Barrage du Gast
Barrage du Gast in Calvados, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1.4 m visibility. Chlorophyll-a (algae): 15 µg/L.
- Clarity
- 1.4 m
Why Barrage du Gast has no A–F grade
Barrage du Gast in France 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 water clarity and algae (chlorophyll-a), but not phosphorus.
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 French water agencies, via UNEP GEMS/Water.
Barrage du Gast is a lake in Calvados County, France.
Source: the French water agencies, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2026-05-26. Grade methodology: LakeGrade methodology.
Watch Barrage du Gast water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Barrage du Gast
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Murky, only visible to about 4.6 ft. Chlorophyll-a: 15 µg/L. Trophic State Index: 56.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.4 m | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 15 µg/L | Not graded |
| Trophic State Index (TSI) | 56 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Barrage du Gast
Compare lakeside cabins, hotels, and vacation rentals near Barrage du Gast in Calvados, France — 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.
Top-rated places to stay near Barrage du Gast
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Fishing Barrage du Gast
Frequently asked questions about Barrage du Gast
What is the water quality of Barrage du Gast?
- Barrage du Gast in Calvados, France has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1.4 m visibility. Chlorophyll-a (algae): 15 µg/L.
Is Barrage du Gast safe to swim in?
- Barrage du Gast 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 Barrage du Gast across LakeGrade
More lakes in France
Where this data comes from
20 measurements from 1 monitoring station, 2020–2026. Retrieved from UNEP GEMS/Water GFQA (not the EPA Water Quality Portal) on 2026-08-20.
Collected and reported by
- Office français de la biodiversité (Hub'Eau)
hubeau-fr20 samples · —
Analytical methods
- Hub'Eau / Naïades plans d'eau
Monitoring station identifiers (1)
I7005803
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See how grades are calculated and data sources.