Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
NORTHPORT WALDO 14 1 2.4 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
12 m
(38 ft) 		4 m
(13 ft) 		146 ha
(361 ac) 		5,757,304 m3
(4,668 ac-ft) 		18 km2
(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
1981 3.3 3.8 3.9 5
1982 5.0 35 8 3.8 4.9 8.5 6 2.2 2.2 2.2
1983 2.7 4.0 5.2 6
1984 3.1 4.1 5.5 5
1985 5.0 25 8 3.0 3.9 4.7 6
1986 3.2 4.2 5.5 6
1987 2.7 3.5 4.5 6
1988 5.0 9 2.4 3.5 5.4 6
1989 2.3 3.2 4.0 6
1990 9.0 27 6.8 8 3.0 5.3 9.0 9
1991 7.0 28 6.7 20 2.7 4.6 9.0 8
1992 3.8 4.7 5.6 6
1993 5.0 5.0 5.0 1
1994 3.7 4.9 6.3 3
1996 3.5 4.8 6.3 5
1997 7.0 32 6.9 9 4.8 5.8 7.4 4 2.4 2.4 2.4
1998 4.6 4.8 5.2 3
1999 3.6 5.2 6.1 3
2000 4.7 5.5 7.0 4
2001 5.3 6.0 6.7 6
2002 43 7.5 37 8 7.5 4.1 5.4 7.2 7 6.8 6.8 6.8
2003 4.7 5.5 7.3 5
2004 4.5 5.0 5.8 5
2005 4.8 5.3 6.0 3
2006 3.8 4.5 5.7 3
2007 18 4.5 31 6.6 8 4.8 5.1 6.2 6 3.6 3.6 3.6
2008 4.9 5.4 5.9 5
2009 4.0 4.5 6.4 6
2010 4.7 5.1 5.5 5
2011 4.6 5.1 5.5 5
2012 19 6.7 39 7.0 9 17.0 3.0 4.3 5.6 7 2.6 2.6 2.6
2013 3.8 4.4 5.6 5
2014 3.8 4.8 6.1 6
2015 4.2 4.7 5.0 5
2016 4.2 5.1 5.8 4
2017 4.2 5.0 5.9 6

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
27 6.3 32 6.8 9.7 12 2.3 4.7 9 5.2 2.2 3.5 6.8

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1982-08-30
1985-08-29
1988-09-02
1990-09-13
1997-08-14
2002-08-19
2007-08-15
2012-08-30
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 19 8.7 21 8.0 19 9.1 21 8.1 24 7.8 28 8.1 23 7.7 24 6.7
1 19 8.7 21 8.0 23 7.8 27 8.1 23 7.7 24 6.6
2 19 8.7 21 7.9 19 8.8 21 8.0 23 7.8 27 8.1 23 7.7 23 6.8
3 19 8.7 21 8.0 23 7.8 26 8.1 23 7.6 23 6.6
4 19 8.6 21 7.8 19 8.6 21 7.9 23 7.8 24 5.5 23 7.5 23 6.6
5 19 8.6 21 7.8 23 7.7 23 3.9 23 6.5 23 6.6
6 19 8.6 21 7.9 18 8.2 20 7.8 23 7.7 23 3.4 22 5.6 23 6.4
7 19 8.6 21 7.8 18 7.3 20 7.8 23 7.7 23 3.1 22 5.2 23 1.5
8 19 8.6 21 7.8 18 6.8 20 7.6 23 7.6 22 2.7 22 5.1 22 0.3
9 19 8.6 21 7.6 20 7.2 23 7.6 22 2.5 22 5.1 20 0.1
10 18 8.6 21 7.6 20 7.0 19 7.6 18 0.4 22 4.9 17 0.1
11 21 7.4 20 6.5 16 0.2 17 0.2 22 4.7
12 20 5.6 20 6.2

Recent temperature and dissolved oxygen profile plots

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