Rivalry Lake

On the LakeGrade scale Rivalry Lake grades a B, with clarity at 10.0 ft and phosphorus readings still being added placing it above the Minnesota median.

A TSI near 44 places Rivalry Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. The lake's 100 ft maximum depth is in the upper tier for Minnesota — deep enough for cold-water fish to find refuge in summer. Rivalry Lake covers 153 acres alongside 4.3 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Within Lake County's 142 graded lakes, Rivalry Lake ranks 76 — below the local median, though not at the bottom.

Rivalry Lake has no invasive species recorded in Minnesota state databases as of 2023, though prevention practices still apply at all access points. The fishery includes walleye among the lake's 7 documented species — a notable draw for Minnesota anglers. 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.