Processing math: 100%

Data period: through 2017

Town County Delorme Map # True Basin Flushing Rate
TOPSFIELD WASHINGTON 45 1 0.48 flushes/yr
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
23 m
(76 ft) 		9 m
(30 ft) 		111 ha
(274 ac) 		9,987,721 m3
(8,097 ac-ft) 		8 km2
(2.9 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 (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
1991 9.0 10.0 11.0 5
1992 9.5 10.8 11.0 3
2004 7.1 5 9.3 9.3 9.3 1 1.7 1.7 1.7
2014 8.1 8.3 8.8 2
2015 5 7 23 6.7 2 8.7 8.7 8.7 1 1.0 1.0 1.0

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
5 7 23 6.8 3.5 8.1 9.4 11 2.4 1 1.4 1.7

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
2004-08-19
2015-08-11
Depth (m) TEMP DO TEMP DO
0 22.0 8.7 22.8 8.7
1 22.0 8.7 22.8 8.7
2 22.0 8.7 22.8 8.7
3 22.0 8.7 22.8 8.7
4 22.0 8.7 22.7 8.6
5 21.9 8.7 22.7 8.6
6 21.8 8.7 22.7 8.6
7 21.1 8.7 20.4 9.5
8 17.1 9.9 16.0 10.9
9 14.5 9.6 13.2 11.0
10 12.0 9.8 11.2 10.2
11 10.5 8.7 10.2 9.5
12 9.5 7.6 9.2 8.7
13 9.0 6.1 9.0 8.3
14 8.9 5.4 8.7 8.0
15 8.3 4.8 8.4 7.5
16 8.2 4.7 8.3 7.1
17 8.2 4.7 8.2 7.0
18 8.1 6.6
19 8.0 4.4 8.1 6.5
20 8.0 4.3 8.0 6.4
21 8.0 6.3
22 8.0 6.2
23 7.9 6.0

Recent temperature and dissolved oxygen profile plots

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