Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
ISLAND FALLS AROOSTOOK 52 1 9.84 flushes/yr 430 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
14 m
(47 ft) 		4 m
(12 ft) 		1,160 ha
(2,865 ac) 		42,313,751 m3
(34,304 ac-ft) 		21 km2
(8.2 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
1972 14 48 14 21 9
1977 2.5 2.5 2.5 1 1.1 1.1 1.1
1981 5.0 5.0 5.0 2
2000 3.0 3.1 3.3 2
2001 2.7 3.4 4.6 6
2014 4.3 4.3 4.3 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
14 48 14 21 9 2.5 3.7 5 2.4 1.1 1.1 1.1

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1972-08-08
2000-08-11
2000-08-29
2000-09-14
2001-08-02
2001-08-16
2001-08-30
2001-09-12
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 22 8.5 22 9.2 21 10.0 25 8.8 25 8.5 22 9.0 21 8.9
1 20 7.4 23 7.7 21 9.3 19 9.9 24 8.8 24 8.3 20 8.5 21 8.6
2 22 7.6 20 8.7 19 9.8 24 8.8 24 8.3 21 8.5 21 8.6
3 20 7.2 22 7.5 20 9.2 19 10.0 22 8.3 24 8.0 21 8.6 21 8.6
4 22 7.6 20 9.1 19 9.7 22 7.8 24 7.3 21 8.5 20 8.4
5 21 7.5 20 9.0 19 9.7 22 7.2 23 6.4 21 8.3 20 8.1
6 21 6.4 20 8.7 19 9.8 21 6.7 22 4.4 21 8.2 19 7.5
7 19 3.4 20 8.6 19 9.7 21 5.5 20 3.2 21 8.3 18 7.2
8 18 1.6 20 8.5 19 9.7 19 4.0 18 1.7 21 8.0 18 7.0
9 17 1.1 20 8.4 18 9.2 17 2.4 15 0.5 17 1.3 18 5.8
10 17 0.8 20 7.3 18 8.5 15 1.5 16 0.4 16 0.8 17 3.0
11 17 0.3 19 5.6 18 7.9 13 0.8 14 0.3 14 0.6 17 1.0
12 16 0.0 17 3.5 18 1.6 13 0.3 12 0.3 12 0.4
13 16 0.6 11 0.2 13 0.3
14 15 0.1

Most recent temperature and dissolved oxygen profile plots

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