According to the latest information available, the boat ramp named Beaver Dam Lake -- Access at Derge County Park in Wisconsin is a concrete ramp with a gravel parking area. The ramp is approximately 20 feet wide, which is wide enough to accommodate most watercraft. It services Beaver Dam Lake, which is a 6,700-acre lake located in Dodge County.

At the lake, a variety of watercraft are permitted, including fishing boats, pontoon boats, speed boats, sailboats, canoes, and kayaks. However, it is important to note that there are restrictions in place regarding the use of motorized watercraft. Specifically, there are horsepower restrictions in place, with a maximum of 25 horsepower allowed on the lake. Additionally, there are certain areas of the lake where motorized watercraft are not permitted, such as in the areas near the shorelines or in designated swimming areas.

Overall, the Beaver Dam Lake -- Access at Derge County Park boat ramp is a popular destination for boaters and anglers alike, offering convenient access to one of the largest lakes in the region. With its wide ramp and ample parking, it is a great place to launch a variety of watercraft and explore the beauty and recreational opportunities of the lake.