Based on online sources, the Dent Trail boat ramp in Clearwater County, Idaho is a public boat launch that provides access to the Clearwater River. It is described as a "developed" ramp, which likely means it has features like a parking area, restroom facilities, and/or other amenities.

The width of the ramp is not mentioned in available sources, but it is noted that there is a nearby "shoreline area" for boats to be tied up or launched manually. This suggests that the ramp itself may not be particularly wide or deep, and may be best suited to smaller watercraft.

As for the types of boats permitted on the Clearwater River, it is a popular destination for fishing and recreational boating, so it is likely that a variety of vessels are allowed. However, there may be restrictions or regulations in place for certain sections of the river or during specific times of year, so it's important to check with local authorities or signage for up-to-date information.

Overall, the Dent Trail boat ramp appears to be a convenient and accessible option for those looking to launch a boat on the Clearwater River in Clearwater County, Idaho.