RANGELEY LAKE

Data period: through 2017

Town	County	Delorme Map #	True Basin	Flushing Rate
RANGELEY	FRANKLIN	28	1	0.39 flushes/yr

Maximum Depth	Average Depth	Surface Area	Lake Volume	Drainage Area
44 m (145 ft)	15 m (49 ft)	2,429 ha (6,002 ac)	359,000,000 m3 (291,046 ac-ft)	114 km2 (44 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
1972		14	85					7.9
1992									4.2	5.5	6.5	3
1996									4.2	4.8	5.3	5	4
1997									4.5	5.3	5.6	6	9
1998									4.6	5.2	5.7	5	4
1999									3.2	5.0	5.6	6	5
2000									4.4	5.0	5.3	5	5
2001									4.6	5.2	5.4	4	7
2002									5.0	5.3	5.4	5	9
2003									5.2	5.4	5.7	6	8
2004									4.6	5.2	5.5	5	9
2005					5				4.6	5.2	5.7	4	1
2006						5.5			4.8	5.2	5.8	4	5
2007									5.1	5.4	5.6	2	2
2008						4.0
2009						4.0			5.0	5.9	7.8	3	1
2010									5.2	5.5	5.8	1	1
2015									4.7	5.2	5.9	4	1
2016									4.3	4.7	5.1	6	10
2017									4.8	4.9	5.2	4	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
	14	85		5	4.5		7.9	3.2	5.2	7.8	4.3	Inf		1

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L

	1972-08-07
Depth (m)	TEMP	DO
1	20	9.0
2
3	20	8.8
4	20	8.8

Recent temperature and dissolved oxygen profile plots

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