This post-Victorian, Eastlake and Craftsman style mansion was built in 1907 by Henry and Delia Armstrong and then sold in 1910 to J.W. and Lulu Heron. J.W. started a meat market and later became mayor. Lulu was a school teacher and behind the house is a hidden staircase that Lulu used to use to get to school. The school, which used to sit above the house, has since been moved and the staircase is no longer used. The Herons had two daughters, Blanche and Frances. Blanche married Harold Bradley and they took possession of the home until 1971. Blanche's daughter, Harriet Bradley Tagart made a gift of her parental home to the town of Cathlamet as a memorial to her Mother. In February 1973 the house was dedicated as the Blanche H. Bradley Memorial Center and for 14 years also housed the public library.

In 1987 the town of Cathlamet put the house up for sale. It was purchased by Arlita Clark who began the Country Keeper Bed and Breakfast. She sold it in 1989 to Australians Meredith and Terry Beaston who continued the B & B. They sold it to Tony and Barbara West in 1991 and it continued as the Country Keeper until 1999. On March 29, 2002 Dennis and Audrian Belcher bought the home and after two years of the house being closed as a Bed and Breakfast they opened May 1, 2002 as The Bradley House of Cathlamet. The Bradley House is not only an Inn, it also has a gift shop full to the brim with tea assessories, hats, whimsical red hatter treats and features custom tea cards by Kimberly Shaw Graphics. It is also home to the La-Tea Dah Tea Room and Restaurant and OO-La-La-Lattes by Kobos.