After conducting research, it appears that Happy Rock Moorage Inc. is a private marina and boat ramp located on the Columbia River in Oregon. It is accessible to residents who rent or own moorage slips at the facility.

While information on the width of the boat ramp is not readily available, it can be assumed that it is wide enough to accommodate the types of watercraft allowed at the marina.

According to the marina's website, Happy Rock Moorage Inc. services the Columbia River, which is a large waterway that spans several states. The marina is located near the city of Portland, Oregon, and is easily accessible by car.

As for the types of watercraft permitted on the water, it appears that Happy Rock Moorage Inc. allows a range of boats, including power boats, sailboats, and houseboats. However, it is important to note that the marina is privately owned, and therefore, restrictions may apply.

In summary, Happy Rock Moorage Inc. appears to be a private marina and boat ramp located on the Columbia River in Oregon. While specific details on the width of the boat ramp are not available, it services a range of watercraft and is accessible to residents who rent or own moorage slips at the facility.