St. Luke's Health System may expand further west next year, based on an early agreement that would lead to its acquisition of Weiser Memorial Hospital, a small 25-bed public hospital that St. Luke's already manages. If the two organizations decide over the next six months to move forward to an acquisition, they will seek a public vote in Washington County, whose taxpayers support the hospital. If that passes, the Weiser hospital — including its Family Medical Center and Surgical Specialty Clinic — will join St. Luke's on April 1. The process started eight months ago, in December, when Weiser hospital leaders approached St. Luke's. Both organizations formed an integration committee and signed a confidentiality statement.