Where is Clement Pond-Deep Spot?

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

Can I fish at Clement Pond-Deep Spot?

Public access to Clement Pond-Deep Spot is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by New Hampshire's fish and wildlife agency, so check its current regulations before you go.

Clement Pond-Deep Spot

Merrimack County, New Hampshire35 acresView map Directions

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

Phosphorus

11.1 µg/L

Typical for New Hampshire

Measured by NHDES

Chlorophyll-a

5.1 µg/L

Typical for New Hampshire

Measured by NHDES

Area

35 acres

Surface area

Type

Mesotrophic

Trophic class

Mesotrophic
Impaired · Mercury
Public access

See the measurements Directions Where to stay

Clement Pond-Deep Spot in Merrimack County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 11.1 µg/L. Chlorophyll-a (algae): 5.1 µg/L. Surface area: 35 acres.

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Clement Pond-Deep Spot is a 35-acre mesotrophic lake in Merrimack County, New Hampshire. Limited fish-species data available. Public access is available. Compared to the 40 other monitored lakes in Merrimack County, Clement Pond-Deep Spot ranks #28 for water quality.

Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-08-11. Methodology: how these readings are compared.

Swimming conditions

Readings only

Moderate algae

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. Clement Pond-Deep Spot is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, pH / acidity. Check local advisories before you swim.

Whether Clement 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.

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Water quality measurements for Clement Pond-Deep Spot

These are the measurements NHDES publishes for Clement 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 11.1 µg/L. Chlorophyll-a 5.1 µg/L. TSI 43.

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	11.1µg/L	Good GoodFairPoor
Chlorophyll-a (algae)	5.1µg/L	Fair GoodFairPoor
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 Clement Pond-Deep Spot

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

Lake Details

Surface area

35 acres

Public access

Yes

Listed by NHDES

No bathymetric survey has been published for Clement Pond-Deep Spot, so its depth is not documented here.

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Stays near Clement Pond-Deep Spot

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Fishing Clement Pond-Deep Spot

→ Clement Pond-Deep Spot fishing regulations (limits, seasons, special rules)

Reservoir Info (USACE NID)

Clement Pond-Deep Spot is a man-made reservoir impounded by the Grassy Pond Dam (completed 1836), built primarily for recreation on the Intermittent Stream; concrete-type dam, 9 ft tall and 75 ft long.

Surface area: 35 ac
Normal storage: 79 ac-ft
Max storage: 204 ac-ft
Drainage area: 0.9 sq mi
Hazard class: Low
Owner: NH FISH AND GAME DEPARTMENT

Source: USACE National Inventory of Dams, NID ID NH00418 · Operator website · Matched by proximity (0.68 km)

EPA Impairment Status

Clement Pond-Deep Spot is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).

Causes of impairment

MercurypH / acidity

Designated uses not supporting: Aquatic life, Fish consumption.

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

Source: EPA ATTAINS assessment unit NHLAK700030505-01 · Official waterbody report

Nearby Lakes in Merrimack County

Grassy Pond—View →Rolf Pond-Deep Spot0.9 miView →French Pond—View →Upper Pond—View →Tom Pond-Deep SpotEutrophic2.4 miView →Bear Pond—View →

Frequently asked questions about Clement Pond-Deep Spot

Where is Clement Pond-Deep Spot?: Clement Pond-Deep Spot is a lake in Merrimack County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Clement Pond-Deep Spot?: Clement Pond-Deep Spot in Merrimack County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 11.1 µg/L. Chlorophyll-a (algae): 5.1 µg/L. Surface area: 35 acres.
Is Clement Pond-Deep Spot safe to swim in?: Nutrient and algae readings are not a swimming clearance. Clement Pond-Deep Spot is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, pH / acidity. Check local advisories before you swim.
Can I fish at Clement Pond-Deep Spot?: Public access to Clement Pond-Deep Spot is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by New Hampshire's fish and wildlife agency, so check its current regulations before you go.

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