Grass Lake

Grass Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Ramsey County. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

A TSI near 42 places Grass Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. The lake's surface area is not consistently recorded across state datasets — physical context remains partial. Grass Lake ranks 1 of 49 in Ramsey County, putting it in the upper tier of locally monitored lakes.

No invasive species are currently listed at Grass Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Grass Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Grass Lake — most use is by shoreline residents and their guests. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.