An Idaho riverfront mansion previously asking $3.86 million goes to auction without reserve on September 17; its owner has pledged the sale proceeds 50:50 to St. Jude and Mayo Clinic

• The property sits in American Falls, a southeastern Idaho community surrounded by broad valleys, mountain ranges, reservoirs and large areas of public land.
• A sprawling Idaho estate with sweeping Snake River views is taking an unusual route to its next owner.
• Even more unusually, the proceeds will serve a charitable purpose, with the ow