Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
NORTHFIELD WASHINGTON 26 1 0.63 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
14 m
(46 ft) 		4 m
(14 ft) 		328 ha
(810 ac) 		14,542,302 m3
(11,790 ac-ft) 		8 km2
(3.2 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
1977 12 4.0 4.0 4.0 1
1978 25 9 4.0 4.0 4.0 3
1989 3.0 21 8 4.9 4.9 4.9 1 2.9 2.9 2.9
1997 6.0 22 6.5 7 9.0 5.0 5.8 6.4 1 3.9 3.9 3.9
2004 4 5.3 6.0 7.7 3
2005 12 13.2 21 6.6 7 6 9.5 5.0 6.0 6.7 6 4.5 4.5 4.5
2006 4.1 5.6 6.9 7
2007 4.1 6.4 7.1 6
2008 4.8 5.5 6.4 5
2009 4.8 5.4 6.3 5
2010 5.9 6.3 6.8 5
2011 1 2.8 20 6.6 7 4.5 5.6 6.6 4
2012 4.9 6.2 7.2 7
2013 5.6 6.0 6.3 2
2014 3.5 20 6 10.0 5.2 5.7 6.3 4 2.8 2.8 2.8
2015 4.4 5.6 7.3 7
2016 20 4.2 21 6.6 7 23.0 5.2 6.0 6.5 8 3.2 3.2 3.2
2017 5.8 6.4 7.3 5

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
11 5.5 21 6.6 7.8 6.5 13 4 5.6 7.7 4.4 2.8 3.5 4.5

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2016-08-15
2016-08-24
2016-08-28
2016-09-27
2016-09-28
2017-08-13
2017-08-18
2017-08-24
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 24 8.3 22 8.1 23 8.2 18 8.8 18 9.2 23 8.1 22 8.0 23 8.2
1 24 8.3 22 8.0 23 8.2 18 8.7 18 9.2 23 8.1 22 8.0 23 8.2
2 23 8.3 22 8.0 23 8.2 18 8.7 18 9.1 23 8.1 22 8.0 23 8.2
3 23 8.2 22 8.0 23 8.2 18 8.7 18 9.0 23 8.1 22 7.9 22 8.2
4 23 8.2 22 8.0 23 8.1 18 8.7 17 9.0 23 8.1 22 7.9 22 8.1
5 23 8.0 22 8.0 23 8.1 17 8.6 17 9.1 22 7.9 22 7.9 22 7.9
6 23 8.0 22 7.7 23 7.6 17 8.6 17 9.1 22 7.9 22 7.9 22 7.4
7 21 4.0 22 7.1 22 6.6 17 8.5 17 9.0 22 6.4 22 7.9 21 7.1
8 18 1.5 21 6.1 21 4.6 17 8.5 17 8.9 19 0.4 21 5.4 21 6.4
9 16 0.8 16 0.1 17 0.0 17 8.5 17 9.0 16 0.1 18 0.0 17 0.1
10 15 0.5 14 0.1 15 0.0 16 7.9 17 8.7 14 0.1 14 0.0 14 0.1
11 14 0.4 14 0.0 14 0.0 16 7.1 16 7.9 14 0.1 14 0.0 14 0.1
12 13 0.4 13 0.0 13 0.0 15 4.3 16 0.0 13 0.1 13 0.0 13 0.1
13 12 0.4 12 0.0 12 0.0 12 0.2 16 0.0 13 0.1 13 0.0
14 12 0.0 16 0.0 12 0.0
15 12 0.0 16 0.0 12 0.0

Recent temperature and dissolved oxygen profile plots

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