Listed on the National Register of Historic Places with the National Park Service, the Riverside Hot Springs Inn is the only full service hotel in Lava Hot Springs, Idaho. The Riverside Hot Springs Inn was built in 1914 and quickly acquired the label of “The Honeymoon Hotel” for its yesteryear elegance. The Riverside Hot Springs historic Inn is located next to the Portneuf River in downtown Lava Hot springs. We are the only full service hotel in town, featuring 18 guest rooms, world famous onsite hot springs, massage, & award winning onsite restaurant & lounge, the Portneuf Grille & Lounge. We've got it all under one roof-you don't even have to leave the building. Perfect for the business traveler or those seeking a relaxing, rejuvenating experience.