Knights Meadow Marsh Reservoir
Merrimack County, New Hampshire45 acresView mapDirections
No nutrient or algae sampling on record from NHDES for this lake.
- Impaired · Mercury
Knights Meadow Marsh Reservoir in Merrimack County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Surface area: 45 acres.
Knights Meadow Marsh Reservoir is a 45-acre lake in Merrimack County, New Hampshire.
Source: EPA Water Quality Portal sampling records, your state environmental agency. Methodology: how these readings are compared.
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Knights Meadow Marsh Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Knights Meadow Marsh Reservoir 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 Knights Meadow Marsh Reservoir
These are the measurements NHDES publishes for Knights Meadow Marsh Reservoir, 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 Knights Meadow Marsh Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
45 acres
Shoreline
1.6 mi
No bathymetric survey has been published for Knights Meadow Marsh Reservoir, so its depth is not documented here.
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Fishing Knights Meadow Marsh Reservoir
EPA Impairment Status
Knights Meadow Marsh Reservoir 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: Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHIMP700030304-02 · Official waterbody report
Nearby Lakes in Merrimack County
Frequently asked questions about Knights Meadow Marsh Reservoir
Where is Knights Meadow Marsh Reservoir?
- Knights Meadow Marsh Reservoir 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 Knights Meadow Marsh Reservoir?
- Knights Meadow Marsh Reservoir in Merrimack County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Surface area: 45 acres.
Is Knights Meadow Marsh Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Knights Meadow Marsh Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
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Where this data comes from
Measurements for Knights Meadow Marsh Reservoir 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