Processing math: 100%

Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
OSBORN PLT HANCOCK 24 1 4.36 flushes/yr 255 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
9 m
(30 ft) 		2 m
(8 ft) 		710 ha
(1,754 ac) 		17,300,000 m3
(14,025 ac-ft) 		59 km2
(23 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 (μS/cm), pH: pH (standard units)

TP = Total Phosphorus (μg/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 (μg/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 8.2 3.2 3.8 4.9 6 0.8 2.1 3.6
1975 8.9 3.5 4.2 5.0 6 1.5 2.1 2.4
1976 3.5 23 9.4 8 2.6 3.8 4.6 7 1.5 2.1 3.0
1977 6.0 32 7.0 3.2 3.6 4.0 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
4.8 28 8.2 8.6 8 2.6 3.9 5 5.2 0.8 2.1 3.6

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1976-09-14
Depth (m) TEMP DO
0 18 9.5
1 18 9.6
2 17 9.7
3 17 9.6
4 17 9.5
5 17 9.4
6 17 9.2
7 16 9.0

Most recent temperature and dissolved oxygen profile plots

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