EAST GRAND LAKE

Processing math: 100%

Data period: through 2017

Town	County	Delorme Map #	True Basin	Flushing Rate
WESTON	AROOSTOOK	45	1	0.58 flushes/yr

Maximum Depth	Average Depth	Surface Area	Lake Volume	Drainage Area
39 m (128 ft)	10 m (31 ft)	6,500 ha (16,062 ac)	616,000,000 m³ (499,399 ac-ft)	355 km² (137 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
1974		11	30
1975		12	24			10			6.5	7.0	7.5	2		1.7	1.7	1.7
1976		12	34
1983									3.5	4.3	5.0	3
1991									7.0	7.6	8.0	2
1992									6.0	6.5	7.0	2
1993									7.0	7.7	9.0	3
1994									6.2	6.4	6.8	4
1995									5.8	8.0	9.7	6
1996									6.4	6.9	7.8	5
1997									5.2	7.1	8.1	4
1998									7.0	8.1	9.6	4
1999									8.1	8.7	9.6	4
2002									7.4	7.6	7.9	5

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
	12	30			10			3.5	7.2	9.7	3.7	1.7	1.7	1.7

Most recent late summer temperature and dissolved oxygen profiles

Units: Temperature (TEMP) = °C; Dissolved Oxygen (DO) = mg/L

	1974-08-21		1975-09-15		1976-08-31
Depth (m)	TEMP	DO	TEMP	DO	TEMP	DO
0	23.0	8.9	16	9.5	18	9.0
1			16	9.5
2	22.5	9.0	16	9.5	18	8.7
3	22.5	9.0	16	9.4
4			16	9.4	19	8.7
5	22.5	9.0	16	9.4
6	6.1	9.0	16	9.4	19	8.6
7			16	9.3
8	21.0	8.7	16	9.4	19	8.7
9	19.5	8.0	16	9.4
10			16	9.3	19	8.7
11	18.0	6.9	16	9.3
12	16.0	6.0	16	9.3	19	8.5
13			16	9.2
14	15.0	5.3	16	9.2	19	8.3
15	15.0	5.1	16	9.2
16			16	9.2	18	5.4
17	14.5	5.0	16	9.2
18	14.0	4.8	16	9.1	16	3.8
19			16	9.1
20	14.0	4.8	16	9.2	16	2.7
21	14.0	4.5	16	9.1
22					15	1.7

Recent temperature and dissolved oxygen profile plots

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