Gulf of Maine Coastal Plain

July 21: a summer low-flow day, when a river's power to dilute what enters it shrinks to its annual minimum. The same discharge that passes largely unnoticed in April's high water becomes, in midsummer heat, a far larger and more visible share of total river volume. Right now, across the Gulf of Maine Coastal Plain, fifty-two facilities are in significant non-compliance with their Clean Water Act discharge permits — and the timing could hardly be worse. The violators include gravel operations like Plourde Sand & Gravel, food processors such as BrightFarms, industrial manufacturers, and wastewater treatment plants — including the Manchester and Nashua facilities on the Merrimack — spread across the watershed.All fifty water bodies formally assessed within the region already carry impairment designations; not one meets its designated water quality standards. The Clean Water Act was built around exactly this seasonal dynamic — the recognition that summer low flows demand stricter compliance. But a violation record this broad, at this moment of peak vulnerability, suggests that the law's protective intent and its enforcement reality have drifted far apart.

Freshwater pearl mussels (Margaritifera margaritifera) are among the longest-lived freshwater animals — individuals routinely survive more than a century in suitable streams. But they cannot reproduce without a specific host: Atlantic salmon, whose gills the mussel larvae parasitize briefly before dropping to the streambed as juveniles. In New Hampshire, salmon are functionally absent, their native runs extirpated decades ago.A single threatened mussel found in Weare this May likely represents the last gasp of a relict population. Without salmon to continue the cycle, the remaining individuals can only age. When they die, no recruits will replace them — a slow fade into local extinction.The broader crisis is visible in the numbers: every assessed water body in the region is now impaired, and streamflow has collapsed. A peak of 1,300 cubic feet per second dropped to 99 in a single week — a thirteenfold decline that leaves already-stressed mussel beds entirely exposed. For a species whose survival is measured in geological time, such rapid environmental shifts allow no adaptation.

Giant Mayflies (Hexagenia limbata) reached their emergence peak this week, with 44 sightings logged across a seventy-mile stretch from Goffstown to Holderness on July 4 and 5. The timing is significant: these mayflies spend three years developing in stream sediment as burrowing nymphs, so their presence now signals that bottom oxygen levels have held steady enough to sustain a full aquatic life cycle.Yet their emergence is a partial reprieve, not vindication. Within ten miles of the observation zone, fifty water bodies remain classified as impaired, and none is currently designated as fully supporting its intended uses. The giant mayflies are thriving where conditions permit — but the broader watershed is still struggling. Their success is a canary surviving in a cage, not a cage growing safer.

Twelve dragonfly species were active along local streams and ponds in June, a diverse emergence that speaks to refugia—pockets of habitat that remain viable despite the broader regulatory picture. Most striking was a Common Sanddragon (Gomphus vulgatissimus) on the Soucook River on June 20. The larvae of this species are exacting indicators—they require clean water and adequate dissolved oxygen to complete their development.Yet here is the paradox: all 50 water bodies assessed in the region are officially listed as impaired. The dragonfly's presence proves that some reaches are holding enough quality to support odonate recruitment, even as regulatory classifications suggest comprehensive degradation. It is a reminder that biological reality and regulatory categories do not always align—and that landscape-scale impairment can mask the fine-grained ecological work still happening in the margins.

Streamflow surged nearly 25-fold in two weeks, with the gauge jumping from a low of 157 cubic feet per second to 3,970 at peak—a gage height swing from 2.82 to 6.77 feet. The timing collided with mayfly emergence, when immature insects are most vulnerable to violent scouring. In a healthy watershed, such pulses are vital disturbance—renewal, migration cue, nutrient transport—but here the flood pulse simply moves the problem downstream.The water quality records tell the underlying story. Every assessed water body in the region is officially impaired—all 50 of them fail to meet their designated use standards. Only nine have made it onto the formal 303(d) list, meaning 41 are degraded enough to be tracked but not yet formally listed as polluted. The Merrimack at Garvins Falls Dam carries that formal 303(d) designation, a reminder that no volume of water washes away chemical or biological insult.A flood event in a truly functional stream renews the ecosystem; it scours filth, redistributes gravels, reconnects floodplains. Here, the disturbance merely amplifies an existing condition—moving contamination faster and farther, leaving behind the same degraded baseline.

The open sandy areas near Concord hold a particular kind of stillness in early summer. The grasses stand thin, the soil between them pale and dry. Sundial lupine grows here in scattered patches, its spikes of blue-purple flowers just beginning to fade at the base while the upper florets still hold color. Look closely at those spikes and you may find something small moving: a dusted skipper, working the flowers or resting on a stem with wings half-open in the heat.The dusted skipper is a small, dark butterfly, the upper wings a deep brown with a faint dusting of gray scales near the body. It is a threatened species in New Hampshire, and its situation here is tied directly to sundial lupine, which is itself threatened across much of its northeastern range. The caterpillars of the dusted skipper feed on lupine and almost nothing else. A female will locate a lupine plant, lay a single egg, and the larva that hatches will construct a shelter by rolling a leaf and fastening it with silk. It feeds, molts, and eventually overwinters in that shelter at the base of the plant, pupating in late spring. The adult that emerges in early summer has only a few weeks to find a mate and start the cycle again before the window closes.This is the window right now. The lupine is in flower, which is when the adults are flying. That timing is not coincidental. The adult skippers do nectar on lupine, but they also use other open-area flowers nearby: spreading dogbane, common yarrow, annual fleabane. The frosted elfin, another threatened butterfly in this landscape, shares the same dependence on lupine for its caterpillars, and the two species can sometimes be found in the same patch. What limits both is the same thing: the lupine itself. Sundial lupine requires open, sunny, well-drained, sandy ground. It does not persist in shade or in dense grass. Across southern New Hampshire, that habitat has been compressed by development and by the natural succession of open land back into scrub and forest. What remains is patchy, and the populations of both butterflies are patchy to match.The sandy openings here are also under pressure from invasive plants. Smooth brome and autumn olive have both established in this area. Smooth brome is an invasive grass that forms dense sod, shading out lupine seedlings and filling the open ground the plant needs. Autumn olive, an invasive shrub, advances the succession of open areas toward dense cover. Neither species kills lupine outright, but both narrow the ground it can hold. The dusted skipper does not adapt to a different host plant. If the lupine goes from a site, the skipper goes with it.The grasshopper sparrow has been recorded in this area, and that tells you something about the structure of the habitat: open, grassy, with bare patches and low vegetation. It is the same structure that suits lupine. The two things are indicators of the same conditions, though they have nothing to do with each other directly. What they share is ground that has stayed open long enough for species with narrow requirements to establish.If you are standing near a lupine patch right now, watch the flowers for a minute. The dusted skipper is not a flashy insect. It holds low, moves quickly between stems, and perches with wings folded when it rests. The undersides of the wings are patterned in soft brown and cream, which makes it nearly invisible against a dry stem. You are more likely to notice it moving than sitting still. The flower spikes are tall enough to catch whatever breeze is crossing the opening, and in the heat of midday the whole patch shimmers faintly. That is the moment the skippers are most active, when the air is warm and the lupine is still in bloom.

Above Concord's neighborhoods and wetlands, the air fills with the chittering calls of chimney swifts. These sickle-winged birds slice through the early summer sky in erratic arcs, their mouths open wide as they collect the season's bounty. The longest days of the year have arrived, and with them, the emergence of countless aquatic insects from streams, ponds, and marshes throughout the region.Chimney swifts never land except to nest and roost. They feed, drink, and even mate on the wing. Their entire lives unfold in three dimensions above us. In early summer, these aerial hunters face their greatest challenge: feeding nestlings tucked inside chimneys and other vertical structures around town. The young birds demand constant provisioning, and parent swifts respond by hunting almost continuously from dawn until dusk.The timing aligns perfectly with one of nature's most reliable food pulses. Mayflies, caddisflies, and other aquatic insects spend months or even years developing underwater as larvae. When water temperatures warm and daylight peaks, they emerge en masse over just a few days or weeks. The insects crawl from streams and ponds, shed their nymphal skins, and take to the air for their brief adult lives. Some mayflies live only hours as winged adults, just long enough to mate and lay eggs. For chimney swifts, this emergence represents a concentrated feast. The birds gather wherever the insects rise thickest. Over the Merrimack River and smaller waterways, swifts wheel and dive through clouds of newly emerged insects. Their gular pouches, expandable throat sacs, allow them to collect dozens of small insects during a single hunting flight before returning to feed their young.The swifts hunt in layers. Some skim low over water surfaces where insects first take wing. Others patrol the middle air where thermal currents carry the insects higher. The highest fliers intercept insects that have dispersed widely from their emergence sites. This vertical partitioning means swifts can exploit the insect emergence at multiple elevations simultaneously. Parent birds make dozens of feeding trips each day. They compress their catch into a compact ball held in their throat pouch, delivering protein-rich meals to nestlings that will double their weight in just weeks. The young swifts must grow quickly. By late summer, they will join the adults in their remarkable migration to South America, spending the winter months in perpetual flight above the Amazon basin.But for now, in these longest days, the focus narrows to the immediate demands of raising young. The adult swifts trace their hunting patterns against the evening sky, their calls echoing off buildings and trees. Each erratic flight path follows the invisible highways of rising insects, the ancient choreography of predator and prey played out in the air above Concord. Listen for their chittering calls overhead, sharp and insistent against the softer sounds of evening.

The morning light catches the silver undersides of leaves turning in a warm breeze. Here in this sandy opening among the pines, where the soil stays dry and the sun reaches down unfiltered, a small drama unfolds that most will never see. If you are walking through similar habitat today, pause at the edges where forest meets field. Close your eyes and listen to the quiet rustle of low-growing plants.A frosted elfin butterfly, no larger than your thumbnail, settles on a spike of purple flowers. Her wings are brown-gray above, frosted white below, and she moves with the deliberate care of someone making the most important decision of her life. The flowers belong to sundial lupine, a plant that grows in scattered colonies across this rare habitat. The butterfly tests the plant with her antennae, tapping the stem, the leaves, the developing seed pods. She is searching for the perfect place to lay a single egg.This is not a casual relationship. The frosted elfin caterpillar can survive on sundial lupine alone. No other plant will do. The butterfly evolved alongside this lupine, timing her brief adult life to match the plant's flowering period. When she finds a suitable flower spike, she curls her abdomen forward and deposits one small, pale egg on a flower bud or young seed pod. The caterpillar that emerges will feed on the lupine's flowers and developing seeds through the summer, then pupate in the soil below the plant. Next spring, if all goes well, another frosted elfin will emerge to continue the cycle. The lupine benefits too. The caterpillars eat some flowers and seeds but leave most intact, and the adult butterflies help pollinate the remaining blooms as they move between plants.But sundial lupine is disappearing. The sandy, open habitats it requires are rare in New England, squeezed between expanding forests and human development. The invasive multiflora rose and Japanese barberry that grow here crowd out native plants, changing the soil chemistry and light conditions the lupine needs. Each lost lupine colony means fewer places for frosted elfins to lay their eggs. The butterfly's specialization, once an advantage that allowed it to thrive in a specific niche, now makes it vulnerable. When the lupine goes, the elfin goes with it. The wood thrush calls from the canopy above, the eastern towhee scratches in the leaf litter, but the elfin's world shrinks to the handful of lupine plants that remain. You can see this partnership playing out right now if you know where to look. The lupine's purple flower spikes rise from low rosettes of palmate leaves. The plants grow in small clusters, connected underground by spreading roots. On warm afternoons in late spring, when the sun heats the sandy soil, frosted elfins emerge to mate and search for egg-laying sites. Their flight is low and erratic, easy to mistake for a small moth or skipper. But watch closely and you will see them return again and again to the same lupine plants, testing and choosing with an urgency born of a short adult lifespan and a single chance to get it right.The breeze stirs the lupine leaves again, each one divided into narrow fingers that catch and release the light. Somewhere in this quiet opening, a frosted elfin may be making her choice, guided by chemical signals and inherited knowledge, continuing a partnership that has persisted here for thousands of springs. The purple flowers nod slightly in the moving air.