Gammaton Stream Lake
Gammaton Stream Lake in Devon and Cornwall, England has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 17.5 µg/L. Chlorophyll-a (algae): 11.2 µg/L.
Why Gammaton Stream Lake has no A–F grade
Gammaton Stream Lake in England is published with the authority's own measurements, not a LakeQuality letter. official authority class; not a LakeQuality A–F letter Sampling here has recorded phosphorus and algae (chlorophyll-a), but not water clarity.
A letter on the LakeQuality scale would be an invention, not an official class. Everything below that has been measured is still reported on this page.
Monitoring: the Environment Agency (England).
Gammaton Stream Lake is a lake in Devon and Cornwall County, England.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2020-02-26. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Gammaton Stream Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Phosphorus level: 17.5 µg/L. Chlorophyll-a: 11.2 µg/L. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 17.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 11.2 µg/L | Not graded |
| Trophic State Index (TSI) | 50 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Gammaton Stream Lake
Compare lakeside cabins, hotels, and vacation rentals near Gammaton Stream Lake in Devon and Cornwall, England — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Fishing Gammaton Stream Lake
Frequently asked questions about Gammaton Stream Lake
What is the water quality of Gammaton Stream Lake?
- Gammaton Stream Lake in Devon and Cornwall, England has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 17.5 µg/L. Chlorophyll-a (algae): 11.2 µg/L.
Is Gammaton Stream Lake safe to swim in?
- Gammaton Stream Lake has official nutrient and clarity measurements, not a bacteria swim class and not a safety clearance. Algal blooms, currents, and depth are not covered. Always check local notices before swimming.
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Where this data comes from
100 measurements from 1 monitoring station, 2016–2020. Retrieved from the Environment Agency (England; not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Environment Agency (England)
ea-wqa100 samples · 2016–2020
Monitoring station identifiers (1)
SW-72911179
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See methodology and data sources.
Data Sources
Water quality data from the EPA Water Quality Portal
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2020-02-26
Monitoring stations: 1