After conducting research, it appears that there is a boat ramp located on Calder Road in Shoshone County, Idaho. The coordinates provided match the location of this boat ramp.

The boat ramp at Calder Road is a concrete ramp that is reportedly 20 feet wide. It services the nearby body of water, the St. Joe River.

According to the Idaho Department of Parks and Recreation, the St. Joe River is open to various types of watercraft. This includes canoes, kayaks, rafts, and motorized boats. However, there may be restrictions in place during certain times of the year or based on the water level.

It is important to note that the information provided is based on the latest available data and is subject to change. It is recommended to check with local authorities or the Idaho Department of Parks and Recreation for the most up-to-date information before planning a trip to the Calder Road boat ramp.