Nestled in the mountains of the quiet California town of Ojai is Matilija Dam, which has become a poster child of the national dam removal movement. At 168ft high, the dam towers above Matilija Creek. Since the dam’s construction in 1947, an estimated 8 million cubic yards of sediment have clogged Matilija reservoir, rendering it useless for water storage and flood control, while trapping sediment that would have flowed into the Ventura River and then fed Ventura’s coastline nearly 16 miles downstream.