Northeast
Nissitissit River
Live Conditions
Nissitissit River — Souhegan River at Merrimack (proxy)
7-Day Flow
→ Stable
24-Hr Pressure
29.48 inHg · → High/stable
Local Weather
Tough conditions — fish deep
Today
🌤️Mainly clear
77° / 64°
Tomorrow
🌤️Partly cloudy
77° / 63°
Sun
☁️Overcast
79° / 59°
Mon
🌧️Rain
78° / 58°
1.34"
Stable conditions — watch for afternoon hatches, especially BWOs on overcast stretches.
Weather by Open-Meteo · No API key · Updated every 30 min
What should I fish today?
One call. Specific to today's exact conditions on the Nissitissit River.
2
Time of Day
What should I pack?
Rod, flies, tippet, and safety gear specific to today's Nissitissit River conditions.
🪰 Hatch Calendar
Nissitissit River · June · Early Summer
Showing typical dates — water temperature data unavailable for live hatch predictions.
Select month
Sulphurs (size 16-18). Light Cahill. Caddis evenings. Best month for the fly-only stretch.
River Map
About Nissitissit River
The Nissitissit River flows south out of New Hampshire into Pepperell before joining the Nashua River, and it is one of a handful of Massachusetts streams carrying a designated fly-fishing-only, catch-and-release regulation on its upper reach. Cold, clear, and spring-fed, it holds a mix of stocked and naturally reproducing wild trout — including native brook trout in the colder upper stretches — in a corridor that receives far less pressure than western Massachusetts tailwaters. It is a genuine hidden gem of the North Central watershed.
Regulations
Fly-fishing-only C&R area: New Hampshire state border downstream to the Prescott Street bridge in Pepperell — conventional fly rod and fly line required, no bait, all fish must be released, open year-round. Standard MA trout regulations apply below Prescott Street. NOTE: USGS gauge 01096503 at Pepperell is unverified — flow data may be stale or unavailable; check with local outfitters or the Waterline app as backup.