Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
HOLDEN PENOBSCOT 23 1 1.76 flushes/yr 195 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
8 m
(28 ft) 		4 m
(14 ft) 		123 ha
(304 ac) 		5,404,504 m3
(4,382 ac-ft) 		15 km2
(5.7 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 8 3.9 5.0 6.5 5
1978 9 40 11 3.6 4.4 5.5 5 3.1 3.1 3.1
1979 3.9 4.5 5.2 4
1980 3.7 4.4 5.5 4
1981 8 39 9 4.0 4.4 4.8 4 4.0 4.0 4.0
1982 4.3 4.6 4.9 5
1983 3.8 4.6 5.3 5
1984 4.0 4.1 4.3 4
1985 8 43 6 4.0 4.4 4.8 4
1986 3.5 4.1 4.6 5
1987 3.7 4.3 5.1 5
1988 3.2 4.3 5.2 5
1989 3.0 3.8 4.4 4
1990 3.7 4.0 4.5 5
1991 14 38 6.9 9 3.8 4.1 4.4 4 4.5 4.5 4.5
2000 12 49 12 4.7 4.7 4.7 1 2.9 2.9 2.9
2002 27 11 59 7 11 4.8 4.8 4.8 1 4.5 4.5 4.5
2009 4.6 4.8 5.0 4
2010 7.5 5.2 5.6 5.9 6
2011 28 10 54 7.3 7.5 4.6 5.3 6.3 5
2012 6.5 4.1 5.0 5.6 6
2013 8.7 4.5 5.1 5.9 7
2014 4.5 5.0 5.9 7
2015 4.0 4.6 5.1 7
2016 24 11 60 7.1 12 9.0 4.0 4.8 5.5 6 5.6 5.6 5.6
2017 9.0 4.4 4.6 5.0 7
2018 4.1 4.8 5.6 7

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
26 10 48 7.1 9.2 8 9.5 11 3 4.6 6.5 4.9 2.9 4.1 5.6

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1978-09-06
1981-08-26
1985-08-22
1991-09-13
2000-08-22
2002-08-15
2016-08-16
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 18 9.4 22 8.4 23 8.1 19 8.8 22 7.8 26 8.5 25 8.2
1 18 9.4 21 8.3 23 8.1 19 8.6 21 7.7 26 8.5 24 8.2
2 18 9.2 21 8.3 23 8.1 19 8.5 21 7.6 25 8.5 24 8.2
3 18 9.4 21 8.2 22 8.1 19 8.4 20 7.7 25 8.4 24 8.1
4 18 9.4 21 8.1 22 7.9 19 8.5 20 7.7 23 7.1 23 6.5
5 18 9.4 20 8.0 22 7.3 19 8.5 20 7.5 22 4.4 23 5.8
6 18 9.4 20 7.7 22 7.1 19 8.5 20 6.5 20 1.3 22 2.9
7 18 9.1 20 5.8 18 8.4 20 5.9 19 0.3 21 0.4
8 18 8.8 18 8.1 19 2.2

Most recent temperature and dissolved oxygen profile plots

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