Green Mountain Foothills

Flow in the system feeding Halfmoon Lake dropped to 164 cubic feet per second last week — less than half the rate from just three weeks earlier. For a lake already listed as impaired since 2022 with no remediation plan in place, that timing is precarious.July is when most temperate lakes stratify, separating into warm and cold layers that trap oxygen-hungry bacteria in the murky depths. As that sealed layer consumes the last dissolved oxygen, the window for any recovery narrows sharply. Low inflow during stratification season means less dilution of whatever excess nutrients or contaminants are already in the system — and the impairment cycle tightens.Flow did recover to 320 cfs by mid-July, which helps. Yet the broader picture remains unsettled: the watershed drains 38 facilities with significant discharge violations, many of which remain unresolved. For a lake waiting five years for a cleanup plan, every low-flow spell is a test the ecosystem barely passes.

Streamflow has collapsed to a summer low in just three weeks—a Brook Trout catastrophe in the making. Shallow riffles warm quickly without flow, and fish must abandon feeding grounds for cold spring-fed refuges or die of thermal stress. The lucky ones cluster in pockets of groundwater seepage; the rest perish.Each drought summer compounds the last. Young fish that should be recruiting to the population fail to survive the gauntlet. Over successive years, this reshapes the age structure of the population, leaving fewer year-classes to bridge the winters ahead. What appears as a single dry season is really a ratchet: each pulse tightens the screws on a population already running close to the edge.

Four genera of mayflies are at peak emergence this week—a brief window when the river itself is in crisis. Flow has dropped nearly half in just seven days, from 738 to 383 cubic feet per second, shrinking channels at the very moment when Siphlonurus and Maccaffertium are transforming from nymphs into adults. The larvae are compressed into shallower pockets; the trout, herons, and swallows that have timed their whole season to this abundance face a feast that is suddenly difficult to reach.Two tributaries feeding this main channel are already impaired, and the stress of drought-driven low flow will compound that degradation. The mismatch between this ecological window and the water's retreat is a reminder that even synchronized systems can unravel when climate and hydrology shift out of phase.

Spongy moths were active across the region in late June, their adults emerging as sugar maples reached full canopy — seven sightings from lower elevations near the bay up into the higher valleys. The timing is ominous: these trees are now entering a critical window of vulnerability.Streamflow dropped sharply during the same period, falling from 858 cubic feet per second to 467 in just two weeks. The combination of fresh defoliation and acute water stress is what transforms a single outbreak year from a cosmetic injury into ecological debt. A healthy maple can usually absorb one year of heavy caterpillar feeding, but weakened trees — starved of water, their reserve carbohydrates already mobilized for leaf replacement — lose that resilience.This is how cumulative stress builds. Each stressor alone might be survivable; together, they erode the margin between endurance and decline. These maples will likely persist through this season, but the next drought, or the next outbreak, may tip the balance.

Listen for a sound like two stones knocked together, a rapid kik-kik-kik-kik that drops off at the end. That is the Virginia rail, calling from somewhere in the cattails and sedges at the wetland edge near Cambridge Village. You probably will not see it. That is characteristic of this bird. The rail moves through dense emergent vegetation with a laterally compressed body built for exactly this kind of travel, slipping between stems that would stop a larger bird entirely. The call is the main evidence of its presence, and right now, in early summer, it is calling often.The Virginia rail is a small, rust-breasted wading bird, roughly the size of a robin but longer-legged and longer-billed, with a bill that curves slightly downward and works well for probing soft substrate. It is not a rare species across its range, but here in northern Vermont it sits near the upper edge of where it regularly breeds, and a nesting bird at this latitude is notable enough that local observers document it carefully. The wetland margins near Cambridge Village offer what it needs: shallow water with emergent vegetation, soft mud, and the aquatic insect emergence that peaks in early summer. The rail forages by wading slowly through the shallows, picking invertebrates from the water surface and probing into mud for worms, beetles, and small snails. It also takes aquatic insects, and the timing of its breeding season aligns with the period when those insects are most available.Nesting happens low in the marsh, with the cup of woven plant material built just above the waterline, often anchored to standing stems of sedge or cattail. Star sedge grows in patches through the wet margins here, and northern blue flag is in bloom along the shallower edges, its purple flowers visible above the water. Both provide the structural cover the rail depends on. The female lays somewhere between six and thirteen eggs, and both parents incubate. The chicks are precocial, covered in black down at hatching, and able to leave the nest within days, though they stay close to the adults and are fed by them for several weeks. During this period, the adults are particularly vocal, and the grunting pig-like call the rail also produces, lower and more conversational than the kik call, is a way of keeping the family group in contact through vegetation that makes visual contact nearly impossible.The wetland that supports the rail is also working for other species right now. American toads are finishing their breeding season in the shallower pools. Common garter snakes move through the wet margins, hunting the same invertebrates and small amphibians the rail takes. Barn swallows are hunting insects over open water nearby, taking the same emergence from the air that the rail takes from below. Common yellowthroats are singing from the shrubby edges, and song sparrows are nesting in the transition zone between wet and dry ground. The rail occupies a specific position in all this: the interior of the marsh, the densest and wettest part, which most other birds avoid. Tufted vetch, an invasive plant, has established along some of the drier margins here, and while it does not reach into the rail's core habitat, it competes with native plants in the transition zones that buffer the wetland from surrounding land.If you stand at the edge of the marsh now, the light in early summer is long and the vegetation is at full height. The green false hellebore stands tall in the wet areas, its broad pleated leaves catching the afternoon light. The air over the water smells of wet soil and plant matter, the particular smell of a marsh in full production. Somewhere in the cattails, closer than you might expect, the rail is moving. The kik-kik-kik starts up again, and then stops.

The air above Cambridge Village holds a different quality in these longest days of early summer. Light stretches thin and golden through the canopy, and somewhere in that brightness, a ruby-throated hummingbird hovers at the edge of a wetland clearing. The sound arrives before the sight: a soft thrumming that cuts through the morning stillness, then stops as suddenly as it began.Ruby-throated hummingbirds have been crossing the Gulf of Mexico and moving north through Vermont for weeks now, their timing calibrated to the opening of flowers. The males arrive first, claiming territories along streams and forest edges where nectar sources concentrate. Here near the village, they find what they need most: the bright yellow blooms of Great St. John's wort rising from wet meadow edges. These native wildflowers open their four-petaled faces just as the hummingbirds settle into breeding territories, each bloom offering a shallow cup of nectar accessible to a needle-thin bill.Great St. John's wort grows in the margins between forest and wetland, its stems reaching waist-high and crowned with clusters of yellow flowers that seem to glow against the green backdrop. Each flower opens for just a day or two, but the plant produces new blooms in sequence through the early summer weeks. This steady progression of fresh nectar coincides with the hummingbirds' most energy-intensive period: establishing territories, building nests, and feeding young. A single plant might host dozens of visits from the same bird over several days as it works through the flower clusters from bottom to top.The hummingbird's approach to each bloom follows the same precise pattern. It hovers six inches away, assessing the flower's freshness by sight, then darts forward to probe the shallow nectary at the base of the petals. The visit lasts three seconds, maybe four. Its bill reaches past the prominent yellow stamens to find the sweet liquid that fuels its hyperactive metabolism. Between flowers, it perches on a thin branch or dead stem, scanning for competitors and listening for the calls of its mate from the nest hidden in the fork of a nearby maple.This synchrony between bird and flower represents more than convenient timing. The Great St. John's wort benefits from the hummingbird's visits, though not in the way most flowering plants do. Hummingbirds carry little pollen on their smooth bills and feathers, but their presence at the flowers attracts other pollinators. Bees and small flies, drawn by the movement and activity around the blooms, arrive to find fresh pollen and nectar. The hummingbird's feeding creates a beacon that signals flower quality to insects better equipped for pollination.As you listen for that distinctive wing-beat somewhere above, notice how the light filters differently now in these peak summer days. The canopy has thickened since spring, creating a mosaic of bright clearings and deep shade. In the wetland edges where the St. John's wort blooms, that golden morning light catches the yellow petals and holds them like small lanterns against the darker water beyond.

The forest floor in Underhill holds its breath between seasons. Above, sugar maple leaves stretch wide in their first full green, but below, where filtered light barely reaches the leaf litter, only the earliest flowers dare to open. Here, among the emerging jack in the pulpit and scattered violets, red trillium lifts its three-petaled bloom just inches above its whorl of leaves.The flower opens dark red, almost burgundy, with a scent that stops you short if you lean close. This is not the sweetness that draws bees and butterflies. Red trillium calls to different visitors entirely. The odor carries notes of decay, faint but unmistakable, designed for creatures that make their living among fallen logs and decomposing matter. Fungus gnats rise from the damp soil nearby. Small carrion flies, barely visible unless they catch the light, arrive throughout the day. They come because the flower speaks their language.These tiny flies, many no larger than a pinhead, navigate by scent toward what they hope might be rotting flesh or fermenting fungi. Instead they find red trillium's deception. The flower offers no carrion, but it provides something else the flies need: pollen rich in proteins. As they crawl across the stamens, yellow pollen grains stick to their bodies and legs. When they visit the next trillium, drawn by the same false promise of decay, they brush pollen onto the waiting stigma. The flower has turned the flies' search for death into a delivery of new life. This partnership plays out across the understory, where few other blooms compete for attention. While most wildflowers wait for warmer days and more abundant pollinators, red trillium blooms early and alone, claiming the exclusive attention of flies that emerge with the first consistent warmth.The exchange happens quietly, without the obvious drama of bees working apple blossoms or hummingbirds at cardinal flower. You might walk past a dozen red trilliums and never notice the tiny flies at work. But if you crouch low and watch one flower for several minutes, you will see them. A fungus gnat lands, walks deliberately across the petals, then disappears into the forest duff. Another arrives from a different direction. The flower's strategy unfolds in small, patient movements. Each visit builds toward the fruit that will form by midsummer, heavy with seeds that ants will eventually carry to new ground. Right now, though, the work is simpler. Somewhere near your feet, if you are walking these woods, another red trillium opens its dark petals to the filtered light, releasing its strange perfume into the still air between the trees.