Arrow Lake
Upper Arrow Lake, 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
Arrow Lake in Upper Arrow Lake, 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. Phosphorus: 4.1 µg/L. Chlorophyll-a (algae): 2.3 µg/L.
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Why Arrow Lake 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 Arrow Lake at any level of sampling. Sampling here has recorded phosphorus and algae (chlorophyll-a), but not water clarity.
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.
Arrow Lake is a lake in Upper Arrow Lake County, British Columbia.
Source: the British Columbia Ministry of Environment and Parks — not the EPA Water Quality Portal, last sampled 2026-08-25. 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 Arrow Lake
These are the measurements ENV publishes for Arrow Lake. No A–F letter applies here: see why.
No clarity data. Phosphorus 4.1 µg/L. Chlorophyll-a 2.3 µg/L. TSI 32.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 4.1 µg/L | Measured, not scored |
| Chlorophyll-a (Algae) | 2.3 µg/L | Measured, not scored |
| Trophic State Index (TSI) | 32 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Fishing Arrow Lake
Nearby Lakes in Upper Arrow Lake
Frequently asked questions about Arrow Lake
Where is Arrow Lake?
- Arrow Lake is a lake in Upper Arrow Lake, 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 Arrow Lake?
- Arrow Lake in Upper Arrow Lake, 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. Phosphorus: 4.1 µg/L. Chlorophyll-a (algae): 2.3 µg/L.
Is Arrow Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Arrow Lake across LakeQuality
More lakes in British Columbia
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Oligotrophic Lakes in British Columbia
Where this data comes from
386 measurements from 5 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-bc386 samples · 2017–2026
Monitoring station identifiers (5)
E225769E225770E225771E225768E225779
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.