Carr Brook (Blackwell Brook Lake
Carr Brook (Blackwell Brook Lake in Derbys Notts and Leics, England has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 100 µg/L. Chlorophyll-a (algae): 5.4 µg/L.
Why Carr Brook (Blackwell Brook Lake has no A–F grade
Carr Brook (Blackwell Brook 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).
Carr Brook (Blackwell Brook Lake is a lake in Derbys Notts and Leics County, England.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-03-02. 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 Carr Brook (Blackwell Brook Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Phosphorus level: 100 µg/L. Chlorophyll-a: 5.4 µg/L. Trophic State Index: 59.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 100 µg/L | Not graded |
| Chlorophyll-a (Algae) | 5.4 µg/L | Not graded |
| Trophic State Index (TSI) | 59 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Carr Brook (Blackwell Brook Lake
Compare lakeside cabins, hotels, and vacation rentals near Carr Brook (Blackwell Brook Lake in Derbys Notts and Leics, 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 Carr Brook (Blackwell Brook Lake
Frequently asked questions about Carr Brook (Blackwell Brook Lake
What is the water quality of Carr Brook (Blackwell Brook Lake?
- Carr Brook (Blackwell Brook Lake in Derbys Notts and Leics, England has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 100 µg/L. Chlorophyll-a (algae): 5.4 µg/L.
Is Carr Brook (Blackwell Brook Lake safe to swim in?
- Carr Brook (Blackwell Brook 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 Carr Brook (Blackwell Brook Lake across LakeGrade
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Where this data comes from
112 measurements from 1 monitoring station, 2016–2022. Retrieved from the Environment Agency (England; not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Environment Agency (England)
ea-wqa112 samples · 2016–2022
Monitoring station identifiers (1)
MD-53784835
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: 2022-03-02
Monitoring stations: 1