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
1975 3.70 4.6 5.2 3
1976 7.0 24 29 12 11 0.90 4.6 5.6 5 3.1 3.1 3.1
1977 4.90 5.4 6.2 5
1978 9.0 41 18 9 3.70 4.9 5.6 6 1 3.1 3.1 3.1
1979 4.30 5.1 6.1 4
1980 15 4.20 4.7 5.9 6
1981 3.00 4.5 5.8 6
1982 4.00 5.3 7.0 5 1
1983 6.0 12 3.40 4.8 5.5 5
1984 3.50 5.2 6.2 5
1985 3.70 4.1 4.6 5
1986 9.0 30 21 4.00 4.7 5.5 3
1987 7.0 25 22 18 22 23 1.60 2.7 4.8 6 2.9 7.2 13.4
1988 16 3.90 5.3 7.3 7 1 0.4 2.2 4.2
1989 21 12 3.90 4.8 6.6 5
1990 3.30 4.6 6.1 8
1991 8.5 33 7.2 17 2.00 4.1 5.5 8
1992 3.40 4.3 5.8 6
1993 20 1.20 3.3 6.3 8
1994 20 22 1.50 3.5 5.3 6 1 2.4 15.1 27.8
1995 1.30 3.9 6.8 6 1
1996 2.00 3.7 5.0 5
1997 10.5 39 7.1 19 3.40 5.1 6.9 5 3.6 3.6 3.6
1998 0.90 3.0 5.9 5
1999 7.0 22 17 19 1.00 3.5 5.5 7 6.2 14.6 23.0
2000 9.6 42 18 15 16 2.30 3.9 6.2 8 2.7 6.8 11.0
2001 7.5 40 7.1 18 18 3.76 5.0 6.2 5 4.2 4.2 4.2
2002 23.0 11.0 43 18 20 1.50 3.7 5.6 6 10.0 12.7 15.4
2003 5.5 9.5 45 19 15 15 0.60 2.1 4.4 5 15.0 15.0 15.0
2004 6.0 10.0 45 22 22 1.75 3.8 7.0 5 6.2 13.9 21.8
2005 19 12 0.50 2.6 6.3 8 2.6 19.8 64.0
2006 10.0 7.0 43 16 1.70 3.3 6.2 6 3.8 10.8 25.0
2007 16 1.00 4.4 6.8 11 2.1 4.7 11.0
2008 9.0 8.4 41 7.1 11 1.90 4.0 6.8 9 14.0 14.0 14.0
2009 17 0.80 4.2 5.7 9 2.3 10.9 79.0
2010 26 0.50 2.2 4.4 8 3.8 17.8 76.0
2011 16 2.10 5.0 7.2 9 6 1.6 8.2 18.6
2012 30.0 9.1 43 7.3 18 0.60 4.1 6.8 8 1 1.2 13.9 92.0
2013 7.0 8.7 40 7.2 16 16 3.15 4.4 5.8 8 3.6 5.0 9.4
2014 7.5 10.0 42 8.3 19 0.75 3.1 6.5 11 2 1.9 15.1 51.0
2015 6.2 10.0 41 7.3 17 1.50 3.7 6.3 12 1.7 8.1 20.0
2016 7.0 12.0 48 7.7 38 1.30 3.7 6.0 13 25.0 25.0 25.0
2017 4.0 12.5 50 7.9 19 1.32 3.0 5.8 8 18.0 18.0 18.0

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
10 9 40 7.3 19 15 17 16 0.5 4.1 7.3 6.7 0.4 11 92

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2014-09-18
2015-08-10
2015-08-18
2015-08-26
2015-09-09
2015-09-24
2016-08-18
2017-08-15
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 19 8.4 26 8.6 27 8.3 25 8.4 26 9.9 22 8.6 24 8.8 24 8.2
1 19 8.4 26 8.6 27 8.6 25 8.3 25 10.0 22 8.6 24 8.7 24 8.4
2 19 8.4 24 8.5 26 8.6 25 8.1 25 10.0 22 8.7 24 8.7 24 8.1
3 19 8.3 24 8.5 25 8.4 25 8.0 25 9.8 21 8.6 24 8.6 24 7.8
4 18 8.2 24 8.3 24 8.4 24 8.0 25 9.6 21 8.5 24 8.6 23 7.7
5 18 8.0 24 8.2 23 8.1 24 7.8 24 7.9 21 8.1 24 8.6 23 7.2
6 18 7.4 24 8.1 24 6.2 24 7.6 24 7.2 21 5.0 24 8.5 23 6.8
7 24 5.6

Recent temperature and dissolved oxygen profile plots

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