Based on the latest information available, the Coulee Corridor Grant County boat ramp in Washington is a concrete boat ramp that is 20 feet wide. This boat ramp services Banks Lake, which is a reservoir located in the Grand Coulee area of Grant County, Washington. The lake is known for its fishing opportunities, and a variety of watercraft are permitted on the water, including motorized boats, canoes, kayaks, and stand-up paddleboards. It is important to note that regulations and restrictions may vary depending on the season and local laws, so it is recommended to check with local authorities or park officials before using the boat ramp and accessing the water.