The River Mersey is an iconic waterway in North West England, stretching approximately 70 miles from its origins in West Yorkshire to the Irish Sea at Liverpool. The river offers a range of paddling experiences depending on which section is tackled, from moving water and weirs in the upper reaches to a wide tidal estuary in the lower sections.

The upper section between Stockport and Carrington has been designated the Mersey Canoe Trail. A common put-in is at Ford Street in Stockport, with a take-out at Northenden, covering roughly 5 to 6 miles. This stretch features easy whitewater and several weirs, with portage options available for those who prefer not to run them. Access points along the river's length remain limited overall, and Paddle UK has noted that the situation is far from ideal despite the trail designation.

Below Warrington, the river becomes large and wide, and remains a busy passage for commercial vessels. The lower estuary, from the mouth at New Brighton and Crosby down to Eastham, carries the fastest tidal flows, reaching up to 6 knots, and sees significant commercial traffic including container ships, oil tankers, ferries, tugs, and pilot boats. Paddlers on the lower Mersey are required to contact Mersey VTS on VHF Channel 12 before setting out, informing harbour control of their plans and confirming they will stay clear of commercial traffic. The area around Eastham has sandbanks that can produce overfalls, and landing stages and structures along this stretch pose a pinning hazard in strong currents.

In the mid-estuary between Widnes and Liverpool, the river widens considerably, and paddlers pass the National Trust-owned Speke Hall, a Tudor building with formal gardens on the north bank. The route also takes paddlers past John Lennon Airport and the Royal Albert Dock near Liverpool city centre. Wind speed and direction should be carefully checked before paddling the more exposed sections of the river.

Venture Outdoors, based in Stockport, operates guided canoe, kayak, and paddleboard trips on the river and is a Paddle UK delivery partner, making the upper Mersey accessible to beginners and organised groups. Liverpool Sailing Club at Garston Coastal Park on the north bank of the estuary has a 300-metre slipway providing river access for water sports.