Based on the available information, Cedar Island Lake boat ramp is located in Oakland County, Michigan, with a latitude of 42.63412857 and a longitude of -83.48783875.

This boat ramp provides access to Cedar Island Lake, which is a 144-acre lake in the area. The boat ramp is suitable for launching small to medium-sized watercraft, such as fishing boats, kayaks, canoes, and pontoon boats.

It is not clear how wide the boat ramp is from the available information. However, like most boat ramps, it is likely to be wide enough to accommodate one or more vessels at a time.

Based on the available information, Cedar Island Lake boat ramp is open to the public and is managed by the Michigan Department of Natural Resources. The latest information available suggests that there are no restrictions on the type of craft permitted on the water. However, it is always advisable to check the latest regulations and guidelines before launching any watercraft to ensure compliance with safety standards and any local regulations.