Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
SULLIVAN HANCOCK 24 1 1.58 flushes/yr 122 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
10 m
(32 ft) 		4 m
(12 ft) 		216 ha
(534 ac) 		8,032,966 m3
(6,512 ac-ft) 		18 km2
(6.9 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
1976 3 29 7 6 2.7 3.2 3.7 2 1.7 2.6 3.5
1977 7 5.2 5.2 5.2 1
1979 3 3.5 3.6 3.7 2
1980 3.5 3.7 4.5 3
1981 3 40 7 3.6 3.6 3.6 1 2.7 2.7 2.7
2008 5.9 5.9 5.9 1
2009 7
2010 7 12 4.6 4.7 4.7 1 2.8 2.8 2.8
2011 7 12 4.6 4.6 4.6 1 4.5 4.5 4.5
2016 25 6 69 6.6 6 17 5.7 5.7 5.7 1 3.7 3.7 3.7
2018 29 6 34 6.8 8 17 4.8 4.8 4.8 1 5.0 5.0 5.0

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
27 4.5 43 6.7 7 5.3 13 2.7 4.5 5.9 1.4 1.7 3.5 5

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1976-08-30
1981-08-21
2010-08-23
2011-08-15
2016-08-15
2018-08-21
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 20 7.8 22 8.9 22 7.4 23 7.6 24 8.4 24 8.2
1 20 7.6 22 8.9 22 7.3 23 7.6 24 8.3 24 8.2
2 20 7.6 22 8.9 22 7.2 23 7.6 24 8.3 24 8.2
3 20 7.6 21 8.6 22 7.2 22 7.2 24 8.1 24 8.1
4 20 7.6 20 8.4 22 7.1 22 7.0 23 7.8 24 7.9
5 20 7.6 20 8.0 22 5.7 21 6.4 23 6.4 23 7.6
6 20 7.6 20 7.9 22 3.4 20 3.6 22 4.1 23 5.8
7 20 7.6 20 7.8 20 1.2 17 0.7 20 1.3 18 0.6
8 20 7.5 20 7.3 18 0.2 14 0.2 18 0.2 18 0.5
9 18 3.5 14 0.2 16 0.1 17 0.5
10 16 0.1

Most recent temperature and dissolved oxygen profile plots

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