Sucker Brook Lake
Sucker Brook Lake in Merrimack County, New Hampshire has a water quality grade of C (Fair). Phosphorus: 18.6 µg/L. Surface area: 210 acres.
- Area
- 210 acres
- Type
- Mesotrophic
- Public access
- Yes
Sucker Brook Lake is a 210-acre mesotrophic lake in Merrimack County, New Hampshire. Water quality is graded C based on 1 sampling years through 2024. Limited fish-species data available. Public access is available with 1 public boat landing. 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. Grade methodology: LakeGrade methodology.
Watch Sucker Brook Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
No clarity data. Phosphorus level: 18.6 µg/L. Trophic State Index: 46.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 18.6 µg/L | Fair |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Sucker Brook Lake
Compare lakeside cabins, hotels, and vacation rentals near Sucker Brook Lake in Merrimack 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 Sucker Brook Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 210 acres |
| Public Access | Yes |
No bathymetric survey has been published for Sucker Brook Lake, so its depth is not documented here.
Recreation & Access
- Highland LakePublic
Named access points from the USGS National Boat Ramps inventory, snapped within 5 km. More lakes with boat ramps
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
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHLAK700010804-01-02 · Official waterbody report · Matched by proximity (0.74 km)
County Ranking
Ranked #41 of 41 lakes in Merrimack County
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. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Sucker Brook Lake?
- Sucker Brook Lake in Merrimack County, New Hampshire has a water quality grade of C (Fair). Phosphorus: 18.6 µg/L. Surface area: 210 acres.
Is Sucker Brook Lake safe to swim in?
- Generally safe for swimming, moderate water quality. Sucker Brook Lake has a water quality grade of C (Fair). Always check local health department advisories before swimming.
Are there boat ramps on Sucker Brook Lake?
- Sucker Brook Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Highland Lake. Public access is listed as yes.
Explore Sucker Brook Lake across LakeGrade
More New Hampshire Lake Rankings
Top 25 by overall water quality score
Top 25 by Secchi water clarity
Grade A/B + low algae filter
Panfish-rich, public access
Full state directory
Other Grade C Lakes in New Hampshire
Mesotrophic Lakes in New Hampshire
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)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Named boat-access points from the USGS National Boat Ramps inventory