Sucker Brook Lake
Merrimack County, New Hampshire210 acresView mapDirections
NHDES publishes the water-quality measurements for Sucker Brook Lake. Here is what has been measured.
- Mesotrophic
- Impaired · Mercury
- Public access
- Limited data
Sucker Brook Lake in Merrimack County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 18.6 µg/L. Surface area: 210 acres.
Sucker Brook Lake is a 210-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, Sucker Brook Lake ranks #41 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-09-30. 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. Sucker Brook Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, nuisance exotic species, pH / acidity. Check local advisories before you swim.
Whether Sucker Brook Lake 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 Sucker Brook Lake
These are the measurements NHDES publishes for Sucker Brook Lake, 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 18.6 µg/L. TSI 46.
| 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 | 18.6µg/L | Fair 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. | 46 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Sucker Brook Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
210 acres
Public access
Yes
Listed by NHDES
No bathymetric survey has been published for Sucker Brook Lake, so its depth is not documented here.
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Fishing Sucker Brook Lake
Reservoir Info (USACE NID)
Sucker Brook Lake is a man-made reservoir impounded by the Highland Lake Dam (completed 1935), built primarily for recreation on the Tr Sucker Brook; earth-type dam, 10 ft tall and 180 ft long.
- Surface area
- 210 ac
- Normal storage
- 440 ac-ft
- Max storage
- 1,050 ac-ft
- Drainage area
- 5.02 sq mi
- Hazard class
- Significant
- Owner
- TOWN OF ANDOVER
Source: USACE National Inventory of Dams, NID ID NH00035 · Operator website · Matched by proximity (0.03 km)
EPA Impairment Status
Sucker Brook Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Aquatic life, Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHLAK700010804-01-01 · Official waterbody report
Nearby Lakes in Merrimack County
Frequently asked questions about Sucker Brook Lake
Where is Sucker Brook Lake?
- Sucker Brook Lake 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 Sucker Brook Lake?
- Sucker Brook Lake in Merrimack County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 18.6 µg/L. Surface area: 210 acres.
Is Sucker Brook Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Sucker Brook Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, nuisance exotic species, pH / acidity. Check local advisories before you swim.
Can I fish at Sucker Brook Lake?
- Public access to Sucker Brook Lake 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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Where this data comes from
6 measurements from 1 monitoring station, 2023–2024. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- New Hampshire Department Of Environmental Services (BEACH)
111133006 samples · 2023–2024
Analytical methods
- 10-115-01-1 F ~ LACHAT; Total Phosphorus- Manual persulfate digest
- Turbidity by Nephelometry
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