Where is Lake Koocanusa?

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

Lake Koocanusa

Bull River, British ColumbiaView map Directions

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

Clarity

2 m

Murkier than most

Secchi · sampled 2026

Phosphorus

6.5 µg/L

Typical for British Columbia

Measured by ENV

Chlorophyll-a

1.4 µg/L

Typical for British Columbia

Measured by ENV

Limited data

See the measurements Directions Where to stay

Lake Koocanusa in Bull River, British Columbia has water-quality measurements published by ENV, shown here as reported. Water clarity: 2 m visibility. Phosphorus: 6.5 µg/L. Chlorophyll-a (algae): 1.4 µg/L.

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Lake Koocanusa is a lake in Bull River County, British Columbia.

Source: the British Columbia Ministry of Environment and Parks — not the EPA Water Quality Portal, last sampled 2026-06-29. 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 Lake Koocanusa 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 Lake Koocanusa

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

Murky, only visible to about 6.6 ft. Phosphorus 6.5 µg/L. Chlorophyll-a 1.4 µg/L. TSI 38.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	2m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	6.5µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	1.4µg/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.	38	Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic

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

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Stays near Lake Koocanusa

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Fishing Lake Koocanusa

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

Nearby Lakes in Bull River

Hartley Lake35.2 miView →Moyie Lake6 m clear31.3 miView →Grave Lake54.5 miView →Premier Lake10 m clear60.5 miView →Whiteswan Lake11.3 m clear72 miView →St. Mary's Lake3.4 m clear55.6 miView →

Frequently asked questions about Lake Koocanusa

Where is Lake Koocanusa?: Lake Koocanusa is a lake in Bull River, British Columbia. Its water-quality measurements are published by ENV and shown on this page as reported.
What is the water quality of Lake Koocanusa?: Lake Koocanusa in Bull River, British Columbia has water-quality measurements published by ENV, shown here as reported. Water clarity: 2 m visibility. Phosphorus: 6.5 µg/L. Chlorophyll-a (algae): 1.4 µg/L.
Is Lake Koocanusa safe to swim in?: Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.