After conducting some research, I was unable to find any specific information about a boat ramp named Oliver County in North Dakota. It is possible that this boat ramp may not exist or that it has been renamed or closed.

However, if we look at the general information about boat ramps in North Dakota, we can make some assumptions about what Oliver County boat ramp may have been like if it did exist.

Boat ramps in North Dakota are typically constructed and maintained by the state or local governments, and are open to the public year-round unless otherwise noted. They provide access to a variety of bodies of water, including lakes, rivers, and reservoirs, for a range of watercraft, from small canoes and kayaks to larger fishing boats and pontoon boats.

Boat ramps may vary in size and design depending on their location and the body of water they service. Some are concrete or asphalt ramps that extend into the water, while others may be gravel or dirt ramps that are more primitive. The width of a boat ramp can also vary, but they are generally wide enough to accommodate at least one vehicle and trailer at a time.

In order to use a boat ramp in North Dakota, boaters are typically required to obtain a boat registration and a watercraft permit, which can be purchased online or at a local licensing agent. Boaters should also be familiar with the rules and regulations for the specific body of water they plan to use, such as speed limits, no-wake zones, and restricted areas.

In summary, while we don't have specific information about the Oliver County boat ramp in North Dakota, we can assume that it would have been a public access ramp that provided access to a nearby body of water for a variety of watercraft. Boaters would have needed to obtain the necessary permits and follow the rules and regulations for the area.