Where is Osoyoos Lake?

Osoyoos Lake is a lake in Okanagan River, British Columbia. Its water-quality measurements are published by ENV and shown on this page as reported.

Osoyoos Lake

Okanagan River, British ColumbiaView map Directions

ENV publishes the water-quality measurements for Osoyoos Lake. Here is what has been measured.

Clarity

4.3 m

Typical for British Columbia

Secchi · sampled 2026

Phosphorus

11.9 µg/L

Typical for British Columbia

Measured by ENV

Chlorophyll-a

5.9 µg/L

More algae than most

Measured by ENV

Limited data

See the measurements Directions Where to stay

Osoyoos Lake in Okanagan River, British Columbia has water-quality measurements published by ENV, shown here as reported. Water clarity: 4.3 m visibility. Phosphorus: 11.9 µg/L. Chlorophyll-a (algae): 5.9 µg/L.

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Osoyoos Lake is a lake in Okanagan River County, British Columbia.

Source: the British Columbia Ministry of Environment and Parks — not the EPA Water Quality Portal, last sampled 2026-03-26. Methodology: how these readings are compared.

What Osoyoos Lake is good for

From access and monitoring records, not editorial picks.

Clear water14.1 ft of visibility

Swimming conditions

No reading

Limited data

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

Whether Osoyoos Lake is safe to swim in today is a call for the British Columbia Ministry of Environment and Parks and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Osoyoos Lake

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

Good clarity, visible to about 14.1 ft. Phosphorus 11.9 µg/L. Chlorophyll-a 5.9 µg/L. TSI 42.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	4.3m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	11.9µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	5.9µg/L	Measured, not scored 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.	42	Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Moderate nutrients, good water quality

Ask about Osoyoos Lake

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

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Stays near Osoyoos Lake

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Fishing Osoyoos Lake

→ Osoyoos Lake fishing regulations (limits, seasons, special rules)

Nearby Lakes in Okanagan River

Vaseaux Lake4.4 m clear19.2 miView →Skaha Lake5.6 m clear27.1 miView →Okanagan Lake5.9 m clear—View →Ellison Lake0.8 m clear—View →Wood Lake3.6 m clear—View →Beaver Lake—View →

Frequently asked questions about Osoyoos Lake

Where is Osoyoos Lake?: Osoyoos Lake is a lake in Okanagan River, British Columbia. Its water-quality measurements are published by ENV and shown on this page as reported.
What is the water quality of Osoyoos Lake?: Osoyoos Lake in Okanagan River, British Columbia has water-quality measurements published by ENV, shown here as reported. Water clarity: 4.3 m visibility. Phosphorus: 11.9 µg/L. Chlorophyll-a (algae): 5.9 µg/L.
Is Osoyoos Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.