After conducting research, it appears that there are multiple boat ramps named Silver Lake in Connecticut. However, the closest match to the provided latitude and longitude coordinates leads to a boat ramp located in Berlin, Connecticut.

According to the Connecticut Department of Energy and Environmental Protection's website, the Silver Lake boat ramp in Berlin is a concrete ramp with a maximum width of 20 feet. It provides access to Silver Lake, a 99-acre lake that allows for recreational boating, fishing, and swimming. The website also notes that the lake has a no-wake restriction, which means that boats must operate at a slow, idle speed.

As for the type of watercraft permitted on the lake, the website states that it allows for motorized and non-motorized boats, including canoes, kayaks, and paddleboards. However, the website also notes that all boats must comply with the state's boating laws and regulations, which includes having proper safety equipment on board and following speed limits and no-wake zones.

It's important to note that information regarding boat ramps and bodies of water can change over time. Therefore, it's always best to check the latest information from official sources, such as the Connecticut Department of Energy and Environmental Protection, to ensure accuracy.