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. A news report by PR Newswire states that after previously being offered for $3.86 million, the 5.3-acre riverfront property in American Falls will be sold without reserve on September 17, 2026, with the final sale price determined entirely by the highest bidder. Even more unusually, the proceeds will serve a charitable purpose, with the owner pledging to split them equally between St. Jude Children’s Research Hospital and Mayo Clinic, adds the online report.

A rare piece of Snake River waterfront

The online report explains it as a rare piece located at 2595 Highway 39, which occupies a substantial stretch of the Snake River, with approximately 370 feet of waterfrontage. The combination of acreage, river access and the scale of the residence makes it an unusual offering in southeastern Idaho’s luxury market. As per the report, the auction is being conducted by Platinum Luxury Auctions in partnership with Idaho listing brokerage Silvercreek Realty Group and listing agent Jadon Whitworth.

A four-story home with more than 12,700 square feet

If we go by the online report, set against the surrounding landscape, the property offers a mix of privacy and recreation, with the river forming a defining part of the estate. The report explains that the centerpiece is a custom-built, four-story residence completed in 1995. The home contains more than 12,700 square feet of living space, with four bedrooms, four full bathrooms and one half-bath. Its exterior combines brick and stone, while the interiors feature materials chosen for a traditional, substantial feel. Quarter-sawn oak flooring, natural wood paneling and specialty brick sourced from Boston are among the details found throughout the house. A two-story great room serves as one of the home’s standout spaces, with a wall of windows overlooking the river. Wood-burning fireplaces add another layer of character, while an executive office provides a dedicated workspace.

Entertainment spaces below

The lower level is designed more like a private retreat than a conventional basement. It includes an entertainment lounge with a commercial-grade bar, along with a home theater, fitness center, sauna and steam room. For the next owner, some of the major infrastructure is already newly updated. The property’s heating and air-conditioning equipment was replaced in August, giving the residence new heating and cooling systems ahead of the sale.

Life in American falls

The property sits in American Falls, a southeastern Idaho community surrounded by broad valleys, mountain ranges, reservoirs and large areas of public land. Outdoor recreation is a major part of life in the region. Boating and fishing are natural draws along the area’s waterways, while hiking, hunting, horseback riding and snowmobiling provide options across the changing seasons. For a buyer seeking a large private residence with substantial river frontage, the estate offers an uncommon combination of space, amenities and setting.

Auction without a reserve

Unlike a conventional listing, the mansion will not have a minimum sale price protecting the seller, adds the report. The bidder on September 17 will take the property, regardless of the final amount. As reported, with its previous $3.86 million asking price, expansive Snake River frontage and charitable purpose, the auction is set to put an unusually distinctive Idaho property in the spotlight.Image Courtesy: PR Newswire