Grass Lake

Grass Lake earns an A — every scored parameter (phosphorus) rates among the best monitored waters in Ramsey County.

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. Within Ramsey County's 49 graded waters, Grass Lake sits at rank 1, near the top of the local distribution.

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. The lake lacks a documented public access point, so visitor use is limited. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.