Middlesex dam to the Route 2 bridge: where the wade fishing starts
The Fly Rod Shop in Stowe, whose guides work this river, writes off the water from Montpelier to Middlesex as slow and silty with a few pockets of fish, and starts the real wading at the Middlesex dam just above the Mad River mouth. From there down to the Route 2 bridge on the east side of Waterbury village is pocket water, deeper runs, riffles and pools holding wild browns and rainbows plus stocked rainbows, with the odd trophy fish that has moved up from the section below. Route 2 between Middlesex and Waterbury is the access. The Stevens Branch, North Branch and Dog River have already doubled the river by the time it reaches Montpelier, so this is a wide river for Vermont; the shop recommends a 9-foot 4 or 5 weight to reach across it and warns that the rocks are slick.
The Waterbury trophy stretch: Route 2 bridge down to the Bolton Dam
Vermont Fish and Wildlife's trophy trout section runs from the top of the Bolton Dam in Duxbury and Waterbury upstream to the Route 2 bridge east of Waterbury village, and includes the Little River from its mouth up to the Waterbury Reservoir dam. The state stocks two-year-old browns and rainbows here from late April through May, some over 18 inches, and the rule is two trout a day with no length limit during the second-Saturday-in-April to October 31 harvest season, catch and release with artificials the rest of the year. The Fly Rod Shop puts the fish at 16 to 22 inches with 26-inch fish not out of the question, and says River Road on the south bank is the best access through the village and on down past the Winooski Street bridge. The Little River matters beyond its own fishing: the shop says the cold bottom release from Waterbury Reservoir cools the Winooski as far down as the Huntington River, which is why this reach fishes in July when the river above Middlesex does not.
Bolton Dam to the Huntington: the slot-limit water and the closed brooks
Below the Bolton Dam the river is a mix of stocked browns, wild rainbows and wild browns, more pools and slower water broken by a few good pocket stretches, with stocked and a few wild juvenile landlocked salmon in the mix. From the Preston Brook mouth upstream about 4.4 miles to the Ridley Brook mouth the state's regulation index sets a 10-to-16-inch protected slot: every trout between those lengths goes back, the limit is two, and only one may be over 16 inches. River Road continues along the south bank to the Jonesville bridge, a hundred yards above the Huntington River, and below that confluence the Fly Rod Shop says the river slows into smallmouth and fallfish water. Four Bolton and Duxbury tributaries, Joiner, Pinneo, Preston and Ridley brooks, are spawning grounds closed to all fishing, catch and release included, from March 16 through May 31 under the rules that took effect January 1, 2026, each from its mouth up to the first falls or the railroad crossing.
The Salmon Hole and the lower river
At the bottom, below the Winooski One hydro dam west of Main Street in Winooski and Burlington, is the Salmon Hole, which the Fly Rod Shop credits with landlocked salmon, steelhead and bass at the right time of year. The state treats the river from Lake Champlain up to that dam as Lake Champlain water for regulations, and closes the reach from the dam down to the first railroad bridge to all fishing from March 16 through May 31. This page's gauge, USGS 04290500 near Essex Junction, reads the whole 1,044-square-mile watershed a few miles above the dam, so it tells you what the river is doing everywhere from Middlesex down, not just here.
Catamount's calendar for the Winooski drainage
Willy Dietrich of Catamount Fishing Adventures publishes a hatch chart for the Lamoille and Winooski drainages that is the most detailed local source: brown stoneflies late April into early May, Blue Quills the first three weeks of May, Hendricksons early to mid May with black caddis and a candy-apple green caddis alongside, March Browns and Gray Fox in the back half of May, Sulphurs from the third week of May and little Sulphurs into August, cinnamon caddis from mid May all season, a five-day Brown Drake in the first two weeks of June, Light Cahills in June, Hex mid June through July, Potamanthus late June to mid July, golden stones July to mid August, Tricos late July through August, White Flies (Ephoron) at the turn of August, flying ants and Isonychia late August through September, and olives in May, early July and again late September through October. His caveat is honest: Vermont is nutrient poor and the hatches are not thick, so attractors and a black or olive Woolly Bugger, which the big fish take for a crayfish, are never wrong. The Fly Rod Shop's September 2026 reports list hoppers, Yellow Sallies, Tricos, flying ants, Isonychia and olives.
Season, the eight-trout general rule, and what Essex Junction means
Vermont's general rule on rivers is a second-Saturday-in-April through October 31 harvest season, eight trout a day in any combination of brook, brown and rainbow with no length limit, and year-round catch and release with artificial flies and lures outside that season. On the Winooski the exceptions are the ones above: two trout in the Waterbury trophy section, the slot limit from Preston Brook to Ridley Brook, the spawning closures on the four brooks and below the Winooski One dam, and Lake Champlain rules below the dam. No shop publishes a wading number for this river, so the page compares the Essex Junction reading to 400 to 1,200 cfs, drawn from the USGS record there: typical monthly flows of about 4,900 cfs in April, 2,600 in May, 1,240 in June, 700 in July, 550 to 575 in August and September and 900 in October. June through September is the wading season; the Fly Rod Shop's warning that the river often tops 70 degrees in summer means a thermometer belongs in the vest and the Little River plume is where to be on a hot afternoon.