Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
UNITY WALDO 22 1 1.23 flushes/yr 175 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
12 m
(41 ft) 		6 m
(19 ft) 		1,021 ha
(2,522 ac) 		57,959,154 m3
(46,988 ac-ft) 		74 km2
(29 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
1977 13 3.70 4.0 4.3 2 3.7 3.7 3.7
1978 25 82 12 36 4.00 4.8 6.1 2 3 3.2 5.2 7.2
1981 26 51 15 70 3.00 3.4 4.0 6 6.0 6.0 6.0
1983 2.70 2.9 3.3 5 2.9 3.2 4.0
1984 1.00 1.0 1.0 1
1986 20 21 2.50 3.1 4.0 6 5.8 10.5 18.3
1987 22 65 21 1.70 2.5 3.4 5 5.0 11.4 18.6
1988 19 21 16 2.20 3.1 4.5 6 4.9 10.6 14.7
1989 29 68 27 100 1.00 2.4 3.4 6 5.4 15.4 34.3
1990 22 170 1.50 2.2 3.2 5 8.3 18.3 26.0
1991 21 22 22 1.00 2.3 4.0 7 7.2 12.8 21.7
1992 1.10 2.3 3.4 6
1993 0.90 1.8 2.6 6
1994 1.10 1.8 2.8 6
1995 1.40 2.2 2.7 5
1996 1.20 2.0 2.8 6
1997 21 64 7.5 19 70 1.10 1.8 3.1 7 40.0 40.0 40.0
1998 1.20 2.0 3.8 6
1999 1.30 2.2 4.4 6
2000 20 65 23 27 28 1.00 1.8 3.0 12 9.8 20.3 41.0
2001 21 67 7.5 22 160 41 1.00 1.9 2.6 9 9.1 18.6 29.5
2002 11 20 67 29 23 20 27 1.00 1.7 2.9 11 28.8 31.9 40.5
2003 23 22 129 19 31 1.28 1.9 2.7 6 20.0 20.0 20.0
2004 34 24 68 7.4 20 271 22 1.04 1.9 2.9 7 14.0 14.0 14.0
2005 1.23 2.1 2.8 6
2006 1.26 2.1 3.1 5
2007 18 1.18 2.0 3.3 6
2008 26 18 62 7.4 22 19 110 1.20 1.7 2.3 6 30.0 30.0 30.0
2009 21 27 33 0.90 2.0 3.0 7 5.2 24.0 37.0
2010 20 0.90 1.9 3.4 5
2011 18 22 34 0.80 1.8 2.4 6 61.0 61.0 61.0
2012 21 0.95 1.6 2.6 6
2013 15 1.34 2.5 3.8 7
2014 27 21 65 7.2 29 40 0.80 1.8 3.0 7 16.0 24.7 29.0
2015 17 22 62 7.3 21 70 0.93 2.1 3.9 7 13.0 22.4 33.0
2016 19 20 68 7.4 40 39 0.95 2.3 3.6 6 15.0 15.3 16.0
2017 32 1.15 2.1 3.0 6 17.0 17.0 17.0
2018 19 20 70 7.2 24 2.20 2.2 2.2 1 13.0 13.0 13.0

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
22 22 67 7.3 22 22 79 28 0.8 2.2 6.1 5.9 2.9 19 61

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2011-08-11
2014-09-02
2014-09-15
2015-08-11
2015-08-17
2015-09-03
2016-08-24
2016-09-13
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 23 9.3 23 7.7 20 7.7 22 6.7 27 9.2 24 8.7 24 8.7 22 7.8
1 23 9.0 23 7.6 20 7.5 23 6.6 25 9.5 24 8.6 24 8.6 22 7.7
2 23 8.9 22 6.8 19 6.9 23 6.6 24 8.2 24 6.9 23 7.7 22 7.5
3 23 8.7 22 6.3 19 6.7 23 6.6 23 6.9 24 6.7 23 7.5 22 7.4
4 23 8.6 22 5.8 19 6.7 23 6.6 24 5.9 24 6.5 23 7.5 22 7.3
5 23 8.4 22 4.8 19 6.7 23 6.5 23 5.4 23 5.0 23 7.5 22 7.0
6 22 5.4 22 4.3 19 6.7 23 6.4 22 4.7 23 2.4 23 7.4 22 7.0
7 20 0.4 21 2.3 19 6.8 22 3.0 22 3.8 22 0.4 23 6.3 22 3.7
8 19 0.2 21 0.7 19 7.0 21 0.2 22 0.8 22 0.3 22 1.8 22 3.7
9 17 0.2 20 0.4 17 7.0 20 0.2 20 0.4 21 0.3 20 0.3 21 0.6
10 16 0.2 20 0.4 19 6.7 19 0.2 20 0.3 20 0.3 18 0.2 20 0.2
11 19 0.4 18 7.0 19 0.2 19 0.3
12 19 0.4

Most recent temperature and dissolved oxygen profile plots

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