Data period: through 2018

Town County Delorme Map # True Basin Flushing Rate Elevation
LONG POND TWP SOMERSET 40 2 37.03 flushes/yr 1157 ft
Maximum Depth Average Depth Surface Area Lake Volume Drainage Area
13 m
(44 ft) 		3 m
(9 ft) 		612 ha
(1,512 ac) 		21,690,870 m3
(17,585 ac-ft) 		440 km2
(170 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
1974 3.0 3.0 3.0 1
1984 10 18 2.2 2.4 2.7 2 4.0 4.0 4.0
1992 12 17 2.0 2.6 3.0 3 2.5 3.5 4.7
1996 8 30 20 33 2.5 2.5 2.5 1 6.4 6.4 6.4

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
9 30 17 33 17 2 2.6 3 1.8 2.5 4.6 6.4

Temperature and Dissolved Oxygen Profiles

Late summer only; limited to eight most recent profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L
1984-09-05
1992-08-10
1992-09-10
1996-08-14
Depth (m) TEMP DO TEMP DO TEMP DO TEMP DO
0 18 8.6 20 9.1 18 9.2 21 8.3
1 18 8.5 20 9.2 18 9.3 21 8.2
2 18 8.4 19 9.1 18 9.3 21 8.2
3 18 8.4 19 9.0 18 9.2 21 8.1
4 18 8.4 19 8.6 17 9.0 21 8.0
5 18 8.4 19 8.5 17 9.0 21 7.8
6 18 8.4 18 8.4 17 8.8 20 7.4
7 18 8.4 18 8.2 16 8.6 19 4.4
8 18 8.3 18 7.9 16 8.2 17 3.2
9 18 8.3 18 7.8 17 2.8
10 18 8.3 18 7.6 17 2.4
11 18 7.1 16 1.8
12 16 6.6 16 1.6
13 14 0.3 16 0.9

Most recent temperature and dissolved oxygen profile plots

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