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

Dewey County Lake Quality

South Dakota, 11 lakes, measured by SD DANR

Dewey County holds 11 monitored lakes. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. The 11 monitored lakes in Dewey County carry whatever clarity, phosphorus, and chlorophyll-a readings SD DANR has published, shown as reported.

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 Dewey County

Top-rated places to stay near Dewey County

Prices for Oct 30–Nov 1, 4 adults. Change dates on the map below.

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Quick Answers for Dewey County

Cleanest lakes in Dewey County →Best swimming lakes in South Dakota →

Planning a trip? Check special fishing regulations for Little Moreau Lake — or check the official South Dakota fishing regulations.

All Lakes in Dewey County

11 lakes · 0 ranked on readings, 11 without enough sampling0 lakes ranked on readings · 11 without enough sampling, hidden

#LakeClarityPhosphorusAlgaeTrophicAccess
Little Moreau LakeDeweyNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Livermant LakeDeweyNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Horseshoe LakeDeweyNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Peach LakeDeweyNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Whitehorse LakeDeweyNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Goose Creek DamDeweyNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Isabel LakeDeweyNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Timber LakeDeweyNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Timber LakeDeweyNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lantry LakeDeweyNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Eagle Butte LakeDeweyNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public

NR = no nutrient or algae reading on record. The measurements are published as the authority reports them. Where the data comes from.

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Other Counties in South Dakota

Pennington County

2 lakes

Roberts County

20 lakes

Hughes County

2 lakes

Charles Mix County

8 lakes

Walworth County

4 lakes

Sully County

9 lakes

Browse every South Dakota lake, or the full directory of lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..

Source: the South Dakota Department of Agriculture and Natural Resources. See data sources.