Martin Meadow Pond-Deep Spot
Coos County, New HampshireView mapDirections
NHDES publishes the water-quality measurements for Martin Meadow Pond-Deep Spot. Here is what has been measured.
- Mesotrophic
- Impaired · Algal growth
Martin Meadow Pond-Deep Spot in Coos County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 17.1 µg/L. Chlorophyll-a (algae): 3.1 µg/L.
Martin Meadow Pond-Deep Spot is a mesotrophic lake in Coos County, New Hampshire. Compared to the 12 other monitored lakes in Coos County, Martin Meadow Pond-Deep Spot ranks #13 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-07-02. Methodology: how these readings are compared.
Swimming conditions
Readings onlyBacteria advisory
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. Martin Meadow Pond-Deep Spot is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, biotoxins, mercury, nutrients (phosphorus, nitrogen), pH / acidity. Check local advisories before you swim.
Whether Martin Meadow Pond-Deep Spot 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 Martin Meadow Pond-Deep Spot
These are the measurements NHDES publishes for Martin Meadow Pond-Deep Spot, 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 17.1 µg/L. Chlorophyll-a 3.1 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 | 17.1µg/L | Fair GoodFairPoor |
| Chlorophyll-a (algae) | 3.1µg/L | Measured, not scored 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
Ask about Martin Meadow Pond-Deep Spot
Answers come straight from the public measurements and survey records on this page.
Stays via Stay22
Stays near Martin Meadow Pond-Deep Spot
Compare lakeside cabins, hotels, and vacation rentals near Martin Meadow Pond-Deep Spot in Coos County, New Hampshire — 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 Martin Meadow Pond-Deep Spot
Prices for Oct 9–11, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Follow Martin Meadow Pond-Deep Spot’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Martin Meadow Pond-Deep Spot
EPA Impairment Status
Martin Meadow Pond-Deep Spot is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life, Fish consumption, Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHLAK801030102-02 · Official waterbody report
Nearby Lakes in Coos County
Frequently asked questions about Martin Meadow Pond-Deep Spot
Where is Martin Meadow Pond-Deep Spot?
- Martin Meadow Pond-Deep Spot is a lake in Coos County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Martin Meadow Pond-Deep Spot?
- Martin Meadow Pond-Deep Spot in Coos County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 17.1 µg/L. Chlorophyll-a (algae): 3.1 µg/L.
Is Martin Meadow Pond-Deep Spot safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Martin Meadow Pond-Deep Spot is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, biotoxins, mercury, nutrients (phosphorus, nitrogen), pH / acidity. Check local advisories before you swim.
Explore Martin Meadow Pond-Deep Spot across LakeQuality
More lakes in New Hampshire
Other Lakes in New Hampshire
Mesotrophic Lakes in New Hampshire
Where this data comes from
18 measurements from 1 monitoring station, 2021–2025. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- New Hampshire Department Of Environmental Services (BEACH)
1111330018 samples · 2021–2025
Analytical methods
- 10-115-01-1 F ~ LACHAT; Total Phosphorus- Manual persulfate digest
- CHLOROPHYLL A-B-C DETERMINATION (MODIFIED)
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