Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
UNION KNOX 14 1 18.77 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
14 m
(45 ft) 		6 m
(21 ft) 		212 ha
(524 ac) 		13,640,900 m3
(11,059 ac-ft) 		14 km2
(5.2 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 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
1981 12 47 17 18 1.8 2.3 3.7 4 6.6 6.6 6.6
1982 9 47 14 23 2.3 2.7 3.8 7 2.3 3.2 5.4
1983 9 48 1.3 2.3 3.1 8
1984 1.6 2.2 3.4 6
1985 10 36 12 36 2.1 2.6 4.4 6
1986 1.5 1.9 2.3 5
1987 1.9 2.2 2.5 6
1988 8 11 90 1.8 2.3 4.2 6
1989 1.8 2.0 2.4 6
1990 1.7 2.1 2.4 6
1991 11 40 7.1 14 2.0 2.4 3.4 6 4.8 4.8 4.8
1995 3.2 3.4 3.6 4
1997 2.3 3.1 4.1 5
1998 2.5 3.2 4.2 5
1999 9 46 16 24 3.1 3.6 4.0 1 6.8 6.8 6.8
2012 3.9 3.9 3.9 1
2013 28 11 48 7.1 15 21 3.6 3.6 3.6 1 8.6 8.6 8.6
2015 12 10 47 7.1 9 40 5.4 5.4 5.4 1 3.1 3.1 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
20 9.9 45 7.1 14 36 1.3 2.9 5.4 4.7 2.3 5.5 8.6

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1981-08-28
1982-08-30
1985-08-29
1988-09-02
1991-09-06
1999-08-10
2013-08-13
2015-08-31
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO TEMP DO
0 21 8.3 20 8.1 22 7.8 19 8.5 22 8.3 23 7.8 23 8.2 25.5 8.4
1 19 8.1 21 8.3 23 7.8 23 8.2 25.5 8.4
2 21 8.1 19 8.1 22 7.6 19 8.5 21 8.2 23 7.8 23 8.2 25.4 8.4
3 19 8.0 21 8.0 23 7.7 23 8.0 24.7 8.1
4 21 7.9 19 7.9 22 7.6 19 8.3 21 8.0 23 7.7 22 7.1 24.4 8.0
5 19 7.9 20 7.9 23 7.7 21 4.8 23.7 5.9
6 21 7.8 19 8.0 22 7.5 18 6.2 20 7.8 22 6.5 16 0.6 20.8 0.6
7 20 5.7 19 8.0 21 6.4 18 5.7 20 6.3 18 0.2 14 0.6 17.2 0.5
8 19 2.7 17 2.2 19 0.4 14 0.5 18 0.6 16 0.1 13 0.4 15.0 0.4
9 17 0.4 15 0.4 18 0.3 13 0.4 16 0.3 15 0.1 13 0.3 13.4 0.3
10 16 0.4 14 0.3 17 0.2 12 0.4 15 0.3 14 0.1 12 0.3 12.4 0.3
11 13 0.2 13 0.3 12 0.1 12 0.4 11.4 0.3
12 14 0.2 12 0.2 14 0.2 11 0.4 12 0.2 12 0.1 11 0.3 10.5 0.3
13 11 0.2 12 0.2 11 0.1 11 0.3 9.6 0.3
14 11 0.2 13 0.2

Recent temperature and dissolved oxygen profile plots

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