北山ダム
Saga, JapanView mapDirections
MOE publishes the water-quality measurements for 北山ダム. Here is what has been measured.
- Limited data
北山ダム in Saga, Japan has official water-quality measurements, shown as reported. Water clarity: 2 m visibility. Phosphorus: 27.5 µg/L.
How 北山ダム is classified
北山ダム in Japan 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 water clarity and phosphorus, but not algae (chlorophyll-a).
LakeQuality publishes no grade of its own beside it. Everything below thathas been measured is reported on this page.
Monitoring: the Ministry of the Environment (Japan).
北山ダム is a lake in Saga County, Japan.
Source: the Ministry of the Environment (Japan) — not the EPA Water Quality Portal, last sampled 2025-03-15. 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 北山ダム is safe to swim in today is a call for the Ministry of the Environment (Japan) and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for 北山ダム
These are the measurements MOE publishes for 北山ダム. More on the source.
Murky, only visible to about 6.6 ft. Phosphorus 27.5 µg/L. TSI 51.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2m | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 27.5µg/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. | 51 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Frequently asked questions about 北山ダム
Where is 北山ダム?
- 北山ダム is a lake in Saga, Japan. This page reports official water-quality measurements, shown as reported.
What is the water quality of 北山ダム?
- 北山ダム in Saga, Japan has official water-quality measurements, shown as reported. Water clarity: 2 m visibility. Phosphorus: 27.5 µg/L.
Is 北山ダム safe to swim in?
- 北山ダム 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
90 measurements from 2 monitoring stations, 2016–2025. Retrieved from Japan MOE public water-body monitoring (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Ministry of the Environment (Japan)
moe-jp90 samples · 2016–2025
Analytical methods
- MOE public water body monitoring (kosui, lakes)
Monitoring station identifiers (2)
41201204120010
Authority classifications are shown as the authority published them. See where the data comes from and data sources.