Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
ORRINGTON PENOBSCOT 23 1 9.27 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
9 m
(31 ft) 		3 m
(11 ft) 		72 ha
(178 ac) 		2,372,520 m3
(1,923 ac-ft) 		12 km2
(4.6 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
1984 4.0 4.8 5.5 5
1985 4.1 33 14 5.2 5.2 5.2 1
1996 5.5 31 7 19 20 3.6 3.6 3.6 1
1997 4.2 4.6 4.9 3
1998 3.3 4.1 4.9 3
1999 4.6 4.7 4.9 2
2000 4.2 4.2 4.2 1

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
4.8 32 7 16 20 3.3 4.5 5.5 2.3 Inf 1

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1985-09-03
1996-09-20
Depth (m) TEMP DO TEMP DO
0 20 8.7 18 8.6
1 19 8.6 17 8.6
2 19 8.3 17 8.4
3 19 8.3 17 8.4
4 19 8.2 17 8.2
5 19 8.2 17 8.4
6 18 7.9 17 8.4
7 18 6.9 17 8.0
8 17 7.6

Recent temperature and dissolved oxygen profile plots

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