We champion the resurgence of the Mill Creek Watershed as a regional asset for Southwest OH MCA is a non-profit with 25+ years history. We champion the resurgence of the Mill Creek Watershed as The Mill Creek Alliance champions the resurgence of the Mill Creek Watershed as a natural and community asset. We envision the watershed as a healthy ecosystem where people and communities can thrive. OUR WORK FOCUSES ON RESTORATION, EDUCATION, AND RECREATION. (The Mill Creek Watershed in Southwest Ohio)