Where is Harvey Lake-Deep Spot?

Harvey Lake-Deep Spot is a lake in Rockingham County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.

Harvey Lake-Deep Spot

Rockingham County, New HampshireView map Directions

NHDES publishes the water-quality measurements for Harvey Lake-Deep Spot. Here is what has been measured.

Phosphorus

21.1 µg/L

More phosphorus than most

Measured by NHDES

Chlorophyll-a

9.9 µg/L

More algae than most

Measured by NHDES

Type

Eutrophic

Trophic class

Eutrophic
Impaired · Algal growth

See the measurements Directions Where to stay

Harvey Lake-Deep Spot in Rockingham County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 21.1 µg/L. Chlorophyll-a (algae): 9.9 µg/L.

Loading map…

Harvey Lake-Deep Spot is a productive, nutrient-rich eutrophic lake in Rockingham County, New Hampshire. Compared to the 50 other monitored lakes in Rockingham County, Harvey Lake-Deep Spot ranks #46 for water quality.

Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-09-02. Methodology: how these readings are compared.

Swimming conditions

Readings only

Bacteria 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. Harvey Lake-Deep Spot is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, biotoxins, mercury, oxygen depletion (low DO), pH / acidity. Check local advisories before you swim.

Whether Harvey Lake-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.

Get alerts for Harvey Lake-Deep Spot →

Water quality measurements for Harvey Lake-Deep Spot

These are the measurements NHDES publishes for Harvey Lake-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 21.1 µg/L. Chlorophyll-a 9.9 µg/L. TSI 51.

Water quality readings
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	21.1µg/L	Fair GoodFairPoor
Chlorophyll-a (algae)	9.9µg/L	Poor GoodFairPoor
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

Ask about Harvey Lake-Deep Spot

Answers come straight from the public measurements and survey records on this page.

Stays via Stay22

Stays near Harvey Lake-Deep Spot

Compare lakeside cabins, hotels, and vacation rentals near Harvey Lake-Deep Spot in Rockingham 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. The water-quality readings cover nutrients and algae, not lodging. Cabins and rentals around Harvey Lake-Deep Spot are listed below.

Top-rated places to stay near Harvey Lake-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 Harvey Lake-Deep Spot’s readings

Email me when new measurements post for this lake. Updates stay free.

Or email

Fishing Harvey Lake-Deep Spot

→ Harvey Lake-Deep Spot fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Harvey Lake-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

Algal growthBiotoxinsMercuryOxygen depletion (low DO)pH / acidity

Designated uses not supporting: Aquatic life, Fish consumption, Recreation.

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit NHLAK700060502-05 · Official waterbody report

Nearby Lakes in Rockingham County

Harvey Lake-Boat Launch0.2 miView →Little Bow Pond—View →Northwood Lake-Horse FarmEutrophic1.5 miView →Northwood Lake-Pine Point1.7 miView →Northwood Lake-Lynn Grove BeachOligotrophic1.8 miView →Durgin Pond—View →

Frequently asked questions about Harvey Lake-Deep Spot

Where is Harvey Lake-Deep Spot?: Harvey Lake-Deep Spot is a lake in Rockingham County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Harvey Lake-Deep Spot?: Harvey Lake-Deep Spot in Rockingham County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 21.1 µg/L. Chlorophyll-a (algae): 9.9 µg/L.
Is Harvey Lake-Deep Spot safe to swim in?: Nutrient and algae readings are not a swimming clearance. Harvey Lake-Deep Spot is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, biotoxins, mercury, oxygen depletion (low DO), pH / acidity. Check local advisories before you swim.

Explore Harvey Lake-Deep Spot across LakeQuality

Lake Fishing Forecast

Species activity outlook by water temperature and season

More lakes in New Hampshire

All New Hampshire lakes

Every New Hampshire lake with its NHDES measurements

Lake water quality by country

Official ratings and named-lake measurements