Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
NORTHFIELD WASHINGTON 26 1 1.16 flushes/yr 172 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
5 m
(16 ft) 		2 m
(8 ft) 		46 ha
(114 ac) 		1,088,691 m3
(883 ac-ft) 		1 km2
(0.6 mi2)

Secchi Disk Transparency Graphs

Graph Legend: Secchi symbols = average Secchi Disk Transparency Values; tick marks = maximum and minimum values for each year.

## [1] "No 2018 Secchi Disk Transparency Data"

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
1990 9.5 17 6.6 10 3.0 4.0 4.6 7 1
2005 2.0 16 6.5 7 4.2 4.2 4.2 1 1 1.6 1.6 1.6
2014 3.0 16 5 4.7 4.7 4.7 1 1 1.7 1.7 1.7
2015 7 4.0 17 7.2 6 4.2 4.2 4.2 1 1 1.2 1.2 1.2

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
7 4.6 16 6.7 7 3 4.3 4.7 2.5 1.2 1.5 1.7

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1990-09-06
2005-08-25
2014-08-18
2015-08-11
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO
0 21 8.2 22 9.1 22 8.7 24 8.6
1 21 7.9 22 9.2 22 8.7 24 8.6
2 21 8.0 22 9.2 22 8.7 24 8.6
3 21 8.0 22 9.3 22 8.7 24 8.6
4 22 9.5 22 8.7

Most recent temperature and dissolved oxygen profile plots

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