Michigan Lake Plain

Northern Leopard Frog was recorded on 2026-09-16 in Hagar Township, a federally threatened species. Leopard frogs depend on shallow wetlands that hold water seasonally, and fall surveys often coincide with movement away from breeding sites toward overwintering habitat. The species is sensitive to habitat loss and wetland degradation.

Wood Frog was recorded on 2026-09-20 in South Haven, the most recent vertebrate sighting in the past 30 days. Wood frogs breed in vernal pools in spring and summer, then disperse in fall to overwinter in forested areas. Late September sightings track their movement toward winter habitat in leaf litter and woodland refugia.

Pitcher's thistle was observed on August 17, 2026 in Van Buren County. This federally threatened species occurs on sand dune shorelines; its presence here indicates the specialized dune habitat persists at this site. The threatened status means this population warrants particular attention.

White snakeroot was observed flowering on September 17, 2026 in Lawton, Michigan. The species is in its natural late-summer and fall bloom window, which aligns with its phenology; recent weeks were warmer than normal, with mean daily highs 1.4°F above the 1991-2020 normal.

Month-to-date precipitation through September 21 was 1.2 inches, 1.1 inches below normal. The preceding 30 days were also warmer than normal, with mean daily lows 3.8°F above the seasonal baseline. This combination of heat and dryness may stress late-summer flowering plants and seed maturation.

A Scarlet Tanager was recorded on 2026-09-20. These long-distance migrants breed in eastern hardwood forests and depart for South America in late August through October, with peak passages in mid-late September when insects remain available for refueling before their trans-Gulf crossing.

The Preserve at Woodland Harbor development in South Haven has simply stopped reporting. Its Clean Water Act discharge permit requires regular monitoring reports on what the facility releases into the watershed, and none have been filed, landing it in significant non-compliance for failure to report rather than for any measured exceedance. That distinction matters: there is no pollutant data to read as good or bad here, because none exists. Nearby, the Port of Call West mobile home community is also in significant non-compliance, now more than 30 days overdue on a required compliance schedule. A third local operator, South Haven Finishing, went through a similar violation and has since resolved it, so the regulatory system does eventually catch up with operators. That track record only makes the two currently open cases stand out more. The gap in reporting is compounded by a gap in independent monitoring. The closest stream gauge, on the South Branch Black River near Bangor, has logged only one reading in the past two weeks, not enough to say whether flow or gage height are running normal for mid-August. That leaves no real way, from the permit holders or from the river itself, to know what conditions look like downstream of this development. The regional impaired-waters list shows nothing newly flagged in this stretch, which offers some reassurance, but it is no substitute for the missing data.

The second brood of the Karner Blue is on the wing in the oak savanna and barrens northeast of here, the last kind of habitat this small, federally threatened butterfly can survive in at all. Its caterpillars feed on nothing but wild lupine, and that plant in turn needs the open, sandy, fire-maintained savanna conditions that have dwindled to scattered fragments across the lake plain and the wider Great Lakes region since the mid-1900s. Because the butterfly has no other host plant to fall back on, whether a second brood shows up in a given July is about as clean a check as exists on whether a remnant patch of savanna is still functioning. This July brought a noticeably heavier showing than last year: 12 confirmed sightings between July 1 and 18, against 5 in the same window in 2025. Spring-brood timing barely moved between the two years, both flying in late May, so the difference sits specifically with the summer flight rather than a broader shift in when the species is active this year. That said, nine of the twelve records came in on a single day, July 11, with the remainder trailing in over the following week. That clustering looks like a coordinated survey visit to a known site rather than a dozen separate walkers stumbling onto butterflies independently. Community science tallies like these track observer effort as much as insect numbers, so the honest reading is that the second brood emerged and was found in good numbers this year, not that the underlying Karner Blue population has grown.

Hartford wastewater treatment plant has exceeded its permitted mercury discharge limit in every reporting quarter for at least the past year, with a fresh exceedance recorded just days ago. That alone would be a serious regulatory failure — but the timing sharpens the concern considerably. Stream flow has fallen to just 35 cubic feet per second, the lowest it has been in weeks, stripping the water column of the dilution capacity that, under better conditions, at least partially buffers what comes through that discharge pipe. The chemistry of low-flow, warm-water conditions turns mercury from a chronic problem into an acute one. When water moves slowly through sediment-laden reaches, anaerobic bacteria convert inorganic mercury into methylmercury — the organic, bioavailable form that accumulates in tissue rather than flushing through. Methylmercury biomagnifies with extraordinary efficiency, concentrating by a factor of roughly one million from water to top predators. Herons, kingfishers, and the people who eat fish from these waters sit at the end of that chain. The conditions for methylation — warm temperatures, low dissolved oxygen, sluggish flow, fine sediments — are precisely what a midsummer low-flow event delivers. Odonates along the stream corridor right now include American Rubyspot (Hetaerina americana) and Ebony Jewelwing (Calopteryx maculata), both of which are meaningful here. These are stream-dependent damselflies whose larvae require clean, well-oxygenated water with intact riffle structure — they are routinely used as biological indicators in water-quality assessments, and their presence in reasonable numbers signals that the stream hasn't yet crossed into gross degradation. But biological indicators reflect the past, not the present. A larval cohort that hatched before the current discharge pattern intensified may be producing adults we're watching now — their flight doesn't clear the water of what's accumulating in the sediment beneath them. The broader odonate assemblage here — diverse, apparently healthy — sits in an ecological region with a complicated industrial and agricultural history. The Michigan Lake Plain has had its stream systems drained, tiled, and channelized for more than a century, and the stretches that still support sensitive odonates represent a fraction of what existed before European settlement. That context matters: when we read a community of jewelwings and rubyspots as a sign of health, we are reading it against an already-diminished baseline. The margin for additional stress is not what it would appear to be if the system were intact. Mercury's long residence time in sediment means that exceedances don't reset at the end of a quarter — each pulse deposits a legacy that persists through seasons and into years. As late-summer flows remain low and temperatures stay elevated, the window for active methylation stays open. The odonates are still here, still flying, still completing a life cycle that threads through the water and the air above it. The question the regulatory record raises is not whether the system is healthy today, but whether it can absorb one more year of quarterly exceedances without the biotic signal catching up to the chemical one.

Stream flow has dropped to 60 cubic feet per second — a ninety-fold decline from the 460 cubic feet per second recorded just weeks ago. At such austere levels, the chemistry of the water shifts. Mercury, which lingers in sediment and driftwood, begins to methylate: bacteria convert it into an organic form that fish absorb readily, concentrating as it moves up the food chain to herons and other predators. During this vulnerable season, the treatment plant has exceeded its mercury permit limit for four consecutive quarters, with nineteen percent over the threshold in the most recent month alone. The prior three quarters show a troubling pattern: exceedances of 16, 27, and 38 percent. Nearby stream reaches are federally listed as impaired — a designation that reflects precisely this kind of cumulative stress, where low flow amplifies the toxicity of discharges that might be manageable at higher water levels.