ALAMOOSOOK LAKE

Town	County	Delorme Map #	True Basin	Flushing Rate	Elevation
ORLAND	HANCOCK	23	1	7.06 flushes/yr	20 ft

Maximum Depth	Average Depth	Surface Area	Lake Volume	Drainage Area
8 m (28 ft)	5 m (15 ft)	399 ha (986 ac)	18,869,554 m³ (15,298 ac-ft)	53 km² (20 mi²)

Alamoosook Lake lake type: Coastal Shallow Lake

Secchi Disk Transparency Plots

Temperature & Dissolved Oxygen Profiles

Most recent late summer (Aug. 1 - Sept. 7) temperature and dissolved oxygen profile plots

Temperature and Dissolved Oxygen profile Contour Plots
Displayed only for lakes with profile data collected in at least 5 months from May - Oct.

Temperature and Dissolved Oxygen Profile Data

Late summer only (Aug. 1 - Sept. 7); limited to eight most recent profiles

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

	2020-08-10		2020-08-28		2020-09-08		2021-08-09		2021-08-27		2022-08-10		2022-08-25		2022-09-03
Depth (m)	TEMP	DO	TEMP	DO	TEMP	DO	TEMP	DO	TEMP	DO	TEMP	DO	TEMP	DO	TEMP	DO
0	24	8.5	25	8.6	26	7.6	26	8.6	24	8.7	22	8.9	22	8.3	29	8.2
1	24	8.5	24	8.7	26	7.5	26	8.6	24	8.7	22	8.9	22	8.3	26	8.3
2	24	8.4	24	8.6	26	7.4	26	8.6	24	8.6	21	8.9	22	8.3	26	8.3
3	24	8.4	24	8.5	26	7.3	26	8.5	24	8.5	21	8.9	22	8.3	25	8.3
4	23	8.3	24	8.4	26	7.3	24	6.4	23	7.7	21	8.8	22	8.3	25	8.1
5	23	8.0	24	8.2	26	7.4	24	5.5	22	6.6	21	8.5	22	8.3	25	7.5
6	23	7.8	24	5.7	25	7.4	23	2.9	22	5.4	21	8.5	22	8.3	22	0.8
6	23	7.8	24	5.7	25	7.4	23	2.9	22	5.4	21	8.5	22	8.3	24	2.7
6	23	7.8	24	5.7	25	7.4	23	2.9	22	5.2	21	8.5	22	8.3	22	0.8
6	23	7.8	24	5.7	25	7.4	23	2.9	22	5.2	21	8.5	22	8.3	24	2.7
6	23	7.8	24	5.7	25	7.4	23	3.8	22	5.4	21	8.5	22	8.3	22	0.8
6	23	7.8	24	5.7	25	7.4	23	3.8	22	5.4	21	8.5	22	8.3	24	2.7
6	23	7.8	24	5.7	25	7.4	23	3.8	22	5.2	21	8.5	22	8.3	22	0.8
6	23	7.8	24	5.7	25	7.4	23	3.8	22	5.2	21	8.5	22	8.3	24	2.7

Trophic and Chemistry Summary Values

See below for table legend

Avg Color	Avg Alk	Avg Cond	Avg pH	Avg TP EC	Avg TP SG	Avg TP BG	Avg TP PG	SDT Min	SDT Avg	SDT Max	Chl Min	Chl Avg	Chl Max
20	9.9	45	7.1	10	8.5	10	13	2.6	4.7	7.3	1.1	3.6	6

Plot Legend: Solid color bars = parameter ranges for most Maine lakes; horizontal thick black line: mean value for all Maine Lakes; Striped pattern = expected range for Coastal Shallow Lakes; white diamonds: mean values for Alamoosook Lake.

Trophic and Water Chemistry Data

**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	Cond	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
1977							10		3.0	3.8	4.5	8	0
1978		8	42		12				3.0	4.2	5.5	10	0	3.0	3.0	3.0
1979						10			2.9	4.1	5.5	16	0
1980									4.0	4.2	4.5	2	0
1981		8	39	7.0	14				3.5	4.0	4.7	7	0	5.2	5.2	5.2
1982									3.2	4.5	6.0	8	0
1983									3.7	4.9	6.3	7	0
1984									3.6	4.5	5.6	6	0
1985		7	36		6	7			4.2	5.0	5.8	7	0
1986		13	39		8				3.5	4.7	5.4	10	0	1.1	2.2	3.6
1987									3.7	4.5	5.5	7	0
1988									3.7	4.5	5.6	6	0
1989									3.5	4.2	5.0	8	0
1990									3.5	3.8	4.4	6	0
1991		11	41	6.7	8				5.8	5.8	5.8	1	0
1993									4.5	5.7	6.9	9	0
1994				7.2	7				4.5	5.5	7.3	9	3	4.0	4.0	4.0
1995									4.8	5.1	5.9	4	0
1997		10	45	7.3	7				4.3	5.3	5.9	3	0	3.2	3.2	3.2
1999									5.2	5.8	6.2	6	0
2003									4.2	5.1	5.4	7	0
2004	20	10	53			8			5.0	5.0	5.0	1	0	3.5	3.5	3.5
2008									5.1	5.2	5.6	3	0
2009						9			3.8	4.3	4.7	6	0
2010					9				4.5	5.3	6.0	7	0	3.1	3.2	3.3
2011					11				3.5	4.1	5.9	17	0	1.6	3.1	4.6
2012					15			13	3.4	4.7	6.3	23	0	1.8	2.4	3.2
2013	28	10	48	7.2	9				4.2	4.7	5.7	17	0	4.8	4.8	4.8
2014					10				3.8	4.8	6.4	26	0	2.6	2.6	2.6
2015									2.6	4.7	5.8	24	0
2016	15	10	52	7.2	11				3.1	5.0	6.6	28	4	4.8	4.8	4.8
2017	17	10	55	7.2	13				3.5	4.6	6.5	29	0	3.0	4.5	5.7
2018									3.2	4.8	6.3	29	0
2019					10				3.2	4.3	5.0	22	0	3.0	4.7	6.0
2020					10				3.4	4.8	5.8	24	0	2.0	3.7	6.0
2021					12				3.1	4.2	5.2	20	0	3.0	4.0	5.0
2022					11				4.0	4.5	5.3	20	0	2.0	3.0	4.0

Water Quality Trends

Long-term Secchi Disk Transparency (SDT), total phosphorus (TP), and Chlorophyll-a data are used to determine if the trophic state of a lake may be changing. Long-term trends may be calculated if there are at least 10 years of data collected within the last 30 years (1993-2022). If there are at least eight years of data within the most recent 10 years, a recent trend test may be calculated as well. The results of trend tests are presented here if there have been enough data collected from Alamoosook Lake for any of these three parameters.

The Maine Department of Environmental Protection uses Mann-Kendall Tau (τ) trend tests on these data to test for significantly changing conditions. The tau value is a measure of trend direction and magnitude. Positive tau values indicate positive (upward) trends, negative tau values indicate negative (downward) trends. Values further from zero (closer to -1 or 1) indicate a stronger trend. Tau values less than -0.5 or more than 0.5 here suggest the trophic state of a lake may be changing. Trends with p-values less than 0.05 indicate statistically significant trends.

Click here to learn more about how the Maine Department of Environmental Protection uses trend test results to evaluate lakes as part of the Maine water quality standard review process.

Maine IF&W Fish Survey Data

Fish data courtesy of the Maine Department of Inland Fisheries & Wildlife.

See more about Maine’s fisheries here: https://www.maine.gov/ifw/fish-wildlife/fisheries/index.html

Fish species observed from Alamoosook Lake:

Alewife	Alosa pseudoharengus	Native
American Eel	Anguilla rostrata	Native
Banded Killifish	Fundulus diaphanus	Native
Brook Trout	Salvelinus fontinalis	Native
Brown Bullhead	Ameiurus nebulosus	Native
Brown Trout	Salmo trutta	Introduced
Chain Pickerel	Esox niger	Native
Fallfish	Semotilus corporalis	Native
Fourspine Stickleback	Apeltes quadracus	Native
Landlocked Salmon	Salmo salar	Native
Largemouth Bass	Micropterus salmoides	Introduced
Smallmouth Bass	Micropterus dolomieu	Introduced
White Perch	Morone americana	Native
White Sucker	Catostomus commersoni	Native
Yellow Perch	Perca flavescens	Native

All fish images from Maine Department of Inland Fisheries & Wildlife unless noted below

Banded Killifish:	iNaturalist
Fourspine Stickleback:	Connecticut DEEP