Dublin Lake

Dublin Lake sits high in the Monadnock region of southwestern New Hampshire, 236 acres of remarkably clear water at 1,480 feet of elevation in the town of Dublin, Cheshire County. On a map it looks like an ordinary mid-sized pond; on the depth chart it is anything but. The bottom falls away to 100 feet, and the mean depth is a startling 64 feet, a ratio of average to maximum depth almost unheard of in a lake this size. Dublin is less a bowl than a flooded well, an oligotrophic coldwater basin with narrow shoreline shelves that drop quickly into deep, cold, oxygen-rich water.

That depth is the reason Dublin Lake owns a peculiar place in American fisheries history. It was one of only two lakes ever known to hold the silver trout, a native char now extinct, and the same cold, clear conditions that once supported that lost fish make Dublin excellent brook trout habitat today. New Hampshire Fish and Game manages it as a Designated Trout Pond, stocking brook trout that grow well on a forage base that includes rainbow smelt, a rarity in a trout pond of this size and a key reason Dublin's brookies can run larger than the put-and-take average.

The fly angler's season here follows the temperature. At ice-out and through spring, brook trout cruise the thin shoreline shelves and the few shallow flats, and this is the window for smelt-imitating streamers stripped on intermediate lines, along with the season's first midge fishing. As the surface warms, the fish slide down to the thermocline, and summer success belongs to anglers willing to anchor and fish chironomid pupae deep under an indicator over the drop-offs. Fall cooling brings the brookies, now in spawning colors, back within easy reach of a floating line.

Dublin carries a warmwater supporting cast, with smallmouth and largemouth bass working the limited rocky and weedy margins, and the smallmouth in particular offer fine sport on streamers and poppers in early summer while the trout are deep. But this is fundamentally a coldwater lake, and it fishes like one.

Access is modest, which is part of the charm. A shallow gravel ramp with a tight turnaround and parking for only a handful of vehicles keeps the big-boat crowd away, and a speed restriction keeps the water quiet. Dublin is canoe, kayak, and float-tube water: a low-pressure, deep, clear trout pond in the shadow of Mount Monadnock that punches far above its size.

Dublin Lake is a deep, clear, oligotrophic basin, and its defining feature is how fast it gets deep. With a mean depth of 64 feet against a maximum of 100, the depth chart shows tight contour lines nearly everywhere: narrow shoreline shelves give way almost immediately to steep walls falling into a broad, deep central basin. There is comparatively little shallow littoral zone, so the weedbeds, rocky margins, and insect habitat that do exist are concentrated in a thin band around the rim, and finding them matters.

The lake stratifies strongly in summer, with a well-defined thermocline separating warm surface water from the cold depths where the brook trout spend July and August. Water clarity is high, typical of a nutrient-poor lake at this elevation, which makes for spooky fish on calm days but also makes sight-fishing the shallow margins possible in spring and fall.

The forage base sets Dublin apart from most small New Hampshire trout ponds: rainbow smelt share the water with the usual chironomid populations, leeches, and the dragonflies and damselflies of the shoreline band. Yellow perch and brown bullhead round out the community, with smallmouth and largemouth bass patrolling the rocky and weedy edges.