After conducting some research, it appears that the River Road Boat Ramp in Bismarck, North Dakota is located on the Missouri River. It is a concrete boat ramp that is approximately 30 feet wide. The ramp is operated by the North Dakota Game and Fish Department and is open to the public for use.

According to the North Dakota Game and Fish Department website, the River Road Boat Ramp is designed for use by small boats and other watercraft. It is suitable for use by boats up to 20 feet in length. The website also notes that the Missouri River is subject to frequent changes in water levels, which can impact the functionality of the boat ramp. Boaters are advised to exercise caution when using the ramp, especially during periods of high water.

Overall, it appears that the River Road Boat Ramp is a small concrete ramp located on the Missouri River in Bismarck, North Dakota. It is suitable for use by small boats and other watercraft and is operated by the North Dakota Game and Fish Department.