Loon Hollows Pond
Herkimer County, New YorkView mapDirections
NY DEC publishes the water-quality measurements for Loon Hollows Pond. Here is what has been measured.
- Oligotrophic
- Impaired · pH / acidity
- Limited data
Loon Hollows Pond in Herkimer County, New York has water-quality measurements published by NY DEC, shown here as reported. Phosphorus: 5 µg/L. Chlorophyll-a (algae): 1 µg/L.
Loon Hollows Pond is a cold, clear oligotrophic lake in Herkimer County, New York. Overall water quality is declining over recent sampling years. Compared to the 5 other monitored lakes in Herkimer County, Loon Hollows Pond ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2023-09-19. 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. Loon Hollows Pond is listed impaired under Clean Water Act §303(d) (IR 4A) for pH / acidity. Check local advisories before you swim.
Whether Loon Hollows Pond is safe to swim in today is a call for the New York Department of Environmental Conservation and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Loon Hollows Pond
These are the measurements NY DEC publishes for Loon Hollows 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 5 µg/L. Chlorophyll-a 1 µg/L. TSI 29.
| 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 | 5µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 1µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 29 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Loon Hollows Pond
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Loon Hollows Pond typically sits around 69°F at the surface in September. Summer average is about 76°F. Usually warmest in Jul (about 76°F) and coldest in Feb (about 33°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (33°F) to its warmest (76°F).
Typical surface water temperature by month, from 22 field readings (2017–2022) via the EPA Water Quality Portal. See the full Loon Hollows Pond water temperature breakdown →
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Fishing Loon Hollows Pond
Water Quality Trend: Worsening
Based on 4 years of monitoring (2020–2023).
Phosphorus
Worsening+0.25 µg/L/yr4 years
Chlorophyll-a
Worsening+0.3 µg/L/yr3 years
EPA Impairment Status
Loon Hollows Pond is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Aquatic life.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NY0905-0035 · Official waterbody report
Nearby Lakes in Herkimer County
Frequently asked questions about Loon Hollows Pond
Where is Loon Hollows Pond?
- Loon Hollows Pond is a lake in Herkimer County, New York. Its water-quality measurements are published by NY DEC and shown on this page as reported.
What is the water quality of Loon Hollows Pond?
- Loon Hollows Pond in Herkimer County, New York has water-quality measurements published by NY DEC, shown here as reported. Phosphorus: 5 µg/L. Chlorophyll-a (algae): 1 µg/L.
Is Loon Hollows Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Loon Hollows Pond is listed impaired under Clean Water Act §303(d) (IR 4A) for pH / acidity. Check local advisories before you swim.
What is the water temperature of Loon Hollows Pond?
- Loon Hollows Pond typically sits around 69°F at the surface in September, from 22 EPA Water Quality Portal field readings (2017–2022). That is a typical value for the month, not a live reading.
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Where this data comes from
22 measurements from 1 monitoring station, 2020–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- USGS New York Water Science Center
USGS-NY22 samples · 2020–2023
Analytical methods
- P, wu, WCA, persulfate CF color
- Chlorophyll a,fluorometric,uncor
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database