Where is O'Brien Lake?

O'Brien Lake is a lake in Halifax, Nova Scotia. Its water-quality measurements are published by NSECC and shown on this page as reported.

O'Brien Lake

Halifax, Nova ScotiaView map Directions

NSECC publishes the water-quality measurements for O'Brien Lake. Here is what has been measured.

Phosphorus

7 µg/L

Typical for Nova Scotia

Measured by NSECC

Limited data

See the measurements Directions Where to stay

O'Brien Lake in Halifax, Nova Scotia has water-quality measurements published by NSECC, shown here as reported. Phosphorus: 7 µg/L.

Loading map…

O'Brien Lake is a lake in Halifax County, Nova Scotia.

Source: Nova Scotia Environment and Climate Change — not the EPA Water Quality Portal, last sampled 1984-12-12. 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 O'Brien 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.

Get alerts for O'Brien Lake →

Water quality measurements for O'Brien Lake

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

No clarity data. Phosphorus 7 µg/L. TSI 32.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)		No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	7µg/L	Measured, not scored 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.	32	Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Low nutrients, clear water. No reading is a swimming clearance.

Ask about O'Brien Lake

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

Stays via Stay22

Stays near O'Brien Lake

Compare lakeside cabins, hotels, and vacation rentals near O'Brien Lake in Halifax, Nova Scotia — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.

Top-rated places to stay near O'Brien Lake

Prices for Oct 23–25, 4 adults. Change dates on the map below.

Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.

Follow O'Brien Lake’s readings

Email me when new measurements post for this lake. Updates stay free.

Or email

Fishing O'Brien Lake

→ O'Brien Lake fishing regulations (limits, seasons, special rules)

Nearby Lakes in Halifax

Eagle Lake4.5 m clear2.3 miView →Tangier Lake2.1 m clear2.9 miView →Mill Lake2.6 m clear2.8 miView →Glawsons Long Lake0.8 m clear3.7 miView →Hatchet Lake5.9 m clear3 miView →Tangier Grand Lake4.1 m clear3.1 miView →

Frequently asked questions about O'Brien Lake

Where is O'Brien Lake?: O'Brien Lake is a lake in Halifax, Nova Scotia. Its water-quality measurements are published by NSECC and shown on this page as reported.
What is the water quality of O'Brien Lake?: O'Brien Lake in Halifax, Nova Scotia has water-quality measurements published by NSECC, shown here as reported. Phosphorus: 7 µg/L.
Is O'Brien Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.