0 7.7 5
2004 8 8.0 28 6.9 4.0 10.0 6.1 6.9 8.0 5 3.0 3.0 3.0
2005 5.0 15 6.7 6.0 18.0 5.5 6.5 7.4 6 4.3 4.3 4.3
2006 5.0 7.1 5.0 14.0 5.7 6.6 7.4 5 3.6 3.6 3.6
2007 5.0 6.7 5.0 18.0 5.7 6.8 8.1 5 3.0 3.0 3.0
2008 6.5 7.0 11.0 11.0 6.1 6.7 8.7 7 5.4 5.4 5.4
2009 5.0 7.0 10.5 11.0 4.3 5.6 6.7 8 4.6 4.7 4.8
2010 4.0 10.0 6.4 7.4 7.9 7 4 1.6 1.7 1.8
2011 6.0 8.5 8.0 5.0 6.6 7.6 5 1.6 2.0 2.4
2012 11 4.7 24 6.9 4.0 10.0 4.3 6.4 7.7 6 2.6 3.2 3.8
2013 6.0 4.5 8.0 5.0 6.5 7.9 7
2014 4.5 27 5.0 7.0 5.6 6.8 7.4 6 3.1 3.1 3.1
2015 5.5 29 4.0 7.5 6.3 7.7 8.5 7 2.5 2.8 3.1
2016 5.5 33 6.9 5.0 9.0 8.1 8.5 8.9 5 3.1 3.1 3.1
2017 4.0 44 7.1 4.0 15.0 6.5 8.3 9.6 5 1.9 1.9 1.9
2018 11 4.0 8.0 6.2 7.8 8.7 5 2.0 2.0 2.0

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 5.7 29 6.7 6.1 12 3.4 6.8 9.6 5.7 1.5 3.1 5.4

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2011-08-24
2012-08-15
2013-08-15
2014-08-12
2015-08-21
2016-08-15
2017-08-16
2018-08-03
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 23.0 8.5 25.3 8.2 22.1 8.6 24.7 8.4 25.5 8.2 24.6 8.3 23.7 8.4 26.2 8.2
1 23.0 8.5 25.2 8.3 22.1 8.6 24.5 8.5 25.5 8.2 24.6 8.3 23.7 8.4 26.0 8.2
2 23.0 8.5 25.2 8.3 22.1 8.6 24.2 8.5 25.5 8.2 24.5 8.3 23.7 8.4 25.8 8.2
3 23.0 8.5 25.1 8.3 22.0 8.6 23.9 8.6 25.5 8.2 24.4 8.3 23.7 8.4 25.8 8.2
4 22.9 8.5 24.6 8.3 22.0 8.6 23.2 8.8 25.2 8.4 24.3 8.2 23.7 8.4 25.6 8.2
5 22.6 8.4 22.0 8.8 17.2 8.6 21.4 9.8 23.0 9.2 24.2 8.2 23.6 8.5 24.7 8.1
6 18.3 9.9 16.2 7.5 15.0 7.9 15.7 10.8 18.6 12.8 23.0 9.5 18.7 12.1 17.9 8.9
7 14.5 7.7 13.4 6.3 11.8 6.6 11.7 8.3 14.7 10.3 17.6 12.5 14.3 11.9 13.5 8.9
8 11.8 6.1 11.8 4.4 10.3 5.5 9.8 6.6 11.6 7.6 13.6 10.3 10.7 6.5 10.5 7.6
9 10.2 5.3 10.7 4.0 9.4 5.0 8.6 6.2 9.8 6.0 10.8 8.0 9.4 5.7 8.8 7.1
10 9.0 4.4 10.1 3.8 8.5 5.1 7.7 5.3 8.7 5.5 9.3 4.4 8.4 3.6 7.9 6.8
11 8.1 3.4 9.4 2.8 7.8 4.5 6.9 4.2 8.1 3.7 8.5 3.8 7.7 2.2 7.3 5.2
12 7.6 2.2 8.8 1.7 7.4 2.8 6.5 2.9 7.8 3.2 7.9 1.8 7.2 1.0 6.8 4.0
13 7.2 1.0 8.4 0.4 7.1 1.5 6.3 0.6 7.5 1.4 7.5 0.1 6.7 0.1 6.4 2.9
14 6.8 0.0 7.9 0.2 7.0 0.1 6.2 0.1 7.0 0.5 7.0 0.1 6.5 0.1 6.0 0.3
15 6.3 0.1

Most recent temperature and dissolved oxygen profile plots

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