Rothesay

The Rothesay is a wooden twin side-wheel steamer wreck in the St. Lawrence River at the west edge of Prescott, Ontario, on the south side of Highway 2. It is a shore dive in about 7.6 to 9 m (25 to 30 ft) of water.

Entry is from a park and picnic area, where a staircase leads down to the river's edge. From there a rope system leads out to the wreck, meeting it near the midsection where the rocker arm and paddles can still be seen. The bottom is firm silt with weed growth between the wreck and the shore. Visibility runs 4.6 to 9 m (15 to 30 ft), and there is little current, no thermocline and no boat traffic.

The steamer was launched at St. John, New Brunswick, in 1867 and later worked the Montreal to Prescott run. She sank in September 1889 after colliding with an American tug. In 1901 a Royal Military College group used her for explosives practice, which flattened her midsection, though the stern and bow remain relatively intact.