THE BOWL

Data period: through 2022

Use the tabs below to view the different datasets.

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Lake
Information

Town	County	Delorme Map #	True Basin	Flushing Rate	Elevation
BAR HARBOR	HANCOCK	16	1	1.28 flushes/yr	410 ft

Maximum Depth	Average Depth	Surface Area	Lake Volume	Drainage Area
NA m (NA ft)	NA m (NA ft)	2 ha (5 ac)	138,000 m3 (112 ac-ft)	0 km2 (0.1 mi2)

 

 

The Bowl lake type: Coastal Shallow Lake

 

Secchi
Transparency

Secchi Disk Transparency Plots

 

 

   
There are no 2022 Secchi transparency data for The Bowl.

 

Temperature
& Oxygen Profiles

Temperature & Dissolved Oxygen Profiles

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

 

 

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

 

	1996-08-30		2008-09-03
Depth (m)	TEMP	DO	TEMP	DO
0	21	8.4	22	8.1
1	21	8.4	22	8.1
2	21	8.4	22	8.1
3	21	8.3	21	7.9
4	21	8.2	21	7.8
5	20	8.1	21	6.8
6	20	7.9	18	0.6
7	20	7.4	15	0.2
8	19	0.9	12	0.2

Trophic &
Chemistry
Data

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
7.2	1.7	39	6.2		4.5	7		4.6	6.2	8.1	2.6	2.6	2.6

 

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 The Bowl.

 

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
1994			39
1995		2.5	33
1996		3.2	42	6.2			7		4.8	4.8	4.8	1	0	2.6	2.6	2.6
1997		0.9	41						6.0	6.0	6.0	1	0
1998		1.5	36						5.3	6.7	8.1	2	0
1999		0.5	45						5.5	6.3	7.2	2	1
2000		1.1	44						4.6	4.8	5.0	2	0
2001		1.6	44						7.8	7.8	7.9	2	0
2002		1.2	44			4
2007	5.0	1.1	41						5.8	6.0	6.2	2	0
2008	8.3	1.4	34			5			6.5	6.5	6.5	1	0
2009	11.0	1.5	29						6.4	6.4	6.4	1	0
2013	5.5	2.8	38
2014	6.0	2.8	34
2016			44

Water
Quality Trends

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 The Bowl 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.

Fish
List

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

 

There are no fish data for The Bowl.