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LakeQuality
Late afternoon sun over Slim Lake, scattering a bright path across wind-textured water
NR

McHenry County Lake Quality

North Dakota, 32 lakes — no lake here has enough monitoring data for a grade

There are 32 monitored lakes in McHenry County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. No lake in McHenry County has enough sampling behind it for an A–F grade yet. The 32 monitored lakes below carry whatever clarity, phosphorus, and chlorophyll-a measurements exist.

Most of the county's monitored lakes are shallow, under 50 feet, which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed.

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Where to stay near McHenry County

Top-rated places to stay near McHenry County

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Quick Answers for McHenry County

Cleanest lakes in McHenry County →Cleanest lakes in North Dakota →Safest swimming lakes in North Dakota →

Planning a trip? Check special fishing regulations for Round Lake — or check the official North Dakota fishing regulations.

All Lakes in McHenry County

32 lakes · 0 graded, 32 not rated0 graded lakes · 32 not rated, hidden

#LakeGradeClarityPhosphorusAlgaeTrophicAccess
NRRound LakeMcHenryNR12.1 ftNo recent samples2.4 µg/LNo recent samplesNot recorded
NRLake GeorgeMcHenryNR2.5 ftNo recent samples7.4 µg/LNo recent samples✓ Public
NRBuffalo Lodge LakeMcHenryNR3 ftNo recent samples2.6 µg/LNo recent samples✓ Public
NRGoose LakeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRNorth LakeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRock LakeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCarvers LakeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NROslie LakeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRNead LakeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRStink LakeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake HesterMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPotters LakeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRErickson LakeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCottonwood LakeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRConnia SloughMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBentley LakeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRAlkali LakeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSteele LakeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRFresh Water LakeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSmoky LakeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRFlat LakeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRutten LakeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMartin LakeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBromley LakeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake LemerMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLong LakeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDuckshire LakeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake GeorgeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHerrington LakeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRStevens SloughMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHeffner LakeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSpring LakeMcHenryNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded

NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.

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Other Counties in North Dakota

Rolette County

80 lakes · Avg grade B

Renville County

2 lakes · Avg grade B

Bottineau County

47 lakes · Avg grade B

Benson County

31 lakes · Avg grade B

McLean County

43 lakes · Avg grade B

Barnes County

22 lakes · Avg grade C

See how McHenry County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..

Source: EPA National Aquatic Resource Surveys, 2026.