Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
DALLAS PLT FRANKLIN 29 1 3.93 flushes/yr 1747 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
4 m
(14 ft) 		2 m
(7 ft) 		145 ha
(358 ac) 		3,200,000 m3
(2,594 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.

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
1974 8.8 22 12.0 1.3 2.6 3.4 5 2.3 4.2 7.2
1975 5.2 17 7.4 2.7 3.4 4.4 6 1.5 3.5 4.6
1976 7.5 21 9.2 2.9 3.5 4.0 5 1.8 1.8 1.9
1978 4.3 4.3 4.3
1981 4.5 36 13.0 12 2.0 2.4 2.7 5 1.6 4.1 7.1
1982 8.5 30 10.6 2.1 3.3 4.7 5 1 1.2 2.9 4.6
1987 9.9 7.0 7 1.7 2.2 3.9
1990 6.7 8.6 3.4 3.8 4.2 4 2.1 3.5 6.8
1991 6.5 11.2 2.4 3.4 4.0 5 2.6 3.4 5.1
1992 5.2 6.9 10.0 2.7 3.0 3.4 5 2.6 3.5 4.6
1993 20.8 6.9 10.2 2.8 3.5 4.0 5 2.1 2.6 3.4
1994 5.0 6.7 8.2 10 3.3 3.8 4.3 5
1995 5.8 8.4 3.0 3.4 3.7 5
1996 4.7 7.0 9.4 12 2.6 3.2 3.7 5
1997 5.6 6.9 7.2 3.0 3.7 4.6 6 2 1.8 3.2 5.1
1998 6.2 6.9 9.4 2.4 3.3 4.0 5 1 2.4 4.0 5.2
1999 5.2 6.7 11.4 1.9 3.4 4.2 5 3 2.2 4.0 6.6
2000 5.2 6.7 10.7 3.3 3.5 3.8 4 1 1.7 3.1 4.4
2001 5.3 6.9 10.0 3.4 3.7 4.4 4 2 1.8 2.4 3.3
2002 5.0 6.5 9.6 3.5 3.8 4.6 5 3 3.2 3.9 5.4
2003 5.5 38 6.7 8.4 3.6 3.9 4.3 5 4 1.6 3.1 4.0
2004 5.0 6.7 11.0 8.0 3.0 3.5 3.8 4 2.6 3.2 4.0
2005 16 5.3 22 6.8 9.5 2.6 3.2 3.6 4 3.3 4.1 5.2
2006 21 5.1 27 6.9 9.8 7.0 2.7 3.1 3.8 5 1 2.8 3.8 5.1
2007 5.4 6.6 8.0 7.5 3.4 3.7 4.0 5 1 1.9 2.9 4.1
2008 6.6 8.0 7.0 3.0 3.5 4.0 3 3.2 3.7 4.4
2009 7.5 6.6 10.0 3.1 3.5 3.7 4 1 2.5 3.7 5.1
2011 2.6 2.7 2.7 1
2013 9.0 2.2 2.7 3.2 2
2014 2.0 2.8 4.6 5
2015 22 7.5 28 7.0 7.0 2.9 3.4 4.4 5 3.8 3.8 3.8
2018 2.9 3.7 4.0 2

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
20 6.5 27 6.7 9.5 8.1 9.5 11 1.3 3.3 4.7 4.5 1.2 3.4 7.2

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2004-09-04
2005-08-23
2006-08-23
2007-08-21
2009-08-03
2009-09-01
2013-08-28
2015-08-24
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 20 9.7 20 8.6 19 9.2 18 8.5 22 8.4 18 8.6 22 7.7 24 8.2
1 20 9.7 20 8.6 19 9.2 18 8.5 21 8.4 18 8.6 21 7.8 24 8.2
2 20 9.7 20 8.6 19 9.2 17 8.5 21 8.2 18 8.5 21 7.8 23 8.1
3 20 9.7 20 8.6 19 9.2 17 8.4 21 7.7 18 8.5 21 7.6 23 7.8
4 20 8.9 19 9.5 20 6.4 21 3.5

Most recent temperature and dissolved oxygen profile plots

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