According to the official website of the City of Wilsonville, Wilsonville Memorial Park has a boat ramp that provides access to the Willamette River. The boat ramp is described as a "single-lane concrete ramp" that is "wide enough for two boat trailers to launch at the same time." However, the exact width of the boat ramp is not specified.

The Willamette River is a major waterway in Oregon, running from the Cascade Mountains to the Columbia River. It is a popular destination for boating, fishing, and other recreational activities. The boat ramp at Wilsonville Memorial Park provides easy access to the river for a variety of watercraft, including kayaks, canoes, motorized boats, and sailboats.

As for the kind of craft permitted on the water, the City of Wilsonville website states that "all motorized watercraft must be registered with the Oregon State Marine Board and display a valid registration decal." Additionally, there are certain safety requirements that must be met, such as having life jackets and a fire extinguisher on board.

It is important to note that the information provided is accurate as of the time of writing and is subject to change. It is recommended to check with local authorities or the City of Wilsonville website for the latest updates on regulations and restrictions for using the boat ramp at Wilsonville Memorial Park.