Several stretches of the Lamprey River and tributaries are known for good kayaking and canoeing. The Appalachian Mountain Club River Guide for New Hampshire and Vermont (2nd Edition) gives a complete description of the river for paddling and where to put in and take out.
The Lamprey River is one of the longest rivers in the Piscataqua Watershed, and it is probably the flattest. The section above Raymond offers Class I rapids for spring paddlers. Below town, the river can be run for most of the year because there are few rapids. Packers Falls, Class II or III, depending on the water level, can be run well into the summer by kayakers and canoeists.
The tidal portion of the Lamprey River can be accessed by venturing upriver from Great Bay (being careful of narrow and shallow channels) or from the boat launch in downtown Newmarket.
The North River’s paddling season is brief, but it definitely offers the best whitewater fun in the Piscataqua Watershed, a 2 ½ mile continuous Class II run above NH 152. Below the NH 152 bridge is the best white water spot on the North River, a favorite of kayakers, fisherman, and photographers alike. This is also the site of an old grist mill.
The Piscassic River is a large brook that flows eastward from Fremont and Epping to the Lamprey River just above Newmarket. The section above NH 87 is extremely difficult and is not recommended unless you enjoy hacking your way through thick alder and vine tangles. Below NH 87 the river is more open, and it has many narrow, tight turns in quickwater. There are a number of downed trees.