Colt Crag Reservoir
Northumberland Durham and Tees, EnglandView mapDirections
EA publishes the water-quality measurements for Colt Crag Reservoir. Here is what has been measured.
- Limited data
Colt Crag Reservoir in Northumberland Durham and Tees, England has official water-quality measurements, shown as reported. Phosphorus: 43 µg/L.
How Colt Crag Reservoir is classified
Colt Crag Reservoir in England is published with the authority's own measurements and class. The measurements here are published by the agency that samples the lake, as reported. Sampling here has recorded phosphorus, but not water clarity and algae (chlorophyll-a).
LakeQuality publishes no grade of its own beside it. Everything below thathas been measured is reported on this page.
Monitoring: the Environment Agency (England).
Colt Crag Reservoir is a lake in Northumberland Durham and Tees County, England.
Source: the Environment Agency (England) — not the EPA Water Quality Portal, last sampled 2020-03-10. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Colt Crag Reservoir is safe to swim in today is a call for the Environment Agency (England) and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Colt Crag Reservoir
These are the measurements EA publishes for Colt Crag Reservoir. More on the source.
No clarity data. Phosphorus 43 µg/L. TSI 58.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 43µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | No reading 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. | 58 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Frequently asked questions about Colt Crag Reservoir
Where is Colt Crag Reservoir?
- Colt Crag Reservoir is a lake in Northumberland Durham and Tees, England. This page reports official water-quality measurements, shown as reported.
What is the water quality of Colt Crag Reservoir?
- Colt Crag Reservoir in Northumberland Durham and Tees, England has official water-quality measurements, shown as reported. Phosphorus: 43 µg/L.
Is Colt Crag Reservoir safe to swim in?
- Colt Crag Reservoir 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
50 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-wqa50 samples · 2016–2020
Monitoring station identifiers (1)
NE-43100237
Authority classifications are shown as the authority published them. See where the data comes from and data sources.