The Piscataqua River is a major tidal river forming the border between New Hampshire and Maine at the coast. It is characterized by very strong currents, particularly in constricted areas like under the Little Bay Bridge in Dover and near the Portsmouth Harbor Lighthouse, where the incoming tide can create a current strong enough to hold a kayak at a standstill. These powerful currents, combined with significant boat traffic in the main channel around Portsmouth Harbor, make much of the river suitable only for experienced paddlers. For novices, calmer conditions can be found in protected back channels and coves, such as the area behind Pierce Island or Pepperell Cove. The river's conditions are heavily influenced by wind opposing the tidal current, which can build up substantial chop, especially in exposed areas. Planning a paddle here requires careful attention to tide charts and wind forecasts. Several public launch sites provide access. These include a boat ramp in Kittery, Maine, across from the Navy Yard, which is noted for having a milder current in its back channel. Other access points are at Odiorne State Park in New Hampshire, Hilton Park, and Pierce Island. A key safety consideration is to launch on the same side of a bridge as your intended paddling area, as paddling against the current under bridges like the Little Bay Bridge is not feasible. The river offers views of historical sites like the Portsmouth Naval Shipyard, lighthouses, and Fort Foster. Paddlers may also encounter working harbor traffic in Portsmouth. The recommended season for paddling is summer, from June through August.