River Tamar Lake
River Tamar Lake in Devon and Cornwall, England has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 71.5 µg/L. Chlorophyll-a (algae): 17 µg/L.
Why River Tamar Lake has no A–F grade
River Tamar 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).
River Tamar Lake is a lake in Devon and Cornwall County, England.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-01-23. 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 River Tamar Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Phosphorus level: 71.5 µg/L. Chlorophyll-a: 17 µg/L. Trophic State Index: 62.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 71.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 17 µg/L | Not graded |
| Trophic State Index (TSI) | 62 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near River Tamar Lake
Compare lakeside cabins, hotels, and vacation rentals near River Tamar 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 River Tamar Lake
Frequently asked questions about River Tamar Lake
What is the water quality of River Tamar Lake?
- River Tamar Lake in Devon and Cornwall, England has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 71.5 µg/L. Chlorophyll-a (algae): 17 µg/L.
Is River Tamar Lake safe to swim in?
- River Tamar 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.
Explore River Tamar Lake across LakeGrade
More lakes in England
Where this data comes from
80 measurements from 2 monitoring stations, 2016–2025. Retrieved from the Environment Agency (England; not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Environment Agency (England)
ea-wqa80 samples · 2016–2025
Monitoring station identifiers (2)
SW-91210289SW-91210318
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: 2025-01-23
Monitoring stations: 2