Boulder Lake

Boulder Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season.

Mesotrophic conditions dominate at Boulder Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. 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. Boulder Lake ranks 52 of 142 in Lake County — solidly in the upper half of the local distribution.

No invasive species are currently listed at Boulder Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Boulder 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.