Martin Lake

Martin Lake earns a D — measurements through 2024 show persistent nutrient pressure that limits clarity through the summer. Secchi readings are the weakest of the three parameters, suggesting suspended sediment or algal biomass dominates the optical signal.

At a TSI of 63, Martin Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. A maximum depth of 20 ft puts Martin Lake in the middle of Minnesota's depth distribution. The lake's 232 acres and 3.2 miles of shoreline put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. Martin Lake sits at rank 17 of 24 in Anoka County, in the lower half of the local distribution.

Martin Lake has no invasive species recorded in Minnesota state databases as of 2024, though prevention practices still apply at all access points. The fishery includes walleye alongside the lake's other 13 documented species — a notable draw for Minnesota anglers. Public access is available — the lake is on the Minnesota PCA public-access list. Ice-out has been logged at Martin Lake more than two dozen times, putting the median around Apr 8 — a useful baseline for tracking climate trends. Multiple sampling years from Minnesota PCA volunteers and partner agencies back the grade, so the letter should hold steady absent a major watershed shift.