Griggs County Lake Quality

Only 2 lakes in Griggs County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. Griggs County averages to a C. The distribution behind that average matters more than the letter: a few stressed lakes versus many decent ones can produce the same average as the inverse.

The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Carlson-Tande Dam Lake (C); the most-stressed is Carlson-Tande Dam Lake (C).