Branch Pond
Grafton County, New HampshireView mapDirections
NHDES publishes the water-quality measurements for Branch Pond. Here is what has been measured.
- Limited data
Branch Pond in Grafton County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 14.3 µg/L.
Branch Pond is a lake in Grafton County, New Hampshire.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2021-08-12. 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 Branch Pond is safe to swim in today is a call for the New Hampshire Department of Environmental Services and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Branch Pond
These are the measurements NHDES publishes for Branch Pond, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 14.3 µg/L. TSI 43.
| 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 | 14.3µg/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. | 43 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
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Frequently asked questions about Branch Pond
Where is Branch Pond?
- Branch Pond is a lake in Grafton County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Branch Pond?
- Branch Pond in Grafton County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 14.3 µg/L.
Is Branch Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Branch Pond across LakeQuality
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Where this data comes from
1 measurement from 1 monitoring station, 2021. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- Vermont Dept of Environmental Conservation
1VTDECWQ1 sample · 2021
Analytical methods
- EPA approved Alternate Test Procedure for 4500 P H. Has a 28 day hold without acid preservation.
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.