Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
BRADLEY PENOBSCOT 23 1 3.23 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
7 m
(24 ft)
3 m
(11 ft)
469 ha
(1,158 ac)
15,381,790 m3
(12,470 ac-ft)
46 km2
(18 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
1984 2.7 3.1 3.5 5
1985 7.0 37 11 3.3 3.4 3.8 5
1986 3.0 3.3 4.0 5
1987 3.0 3.5 3.8 3
1988 8.0 36 55 3.4 4.0 4.4 3
1989 3.0 3.4 3.7 1
1990 9.5 40 6.9 10 2.9 3.2 4.1 7 4.0 4.0 4.0
1991 3.4 3.6 3.8 4
1992 2.7 3.6 4.0 6
1993 3.0 3.6 4.2 6
1994 2.9 3.4 3.8 6
1995 2.5 3.7 4.1 6
2008 3.4 4.0 4.2 7
2009 10 3.4 4.0 4.3 7
2010 9 4.2 4.5 4.7 4
2011 4.4 4.7 5.5 5
2012 4.0 4.3 4.8 5
2013 3.9 4.1 4.3 5
2014 4.5 4.7 5.0 3
2015 17 10.0 49 7.1 9 4.5 4.8 5.1 3 6.2 6.2 6.2
2016 4.1 4.5 5.3 4
2017 3.8 4.5 5.0 3

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
17 8.6 40 6.9 21 9.5 2.5 3.9 5.5 4.7 4 5.1 6.2

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1985-08-22
1988-08-31
1990-08-17
2015-08-17
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO
0 23 8.4 22 8.9 26 8.60 26 8.5
1 23 8.4 25 8.60 26 8.6
2 22 8.3 22 8.8 24 8.30 25 8.4
3 22 8.2 24 8.00 24 8.1
4 22 8.0 22 8.7 24 7.70 24 7.6
5 22 7.8 24 7.60 23 6.8
6 22 7.6 22 8.6 23 6.70 23 6.0
7 23 4.70 23 4.9
8 19 0.35 22 2.6

Recent temperature and dissolved oxygen profile plots

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