Alta Lake
Lillooet, British ColumbiaView mapDirections
ENV publishes the water-quality measurements for Alta Lake. Here is what has been measured.
- Limited data
Alta Lake in Lillooet, British Columbia has water-quality measurements published by ENV, shown here as reported. Water clarity: 6.4 m visibility. Phosphorus: 3.7 µg/L. Chlorophyll-a (algae): 1.1 µg/L.
Alta Lake is a lake in Lillooet County, British Columbia.
Source: the British Columbia Ministry of Environment and Parks — not the EPA Water Quality Portal, last sampled 2025-10-12. Methodology: how these readings are compared.
What Alta Lake is good for
From access and monitoring records, not editorial picks.
- Clear water21 ft of visibility
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Alta 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.
Water quality measurements for Alta Lake
These are the measurements ENV publishes for Alta Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 21 ft down. Phosphorus 3.7 µg/L. Chlorophyll-a 1.1 µg/L. TSI 29.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 6.4m | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 3.7µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 1.1µg/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. | 29 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
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Answers come straight from the public measurements and survey records on this page.
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Fishing Alta Lake
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Frequently asked questions about Alta Lake
Where is Alta Lake?
- Alta Lake is a lake in Lillooet, British Columbia. Its water-quality measurements are published by ENV and shown on this page as reported.
What is the water quality of Alta Lake?
- Alta Lake in Lillooet, British Columbia has water-quality measurements published by ENV, shown here as reported. Water clarity: 6.4 m visibility. Phosphorus: 3.7 µg/L. Chlorophyll-a (algae): 1.1 µg/L.
Is Alta Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Alta Lake across LakeQuality
More lakes in British Columbia
Other Lakes in British Columbia
Oligotrophic Lakes in British Columbia
Where this data comes from
166 measurements from 1 monitoring station, 2017–2025. 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-bc166 samples · 2017–2025
Monitoring station identifiers (1)
E275784
Canadian lakes are published with the measurements their provincial programme reports. See where the data comes from and data sources.