Hi Jim,
Thank you for your question about suggested drought resistant flowering shrubs.

The following publication lists a variety of plants and flowering shrubs that are drought resistant and grow well in our Central Oregon climate. A plant description and growing conditions are provided in addition to photos. Garden planning, design and irrigation are also included: Water-wise Gardening in Central Oregon | OSU Extension Catalog | Oregon State University

The OSU Deschutes County Extension website provides many helpful publications about gardening in Central Oregon. Following is a link to this website, which will direct you to gardening topics and plants that are specific for our geographic area and climate.
Central Oregon Garden Publications | OSU Extension Service (oregonstate.edu)

If you need additional information or have questions, I recommend you call the Deschutes County OSU Extension office in Redmond at<personal data hidden>. Ask to speak with Amy Jo Detweiler (oregonstate.edu), a member of the Horticulture Staff. Amy Jo welcomes your home garden questions and is a great resource.