Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
OLD TOWN PENOBSCOT 33 1 1.96 flushes/yr 115 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
8 m
(28 ft) 		3 m
(10 ft) 		2,045 ha
(5,054 ac) 		65,500,000 m3
(53,102 ac-ft) 		195 km2
(75 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
1996 2.0 2.4 2.6 5
1997 2.7 3.4 3.7 3 4
1998 2.6 3.1 3.7 4 4
1999 3.0 3.2 3.4 2 1
2000 2.2 2.5 2.9 3
2015 18 3.1 3.4 3.6 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
18 2 3 3.7 3.2 Inf 1

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1997-08-10
1997-09-07
1998-08-22
2000-08-19
2015-09-12
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 23 8.0 19 9.3 21 8.1 21 8.8 23 7.7
1 23 8.0 19 9.2 21 8.1 21 8.8 22 7.6
2 23 8.0 19 9.2 21 8.0 21 8.8 22 7.7
3 23 7.9 19 9.1 21 7.9 21 8.7 21 7.8

Most recent temperature and dissolved oxygen profile plots

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