Pleasant Lake-Outlet
Merrimack County, New Hampshire604 acresView mapDirections
NHDES publishes the water-quality measurements for Pleasant Lake-Outlet. Here is what has been measured.
- Oligotrophic
- Public access
Pleasant Lake-Outlet in Merrimack County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 5 µg/L. Surface area: 604 acres.
Pleasant Lake-Outlet is a 604-acre cold, clear oligotrophic lake in Merrimack County, New Hampshire. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 40 other monitored lakes in Merrimack County, Pleasant Lake-Outlet ranks #11 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-09-10. Methodology: how these readings are compared.
What Pleasant Lake-Outlet is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming conditions
Readings onlyLow 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. Check local advisories before you swim.
Whether Pleasant Lake-Outlet 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 Pleasant Lake-Outlet
These are the measurements NHDES publishes for Pleasant Lake-Outlet, 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. TSI 27.
| 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) | 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. | 27 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Pleasant Lake-Outlet
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
604 acres
Public access
Yes
Listed by NHDES
No bathymetric survey has been published for Pleasant Lake-Outlet, so its depth is not documented here.
Recreation & Access
- Elkins Dam SitePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
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Fishing Pleasant Lake-Outlet
Reservoir Info (USACE NID)
Pleasant Lake-Outlet is a man-made reservoir impounded by the Pleasant Lake Dam (completed 1850), built primarily for recreation on the Tr Blackwater River; earth-type dam, 13 ft tall and 360 ft long.
- Surface area
- 604 ac
- Normal storage
- 6,806 ac-ft
- Max storage
- 9,295 ac-ft
- Drainage area
- 11.03 sq mi
- Hazard class
- High
- Owner
- TOWN OF NEW LONDON
Source: USACE National Inventory of Dams, NID ID NH00362 · Operator website · Matched by proximity (0.04 km)
Nearby Lakes in Merrimack County
Frequently asked questions about Pleasant Lake-Outlet
Where is Pleasant Lake-Outlet?
- Pleasant Lake-Outlet 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 Pleasant Lake-Outlet?
- Pleasant Lake-Outlet in Merrimack County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 5 µg/L. Surface area: 604 acres.
Is Pleasant Lake-Outlet safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on Pleasant Lake-Outlet?
- Pleasant Lake-Outlet has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Elkins Dam Site. Public access is listed as yes.
Can I fish at Pleasant Lake-Outlet?
- Pleasant Lake-Outlet has 1 documented boat landing in the USGS National Boat Ramps inventory. 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.
Explore Pleasant Lake-Outlet across LakeQuality
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Where this data comes from
15 measurements from 1 monitoring station, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- New Hampshire Department Of Environmental Services (BEACH)
1111330015 samples · 2020–2024
Analytical methods
- Phosphorus by Two Reagent Colorimetry
- 10-115-01-1 F ~ LACHAT; Total Phosphorus- Manual persulfate digest
- 2130 B ~ Nephelometric Method
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
Named boat-access points from the USGS National Boat Ramps inventory