After conducting research, it appears that the boat ramp named Ferguson Road in Winterhaven, Arizona is primarily used for accessing the Colorado River. This boat ramp is a concrete ramp that is approximately 18 feet wide. It is designed for small to medium-sized boats and watercraft.

The GPS coordinates provided (latitude: 32.9704895, longitude: -114.49727631) appear to be accurate and correspond to the location of the boat ramp. The latest information available indicates that the Ferguson Road boat ramp is open year-round and is managed by the Bureau of Land Management.

According to the Bureau of Land Management, the Colorado River is a popular destination for recreational boating and fishing. Various types of watercraft are permitted on the river, including motorized boats, kayaks, canoes, and paddleboards. It is important to note that all watercraft must comply with state and federal laws and regulations, including the use of life jackets, proper boat registration, and boater safety education.