Lake Koocanusa
Bull River, British ColumbiaView mapDirections
No A–F letter for this lake. The letter is scored against EPA reference conditions for a lake’s ecoregion, and those stop at the US border. Here is what has been measured.
- Limited data
Lake Koocanusa in Bull River, British Columbia has water-quality measurements published by ENV and no A–F letter. The letter's EPA reference conditions stop at the US border. Water clarity: 2 m visibility. Phosphorus: 6.5 µg/L. Chlorophyll-a (algae): 1.4 µg/L.
- Clarity
- 2 m
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Why Lake Koocanusa has no A–F letter
The LakeQuality letter is scored against EPA National Lakes Assessment reference conditions for a lake’s ecoregion, and those stop at the US border. There is no reference condition for British Columbia, so the scale cannot be applied to Lake Koocanusa at any level of sampling. Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
This is not a gap in the monitoring record. ENV publishes these measurements directly, and everything below that has been measured is reported on this page as ENV reports it.
Monitoring: the British Columbia Ministry of Environment and Parks. Read the full grading methodology.
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. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Lake Koocanusa
These are the measurements ENV publishes for Lake Koocanusa. No A–F letter applies here: see why.
Murky, only visible to about 6.6 ft. Phosphorus 6.5 µg/L. Chlorophyll-a 1.4 µg/L. TSI 38.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2 m | Measured, not scored |
| Phosphorus | 6.5 µg/L | Measured, not scored |
| Chlorophyll-a (Algae) | 1.4 µg/L | Measured, not scored |
| Trophic State Index (TSI) | 38 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Fishing Lake Koocanusa
Nearby Lakes in Bull River
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 it carries no A–F letter, because no reference condition exists for lakes in this region, so the assessment thresholds behind the A–F scale cannot be applied here.
What is the water quality grade for Lake Koocanusa?
- Lake Koocanusa in Bull River, British Columbia has water-quality measurements published by ENV and no A–F letter. The letter's EPA reference conditions stop at the US border. Water clarity: 2 m visibility. Phosphorus: 6.5 µg/L. Chlorophyll-a (algae): 1.4 µg/L.
Is Lake Koocanusa safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Lake Koocanusa across LakeQuality
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Where this data comes from
9,503 measurements from 9 monitoring stations, 2017–2026. Retrieved from British Columbia EnMoDS (not the EPA Water Quality Portal) on 2026-09-06.
Collected and reported by
- British Columbia Ministry of Environment and Parks
enmods-bc9,503 samples · 2017–2026
Monitoring station identifiers (9)
E300095E300094E300093E300092E330335E330337E330338E300230E330336
Canadian lakes are published with the measurements their provincial programme reports, and without a LakeQuality A–F letter. The letter is scored against EPA reference conditions for a lake’s ecoregion, and the EPA does not survey these lakes. See how grades are calculated and data sources.