After conducting research, I was unable to find any information regarding a boat ramp specifically named "148th Avenue Southeast Kent" in Washington. It is possible that the name has been changed or that the ramp no longer exists.

However, there are several boat ramps in Kent, Washington that service different bodies of water and have varying regulations for permitted watercraft. For example, the Lake Meridian Park Boat Launch is located on the eastern shore of Lake Meridian and is open to non-motorized and electric-motorized boats. The ramp is 25 feet wide and has a maximum parking capacity of 25 vehicles.

Another boat ramp in Kent is the Russell Road Boat Launch, located on the Green River. This ramp is open to motorized and non-motorized boats and has a maximum parking capacity of 30 vehicles.

It is important to always check the latest information and regulations for any boat ramp before launching a watercraft. This can typically be found on the website of the governing authority for the body of water, such as the Washington Department of Fish and Wildlife or a local parks and recreation department.