Weare Reservoir-Cottage Rd Brook
Hillsborough County, New HampshireView mapDirections
NHDES publishes the water-quality measurements for Weare Reservoir-Cottage Rd Brook. Here is what has been measured.
- Oligotrophic
- Limited data
Weare Reservoir-Cottage Rd Brook in Hillsborough County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 11.4 µg/L.
Weare Reservoir-Cottage Rd Brook is a cold, clear oligotrophic lake in Hillsborough County, New Hampshire. Compared to the 35 other monitored lakes in Hillsborough County, Weare Reservoir-Cottage Rd Brook ranks #14 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-08-28. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Weare Reservoir-Cottage Rd Brook 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 Weare Reservoir-Cottage Rd Brook
These are the measurements NHDES publishes for Weare Reservoir-Cottage Rd Brook, 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 11.4 µg/L. TSI 39.
| 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 | 11.4µg/L | Good GoodFairPoor |
| 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. | 39 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
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Frequently asked questions about Weare Reservoir-Cottage Rd Brook
Where is Weare Reservoir-Cottage Rd Brook?
- Weare Reservoir-Cottage Rd Brook is a lake in Hillsborough County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Weare Reservoir-Cottage Rd Brook?
- Weare Reservoir-Cottage Rd Brook in Hillsborough County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 11.4 µg/L.
Is Weare Reservoir-Cottage Rd Brook safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Weare Reservoir-Cottage Rd Brook across LakeQuality
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Where this data comes from
5 measurements from 1 monitoring station, 2023–2025. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- New Hampshire Department Of Environmental Services (BEACH)
111133005 samples · 2023–2025
Analytical methods
- 10-115-01-1 F ~ LACHAT; Total Phosphorus- Manual persulfate digest
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.