Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
HARTFORD OXFORD 11 2 11.1 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
8 m
(28 ft) 		3 m
(10 ft) 		44 ha
(109 ac) 		707,557 m3
(574 ac-ft) 		14 km2
(5.3 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
1990 14.5 29 7.0 9.3 2.8 3.2 4.0 4 4 2.5 2.8 3.1
1991 11.0 3.0 3.0 3.0 1 1 4.2 4.2 4.2
1997 11.3 3.4 3.7 4.0 3 3 2.5 3.2 3.6
1998 12.5 2.5 3.5 4.0 4 12 1.8 2.3 2.9
1999 11.0 3.7 4.1 4.2 6 12 3.8 3.8 3.8
2000 12.2 3.8 4.0 4.2 7 9 3.1 4.6 5.3
2001 7.0 36 6.6 11.2 3.7 4.0 4.2 4 12 1.7 2.6 4.9
2002 11.3 3.3 3.6 4.1 5 3 3.2 6.6 13.0
2003 10.0 3.9 4.0 4.0 2 2 4.1 4.1 4.1
2004 9.5 3.6 4.1 4.3 5 4 2.9 2.9 2.9
2005 8.0 3.6 3.9 4.2 4 3 3.7 3.7 3.7
2006 13.0 3.2 3.4 3.7 1 9.8 9.8 9.8
2007 17 7.8 33 7.2 12.0 3.7 3.9 4.0 2 2 3.8 6.3 8.4
2008 3.7 3.7 3.7 1 1
2009 3.9 4.0 4.0 2 1
2010 3.7 3.8 4.0 2 2
2011 4.2 4.2 4.2 1 1 3.3 3.3 3.3
2012 3.7 3.7 3.8 2 2 4.6 5.0 5.4
2013 13.5 3.2 3.4 3.6 2 3.0 3.7 4.4
2015 10.5 3.5 3.6 3.7 1 3.7 3.8 4.0
2016 13.5 3.4 3.5 3.5 2 3 3.5 3.8 4.1
2017 9.5 3.4 3.7 3.9 2 2 4.2 4.8 5.5

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
17 9.8 33 6.9 11 2.5 3.7 4.3 2.9 1.7 4.3 13

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2011-08-21
2012-08-18
2013-08-22
2013-09-01
2015-08-04
2015-08-23
2016-08-16
2017-09-14
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 24 8.6 25 7.6 25 8.5 25 8.3 26 7.8 26 7.8 25 8.2 20 9.0
1 24 9.0 25 7.6 24 8.4 24 8.3 26 7.7 26 8.1 25 8.3 20 9.1
2 24 9.3 24 7.2 22 7.9 24 7.7 26 7.6 26 8.2 25 8.2 20 9.2
3 23 8.9 24 7.1 20 8.1 22 4.9 26 7.4 25 8.0 25 8.0 19 9.1
4 22 0.2

Recent temperature and dissolved oxygen profile plots

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