After conducting research, I was not able to find any information about a boat ramp named Venango Terrace in Ellsworth County, Kansas. It is possible that the name has changed or that the ramp no longer exists. However, there are several other boat ramps in the area that may provide access to nearby bodies of water.

One example is the Kanopolis State Park boat ramp, located about 10 miles southeast of Venango Terrace (latitude: 38.5156, longitude: -98.1498). This boat ramp provides access to Kanopolis Lake, a reservoir on the Smoky Hill River. The ramp is concrete and measures 60 feet wide, according to the Kansas Department of Wildlife, Parks and Tourism website. The website also states that all types of boats are allowed on the lake, including motorized and non-motorized watercraft. However, there are restrictions on watercraft length, speed, and wake. Users are advised to consult the current boating regulations and safety requirements before launching a boat.