Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
HARTFORD OXFORD 11 1 2.5 flushes/yr 373 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
8 m
(28 ft) 		3 m
(10 ft) 		131 ha
(324 ac) 		4,211,018 m3
(3,414 ac-ft) 		4 km2
(1.6 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 5.0 6.4 7.5 3 3
1978 9.0 38 10.0 5.8 6.1 6.6 4 4 2.1 2.1 2.1
1979 5.2 5.6 6.4 5 5
1980 9.0 15 10.0 4.8 5.9 6.8 5 6 3.2 3.2 3.2
1981 5.5 6.4 7.5 6 4
1982 5.5 6.3 7.0 6
1983 9.0 8.0 6.0 4.8 6.1 7.0 7 2.4 2.4 2.4
1984 7.0 5.5 6.3 7.2 6 3.0 3.0 3.0
1985 5.5 6.5 7.3 6
1986 8.0 20 9.0 12.0 5.0 6.1 7.0 7
1987 4.0 5.4 7.0 6
1988 8.0 27 11.0 4.0 5.2 6.5 6
1989 3.5 4.8 6.0 6
1990 12.0 26 7.2 9.4 4.5 5.6 6.9 6 1.9 2.5 2.9
1991 11.1 4.5 5.1 6.0 6 4.5 4.5 4.5
1992 4.5 5.2 6.0 6
1993 9.0 7.0 27.0 4.0 5.3 6.7 7
1994 10.0 7.0 15.0 4.8 5.4 5.9 6 4.6 4.6 4.6
1995 4.6 5.5 6.3 6
1996 11.5 7.3 9.0 16.0 3.8 5.0 5.4 6
1997 8.3 18.7 5.6 6.6 7.6 7 2.4 3.1 3.5
1998 10.0 24.7 3.4 5.2 6.9 8 2.5 3.2 4.0
1999 39 8.2 22.0 4.5 5.8 6.4 8 2.1 3.2 4.2
2000 10.0 16.0 4.5 5.3 5.7 6 3.3 4.4 6.5
2001 8.5 38 6.9 11.0 15.7 5.2 5.7 5.9 6 2.4 3.5 5.1
2002 10.0 42 10.2 13.8 4.8 5.5 6.6 8 2.4 5.6 10.2
2003 9.0 24.0 5.3 6.1 6.8 8 2.6 2.6 2.6
2004 9.2 18.5 5.7 6.3 7.7 8 2.4 2.9 3.4
2005 7.2 12.8 5.0 5.6 6.3 6 3.2 3.3 3.4
2006 7.7 13.0 5.2 5.6 6.3 6 3.1 3.4 3.8
2007 12.0 7.9 33 7.2 12.2 12.8 5.6 6.2 7.1 9 2.3 3.1 3.5
2008 5.1 6.0 6.6 6
2009 5.3 5.7 5.9 3
2010 4.9 5.3 6.1 4
2011 13.0 21.0 3.5 5.5 6.6 4 2.1 3.8 9.1
2012 10.0 9.3 36 7.0 6.0 6 22.0 5.8 6.0 6.2 3 2.4 3.2 4.0
2013 9.2 16.0 4.8 5.2 5.9 3 3.0 3.7 5.5
2014 4.3 4.9 5.6 2
2015 7.8 8.8 6.4 6.8 7.2 2 2.1 2.7 3.5
2016 9.5 17.8 4.4 5.2 5.8 4 3.2 4.5 5.1
2017 8.2 8.8 5.6 6.4 7.2 3 2.0 3.9 5.6
2018 6.5 10.0 52 7.3 11.0 4.9 5.3 5.7 4 5.0 5.5 6.0

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
9.5 9.2 33 7.2 9.2 6 16 10 3.4 5.7 7.7 5.6 1.9 3.5 10

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2015-08-23
2015-09-06
2016-08-16
2016-09-10
2017-08-06
2017-09-14
2018-08-23
2018-09-04
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 26 8.1 25 8.1 25 8.1 24 9.2 24 8.0 20 8.8 24 7.2 26 8.5
1 26 8.5 25 8.4 25 8.0 24 8.9 24 7.7 20 8.8 24 7.1 26 8.6
2 26 8.4 25 8.2 25 8.1 24 7.0 24 7.7 20 8.8 24 7.1 25 8.6
3 26 7.9 24 8.2 25 8.1 24 5.8 24 7.6 20 8.7 24 7.1 25 8.5
4 26 7.7 24 7.9 25 8.2 24 5.2 24 7.6 19 8.7 24 7.1 25 8.4
5 25 7.5 24 7.8 25 7.4 23 4.9 24 7.6 19 8.4 24 7.1 24 8.5
6 24 5.1 24 7.7 24 5.8 23 4.0 24 7.6 19 8.1 24 7.1 24 7.9
7 22 1.6 23 3.5 22 0.5 22 3.7 23 6.8 19 7.9 24 5.1 23 5.8
8 17 0.4 17 0.5 17 0.4 20 0.7 17 2.8 19 7.3 17 0.1
9 13 1.2 13 2.4 14 0.3 16 0.5 14 1.7 16 3.0 12 1.5
10 12 0.1

Most recent temperature and dissolved oxygen profile plots

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