Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
GARLAND PENOBSCOT 32 1 27.97 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
4 m
(14 ft) 		2 m
(5 ft) 		35 ha
(86 ac) 		570,233 m3
(462 ac-ft) 		11 km2
(4.2 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 28 2.1 3.0 3.8 6 1
1984 3.3 3.6 4.0 5 6
1985 3.0 4.0 4.8 5 3
1986 3.4 3.9 4.7 6 2
1987 3.0 3.6 4.5 4 1
1988 49 89 17 2.5 3.4 4.2 4 1
1989 1.7 3.4 4.3 7 2
1990 1.7 3.1 4.0 6 1
1991 52 104 8.4 17 2.5 3.5 4.5 6 2
1992 3.0 3.8 4.7 6 3
1993 2.5 3.2 3.8 6 5
1994 47 16 2.7 3.6 4.4 6 5 7.2 7.2 7.2
1995 2.5 3.5 4.2 6 4
1996 2.9 3.8 4.7 6
1997 2.9 3.8 4.4 6 4
1998 2.7 3.7 4.5 6 12
1999 2.7 3.7 4.6 6 5
2000 61 130 15 3.1 3.9 4.4 8 4 4.1 4.1 4.1
2001 3.1 3.6 4.3 8 2
2002 2.0 3.4 4.4 8 1
2003 2.9 3.6 4.3 8 5
2004 2.2 3.5 4.3 8 2
2005 11 70 150 8.2 11 2.0 3.4 4.1 8 2
2006 2.1 3.4 4.2 9 3
2007 2.8 3.4 4.1 8 5
2008 2.7 3.3 3.7 8 1
2009 10 2.7 3.6 4.2 7 5
2010 19
2011 3.4 3.9 4.6 7 7
2012 3.0 3.5 4.2 9 2
2013 2.2 3.2 4.3 8 3
2014 2.8 3.4 4.1 7
2015 10 69 155 8.5 9 2.7 3.3 3.9 8 1 6.5 6.5 6.5
2016 2.1 3.4 4.0 8 2
2017 2.8 3.7 4.2 8 4

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 58 126 8.3 17 14 1.7 3.5 4.8 6.8 4.1 5.9 7.2

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1988-09-01
1991-08-27
1994-08-16
2000-08-22
2015-08-18
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 18 10 20 9.2 22 8.0 21 8.5 28 9.4
1 18 10 20 9.3 22 8.0 21 8.3 28 9.5
2 18 10 20 9.4 22 7.9 21 8.3 26 8.6
3 20 8.8 22 7.2 20 7.6 24 3.2
4 19 0.6 20 3.9

Recent temperature and dissolved oxygen profile plots

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