Based on the latest information available, Waverly Marina boat ramp is located on the Willamette River in Portland, Oregon. The coordinates for the ramp are latitude: 45.46072388 and longitude: -122.66046143. The ramp is a single-lane concrete ramp that is approximately 20 feet wide.

The Waverly Marina boat ramp is primarily used to launch small boats and watercraft such as kayaks, canoes, and small fishing boats. The height of the ramp can vary depending on the water level of the Willamette River. The ramp is also accessible for handicapped individuals.

The Willamette River is a major waterway in Oregon that runs approximately 187 miles from the Cascade Mountains to the Columbia River. It is a popular destination for boating, fishing, and other water-related activities.

According to the Oregon State Marine Board, all motorized boats require a current registration and a boater education card in Oregon. Additionally, boats must comply with safety equipment requirements, including personal flotation devices for each person on board, fire extinguishers, and sound signaling devices.

In summary, the Waverly Marina boat ramp is a single-lane concrete ramp located on the Willamette River in Portland, Oregon. It is approximately 20 feet wide and is primarily used to launch small boats and watercraft such as kayaks, canoes, and small fishing boats. Motorized boats are also permitted on the Willamette River, but they must comply with state registration and safety requirements.