Based on available information, the boat ramp named Windy Flat Road in Okanogan County, Washington is a concrete boat ramp. It is reported to be 14 feet wide, which should be wide enough for most trailerable watercraft. The boat ramp services Palmer Lake, which is a popular destination for fishing and recreational boating.

As for the kind of craft permitted on the water, it appears that the lake has no specific restrictions on watercraft. However, it is important to note that Washington State requires all motorized boats to have a valid registration and carry appropriate safety equipment. Additionally, the lake may have its own rules and regulations that visitors should be aware of.

It is important to note that information regarding boat ramps and their specifications can change over time. Therefore, it is recommended to verify the accuracy of this information with local authorities or reliable sources before planning a trip to the area.