Johnson Lake

On the LakeGrade scale Johnson Lake grades a B, with clarity at 11.5 ft and phosphorus readings still being added placing it above the Minnesota median.

Mesotrophic conditions dominate at Johnson Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. A maximum depth of 24 ft puts Johnson Lake in the middle of Minnesota's depth distribution. At 36 acres, Johnson Lake sits below the Minnesota median: a small water where shoreline activity has an outsized effect on water quality. Johnson Lake ranks 47 of 142 in Lake County — solidly in the upper half of the local distribution.

No invasive species are currently listed at Johnson Lake — the lake remains off the Minnesota infested-waters roster. The fishery includes walleye among the lake's 4 documented species — a notable draw for Minnesota anglers. No formal public access is documented at Johnson Lake — most use is by shoreline residents and their guests. The lake has a long ice-out record — 51 observations on file, with a median ice-out around May 2. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.