Hopkinton Lake
Merrimack County, New Hampshire466 acresView mapDirections
No nutrient or algae sampling on record from NHDES for this lake.
- Impaired · Biotoxins
- 9 ft max depth
- Public access
Hopkinton Lake in Merrimack County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 9 ft. Surface area: 466 acres.
Hopkinton Lake is a 466-acre lake in Merrimack County, New Hampshire with a maximum depth of 9 feet. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, your state environmental agency. Methodology: how these readings are compared.
What Hopkinton Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Camping1 public campground nearby
Swimming conditions
No readingBacteria advisory
Nutrient and algae readings are not a swimming clearance. Hopkinton Lake is listed impaired under Clean Water Act §303(d) (IR 5) for biotoxins, mercury, nuisance exotic species. Check local advisories before you swim.
Whether Hopkinton 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 Hopkinton Lake
These are the measurements NHDES publishes for Hopkinton 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. TSI undefined.
Ask about Hopkinton Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
9 ft
Surface area
466 acres
Shoreline
11.2 mi
Public access
Yes
Listed by NHDES
The depth above comes from a bathymetric survey of this lake, not from a regional estimate.
Recreation & Access
- StumpfieldPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Public campgrounds near Hopkinton Lake
- Elm Brook Park Rec Area1.6 kmReserve
Nearest public campgrounds in the USGS National Map inventory, within about 3 miles. An empty list means USGS records no campground that close, which is not the same as camping being unavailable. Where the source gives an official reservation link, it is used; the cabin and hotel search does not cover campsites. More camping lakes
Stays via Stay22
Stays near Hopkinton Lake
Compare lakeside cabins, hotels, and vacation rentals near Hopkinton 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 Hopkinton Lake
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Fishing Hopkinton Lake
EPA Impairment Status
Hopkinton Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life, Fish consumption, Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHIMP700030503-01-01 · Official waterbody report
Nearby Lakes in Merrimack County
Frequently asked questions about Hopkinton Lake
Where is Hopkinton Lake?
- Hopkinton 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 Hopkinton Lake?
- Hopkinton Lake in Merrimack County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 9 ft. Surface area: 466 acres.
Is Hopkinton Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Hopkinton Lake is listed impaired under Clean Water Act §303(d) (IR 5) for biotoxins, mercury, nuisance exotic species. Check local advisories before you swim.
How deep is Hopkinton Lake?
- Hopkinton Lake has a maximum depth of 9 feet. The lake covers 466 acres.
Are there boat ramps on Hopkinton Lake?
- Hopkinton Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Stumpfield. Public access is listed as yes.
Can I fish at Hopkinton Lake?
- Hopkinton Lake 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.
Are there campgrounds on Hopkinton Lake?
- Hopkinton Lake has 1 public campground from USGS The National Map within 5 km, including Elm Brook Park Rec Area. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.
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Where this data comes from
Measurements for Hopkinton Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Named boat-access points from the USGS National Boat Ramps inventory
Public campgrounds from USGS The National Map Structures, within about 3 miles