This redwood paneled Craftsman style building was constructed in 1916, with members of the community donating time and money to build the library. Its architect was the nephew of Henry Wordsworth Longfellow, and the most notable donor was Harriet Lee Hammond, the sister of Teddy Roosevelt's first wife. The building is also home to the Upper Lake Women's Protective Club, a mutual aid organization started in 1913 with a long and significant history of service to the community, whose members still conduct their meetings there. Millstones from the pioneer Elliot Grist Mill stand near the entrance.