Michigan Lake Plain

Three river reaches in HUC 040500020102, 040500020210, and 040500020211 are designated as impaired under Clean Water Act section 303(d) with active Total Maximum Daily Load plans, updated in the 2026 assessment cycle. Impairment causes are not detailed in the state's latest submission, but cleanup targets and timelines are established.

September 2026 precipitation in Van Buren County totaled 5.3 inches, 1.6 inches above the 1901-2000 normal of 3.6 inches, ranking 22nd wettest of 132 Septembers on record. This substantial wetness follows an August in which abnormal dryness affected a fraction of the county, bringing relief that has held through October.

South Branch Black River near Bangor, Michigan recorded a streamflow of 79.1 cubic feet per second and gage height of 3.6 feet on 2026-10-22. The recent above-normal precipitation in the watershed supports flow at moderate levels as autumn flows typically decline.

Van Buren County held no drought classification for the week of 2026-10-20 to 2026-10-26, after anomalous dryness (0.73% of the county in the abnormally dry category) through mid-September. Above-normal precipitation in late September and early October has ended the dry spell.

Autumn olive was recorded on September 26, 2026 in Bangor Township, Michigan. This introduced nitrogen-fixing shrub from eastern Asia establishes vigorously in infertile soils and can suppress native understory vegetation, now present in the Michigan Lake Plain area.

European alder was observed on September 27, 2026 in Grand Junction, Michigan. Alnus glutinosa is an introduced species from northern Europe now recorded in the Michigan Lake Plain area, potentially competing with native alder species for wetland habitat.

Flat-top white aster was observed flowering on October 13, 2026 in Arlington Township, Michigan, with additional sightings through mid-October. The species is in its natural fall bloom window. Mean daily temperatures over the past 30 days were 1.4°F above normal, and October 2025 ranked 19th warmest on the 131-year county record, supporting early or prolonged blooming in the aster family.

A Short-eared Owl was recorded at Allegan SGA--Farm Unit on 2026-10-19. This state-Endangered species is beginning its autumn migration through Michigan grasslands and marshes, moving from breeding grounds in Canada toward wintering grounds in the south. Their presence signals the start of migration season in open country habitats.

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.