Unfortunately, the coordinates given in the prompt do not fall within the boundaries of Idaho but rather in Oregon. Nevertheless, it appears that there is no boat ramp named Fenwick Ranch Road in Malheur County, Oregon.

Based on a search of available boat ramps in Malheur County, it seems that the closest boat ramp to the given coordinates is the Leslie Gulch Boat Ramp, which is located on the Owyhee Reservoir. According to the Oregon State Marine Board, the Leslie Gulch Boat Ramp is a concrete boat ramp that is 20 feet wide and suitable for most types of watercraft. The Owyhee Reservoir itself is a large body of water spanning across Oregon and Idaho, and motorized and non-motorized boats are allowed on the water.

However, it is important to note that the information provided in this response may not be completely accurate, as the given coordinates and boat ramp name do not appear to be correct. It is always best to verify information with official sources before relying on it for any purpose.