Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
SMITHFIELD SOMERSET 20 1 0.25 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
8 m
(27 ft) 		5 m
(16 ft) 		698 ha
(1,724 ac) 		33,682,695 m3
(27,307 ac-ft) 		11 km2
(4.3 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
1980 7 30 5.0 5.0 5.0 1 3.0 3.0 3.0
1999 15
2004 4 8 45 19 16 2.1 3.5 4.4 5 6.1 6.1 6.1
2005 40 18 15 0.7 3.2 5.1 6 4.5 27.6 88.0
2006 18 1.6 3.2 6.2 6 4.2 11.9 22.0
2007 18 1.4 4.2 6.2 7 3 1.9 4.8 14.0
2008 2.1 3.8 6.4 6 1
2009 16 1.3 4.1 6.0 5 2.0 7.6 40.0
2010 24 0.6 2.3 4.3 7 3.1 17.0 59.0
2011 15 2.3 4.6 7.0 7 2 1.7 7.6 14.9
2012 19 0.7 3.2 5.8 6 1.0 19.0 91.0
2014 1.4 3.0 6.5 7
2015 2.5 3.7 4.9 7
2016 2.0 4.1 6.8 7 1
2017 2.1 4.0 6.2 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
4 7.5 38 18 15 16 0.6 3.7 7 5.9 1 12 91

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2011-08-01
2011-08-17
2011-09-02
2011-09-19
2012-08-13
2012-08-27
2012-09-10
2012-09-24
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 26 8.2 24 8.1 23 8.6 19 7.9 24 8.4 26 10.6 22 7.1 18 8.4
1 25 8.2 23 8.0 23 8.6 19 7.9 25 8.7 25 10.4 22 7.1 18 8.3
2 25 8.2 23 8.0 22 8.7 19 7.9 25 7.8 24 9.6 22 7.0 18 8.3
3 25 8.1 23 8.0 22 8.6 19 7.8 25 7.8 24 8.2 22 7.0 18 8.2
4 25 7.9 23 8.0 22 8.5 19 7.8 25 7.7 24 7.5 22 6.9 18 8.1
5 24 7.6 23 7.9 22 8.3 19 7.7 25 7.2 24 6.6 22 6.8 18 7.5
6 24 7.5 23 7.9 22 7.2 19 7.6 24 6.0 23 4.6 22 6.8 18 6.9
7 19 7.3

Recent temperature and dissolved oxygen profile plots

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