Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
MT CHASE PENOBSCOT 51 1 2.05 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
20 m
(64 ft) 		6 m
(18 ft) 		220 ha
(543 ac) 		12,300,000 m3
(9,972 ac-ft) 		43 km2
(17 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 9.3 3.1 3.8 5.0 6 1.5 2.7 3.7
1975 8.6 3.2 3.9 4.8 6 2.1 2.8 4.5
1976 9.1 34 10 11 2.8 4.3 5.2 7 1.5 2.7 5.7
1977 8 3.8 3.8 3.8 1
1981 3.5 3.7 3.9 4
1982 8.0 18 18 10 4.5 4.5 4.5 1 3.6 3.6 3.6
1996 9.0 28 11 3.4 3.4 3.4 1 5.5 5.5 5.5
2001 10.5 31 7.2 10 15 6.6 6.6 6.6 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
9.1 28 7.2 13 8.9 11 2.8 4.2 6.6 3.4 1.5 3.5 5.7

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1976-08-24
1982-08-12
1996-08-12
2001-08-23
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO
0 22 8.8 19.5 8.8 22 8.6 23.0 8.8
1 22 8.7 19.5 8.9 22 8.7 22.5 8.9
2 22 8.7 19.1 8.8 22 8.7 22.0 8.9
3 22 8.6 19.0 8.7 22 8.7 21.8 8.7
4 20 8.2 19.0 8.7 22 8.7 21.5 8.7
5 19 7.3 18.5 8.4 19 5.3 21.5 8.1
6 18 6.3 18.0 7.4 18 4.4 18.0 3.9
7 16 4.9 17.0 5.8 17 3.4 15.0 1.2
8 14 3.0 13.5 2.9 16 2.7 12.0 0.9
9 12 2.2 11.0 2.7 14 2.2 10.8 0.9
10 11 2.2 10.3 2.6 14 1.9 9.8 0.7
11 10 2.2 9.5 2.6 12 1.5 9.0 0.6
12 10 2.1 9.0 2.3 12 1.4 9.0 0.5
13 11 1.3 8.9 0.4
14 10 1.9 8.8 1.8 11 1.0 8.8 0.3
15 11 0.9 8.8 0.3
16 10 1.9 8.8 1.7 8.7 0.2
17 10 1.9
18 10 1.9

Recent temperature and dissolved oxygen profile plots

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