Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
SOMERVILLE LINCOLN 13 1 26.12 flushes/yr 225 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
2 m
(7 ft) 		1 m
(2 ft) 		79 ha
(195 ac) 		479,163 m3
(388 ac-ft) 		21 km2
(8.1 mi2)

Secchi Disk Transparency Graphs

Graph Legend: Secchi symbols = average Secchi Disk Transparency Values; tick marks = maximum and minimum values for each year.

## [1] "No 2018 Secchi Disk Transparency Data"

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
1981 1.7 2.2 3.0 5
1982 9.5 35 18 1.5 2.2 2.6 5 2 5.7 5.7 5.7
1983 1.9 2.1 2.3 3
2015 39 11.0 17 7.3 12 3.1 3.1 3.1 1 3.7 3.7 3.7

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
39 10 26 7.4 15 1.5 2.4 3.1 3.5 3.7 4.7 5.7

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1982-09-09
2015-08-18
Depth (m) TEMP DO TEMP DO
0 18 8.7 25 8.4
1 18 8.6 26 8.5
2 18 8.5 24 8.0

Most recent temperature and dissolved oxygen profile plots

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