According to the official website of the South Dakota Game, Fish, and Parks, the Calvert Road boat ramp in Pennington County is a concrete ramp that is 18 feet wide and has a maximum boat length of 21 feet. The ramp provides access to Pactola Reservoir, which is a popular destination for boating, fishing, and other water-based activities in the Black Hills region of South Dakota.

The website states that Pactola Reservoir allows motorized boats, including watercraft with gasoline-powered engines, electric motors, and jet motors. However, the use of personal watercraft (PWCs) such as jet skis, wet bikes, and other similar craft is prohibited on the reservoir.

It is important to note that the information provided is accurate as of the time of writing, but it is always advisable to check for any updates or changes before planning a trip to the Calvert Road boat ramp or any other boating access points in South Dakota.