Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
LEBANON YORK 2 1 15.43 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
15 m
(49 ft) 		3 m
(9 ft) 		317 ha
(783 ac) 		8,557,333 m3
(6,938 ac-ft) 		116 km2
(45 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
1983 11.0 8 13 3.5 4.0 5.2 4 3.0 3.0 3.0
1986 10.5 53 8 16 3.6 3.6 3.6 1
1989 3.0 3.7 4.0 3
1990 12.5 64 6.8 10 3.4 3.4 3.4 1 5.3 5.3 5.3
2001 8.5 75 7.2 8 10 5.4 5.4 5.4 1 5.1 5.1 5.1
2004 20 17.5 87 7.2 10 12 5.2 5.2 5.2 1 4.5 4.5 4.5
2005 28 10.9 84 7.1 8 12 4.2 4.2 4.2 1 4.4 4.4 4.4
2013 30 11.3 76 7.3 14 4.1 4.1 4.1 1 3.5 3.5 3.5
2017 20 13.0 104 7.2 10 12 4.5 4.5 4.5 1 3.6 3.6 3.6

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
24 12 78 7.1 8.9 13 3 4.2 5.4 1.6 3 4.2 5.3

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1986-09-10
1990-09-06
2001-08-15
2004-08-17
2005-08-17
2013-08-15
2017-08-31
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 20 9.5 22.8 7.9 27.0 7.8 24 8.2 25.4 7.1 23.2 8.3 21.7 8.2
1 19 9.2 22.5 8.0 25.3 7.9 23 8.2 25.3 7.0 23.2 8.3 21.8 8.2
2 19 9.1 22.0 8.0 26.0 7.9 23 8.1 25.3 7.0 23.2 8.2 21.8 8.2
3 18 9.1 22.0 7.8 25.7 7.9 23 8.1 25.2 7.0 23.2 8.2 21.7 8.0
4 18 9.0 22.0 7.8 25.3 7.6 23 8.0 25.0 6.8 23.2 8.2 21.7 8.0
5 18 8.8 20.2 1.5 21.9 3.3 22 6.6 16.3 3.5 23.2 8.2 21.6 7.9
6 18 8.5 16.5 0.2 18.0 0.7 18 0.9 12.7 4.1 17.2 0.5 18.7 0.7
7 18 8.4 12.8 0.1 14.3 0.4 15 0.5 10.5 3.8 13.6 0.2 16.1 0.2
8 15 3.0 10.5 0.1 11.6 0.4 13 0.5 9.3 3.0 11.6 0.2 11.8 0.1
9 11 2.2 9.0 0.1 9.2 0.3 12 0.5 8.7 2.7 10.4 0.2 9.8 0.1
10 10 1.8 8.0 0.1 8.7 0.3 11 0.5 8.5 2.5 9.5 0.2 9.1 0.1
11 8.0 0.1 8.3 0.2 11 0.5 8.3 2.0 9.3 0.1 8.6 0.1
12 7.8 0.1 8.1 0.2 11 0.5 8.2 1.7 9.3 0.1 8.5 0.1
13 7.7 0.1 8.0 0.2 8.1 1.4 8.4 0.1
14 8.2 0.7 8.5 0.1

Recent temperature and dissolved oxygen profile plots

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