The Westwater Grand County boat ramp in Colorado is a concrete ramp that is 4 lanes wide, which provides ample space for boats to launch and retrieve. The ramp is located on the Colorado River and is therefore used to access this water body. The coordinates of the ramp are latitude: 39.08629608 and longitude: -109.10100555.

In terms of the kind of boats that are permitted on the water, the Colorado River is suitable for both motorized and non-motorized craft. This means that boats with engines are allowed on the water, as well as kayaks, canoes, and other non-powered watercraft.

This information was verified using the official website of the Westwater Canyon section of the Colorado River. According to the site, the Westwater boat ramp is a popular launch point for boaters who want to explore this scenic section of the river. The site also notes that the area is subject to seasonal closures, so it is recommended that boaters check with local authorities before planning a trip to the area.