I apologize, but there seems to be some confusion in the question. The coordinates given are for Saint Marie Park Road Pine Bluff, which is in Arkansas, not Iowa. Additionally, there is no mention of a boat ramp at this location.

However, using the latest information available, I can provide information on a boat ramp located in Pine Bluff, Arkansas. The Pine Bluff Boat Ramp is located at the end of Riverfront Drive and provides access to the Arkansas River. It is a concrete boat ramp that is 24 feet wide and has a parking area for vehicles and trailers. The ramp is suitable for launching small to medium-sized boats and is open year-round. A fishing pier and picnic area are also available at this location.

According to the Arkansas Game and Fish Commission, the Arkansas River is suitable for a variety of watercraft, including fishing boats, kayaks, canoes, and jet skis. However, larger boats may have difficulty navigating some sections of the river due to low water levels. It is recommended to check water conditions and weather forecasts before launching any watercraft.