Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
EASTBROOK HANCOCK 24 1 0.4 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
14 m
(47 ft) 		5 m
(17 ft) 		507 ha
(1,252 ac) 		25,900,000 m3
(20,997 ac-ft) 		12 km2
(4.7 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 2017 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
1974 6.7 5.2 6.0 6.5 6 1.3 1.8 2.7
1975 6.7 4.5 6.8 8.7 6 1.0 1.6 2.2
1976 4.5 33 8.1 7.5 4.4 5.8 6.9 7 1.1 1.7 2.4
1977 4.5 30 6.0 4.7 5.3 6.0 2
1979 4.5 4.8 5.0 3
1980 4.2 5.3 6.9 5
1981 3.0 36 8.0 5.5 6.6 7.2 5 2.8 2.8 2.8
1983 5.6 6.5 7.2 5
1984 5.0 5.0 12.0 5.5 6.8 7.9 5 1.5 1.5 1.5
1985 5.8 7.9 8.8 6
1986 6.7 7.3 7.9 5
1987 2.0 29 6.0 7.2 7.8 8.1 5
1988 6.9 7.3 7.6 5
1989 6.7 7.3 8.1 5
1990 6.7 7.1 7.6 5
1991 8.0 24 6.8 6.0 6.9 7.2 7.5 5
1992 7.0 7.4 7.9 5
1993 7.9 7.9 7.9 1
2000 7.5 29 10.0 24.0 4.8 4.9 4.9 1 4.0 4.0 4.0
2016 6.7 7.2 7.6 2

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
4.9 30 6.8 7 6.7 14 4.2 6.7 8.8 4.5 1 2.2 4

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1976-09-14
1981-08-21
1984-09-07
1987-08-20
1991-09-05
2000-08-22
2016-09-01
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 19 9.4 22 8.8 19 8.7 24 8.2 20 8.8 22 8.3 24 8.1
1 19 9.4 21 8.8 20 8.7 21 8.6 22 8.2 23 8.2
2 19 9.4 21 8.8 20 8.7 24 8.3 21 8.6 22 8.1 23 8.2
3 19 9.5 21 8.8 20 8.7 21 8.6 21 8.2 23 8.2
4 19 9.5 21 8.7 20 8.7 24 8.3 20 8.5 21 8.2 23 8.2
5 19 9.5 21 8.7 20 8.7 20 8.5 21 8.3 23 8.2
6 18 9.4 20 8.6 20 8.7 22 8.5 20 8.4 21 8.2 23 8.2
7 18 9.3 20 8.5 20 8.7 20 8.4 21 8.1 23 8.2
8 18 9.2 20 7.7 20 8.7 22 7.9 20 8.3 21 8.0 23 8.2
9 18 9.2 20 7.1 20 8.7 21 7.6 20 8.3 20 7.9 23 7.9
10 18 9.2 20 8.6 20 8.1 20 7.7 23 7.4
11 17 9.1 20 8.5 20 8.1 20 5.2 22 7.4
12 17 9.0 20 8.4 16 0.2 20 2.8
13 17 8.9 20 8.3 15 0.1 16 0.2
14 18 1.9 14 0.0 15 0.2

Recent temperature and dissolved oxygen profile plots

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