Where is Northwest Arm Lake?

Northwest Arm Lake is a lake in Guysborough, Nova Scotia. Its water-quality measurements are published by NSECC and shown on this page as reported.

How deep is Northwest Arm Lake?

Northwest Arm Lake has a maximum depth of 6.6 feet and an average depth of 4.3 feet. The lake covers 43.2 acres.

Northwest Arm Lake

Guysborough, Nova Scotia17 haView map Directions

NSECC publishes the water-quality measurements for Northwest Arm Lake. Here is what has been measured.

Clarity

0.7 m

Murkier than most

Secchi · sampled 1979

Max depth

2 m

Bathymetric survey

Area

17 ha

Surface area

7 ft max depth
Limited data

See the measurements Directions Where to stay

Northwest Arm Lake in Guysborough, Nova Scotia has water-quality measurements published by NSECC, shown here as reported. Water clarity: 0.7 m visibility. Maximum depth: 6.6 ft. Surface area: 43.2 acres.

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Northwest Arm Lake is a 43-acre lake in Guysborough County, Nova Scotia with a maximum depth of 7 feet (4-foot average).

Source: Nova Scotia Environment and Climate Change — not the EPA Water Quality Portal, last sampled 1979-09-06. Methodology: how these readings are compared.

Swimming conditions

No reading

Limited data

Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.

Whether Northwest Arm Lake is safe to swim in today is a call for Nova Scotia Environment and Climate Change and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Northwest Arm Lake

These are the measurements NSECC publishes for Northwest Arm Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.

Very murky, less than 2.3 ft of visibility. TSI 65.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	0.7m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus		No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)		No reading The green pigment in algae — a direct measure of how much algae is in the water.
Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a.	65	Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic

High nutrients, frequent algae, reduced clarity

Ask about Northwest Arm Lake

Answers come straight from the public measurements and survey records on this page.

Lake Details

Max depth

2 m

Average depth

1.3 m

Surface area

17 ha

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Fishing Northwest Arm Lake

→ Northwest Arm Lake fishing regulations (limits, seasons, special rules)

Nearby Lakes in Guysborough

Whidden Lake3 m clear2.7 miView →Glenelg Lake2 m clear4.3 miView →Cumminger Lake4 m clear4.4 miView →Pemmon Lake2.4 m clear4.3 miView →Smith Lake0.7 m clear3.7 miView →Mccarthy Lake1.9 m clear4.8 miView →

Frequently asked questions about Northwest Arm Lake

Where is Northwest Arm Lake?: Northwest Arm Lake is a lake in Guysborough, Nova Scotia. Its water-quality measurements are published by NSECC and shown on this page as reported.
What is the water quality of Northwest Arm Lake?: Northwest Arm Lake in Guysborough, Nova Scotia has water-quality measurements published by NSECC, shown here as reported. Water clarity: 0.7 m visibility. Maximum depth: 6.6 ft. Surface area: 43.2 acres.
Is Northwest Arm Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Northwest Arm Lake?: Northwest Arm Lake has a maximum depth of 6.6 feet and an average depth of 4.3 feet. The lake covers 43.2 acres.