 Other amphibians seen in upper riparian habitats include the Pacific treefrog, "Pseudacris regilla" (formerly "Hyla regilla"), rough skinned newt, "Taricha granulosa", and California slender salamander, "Batrachoseps attenuatus".Oversight of Copeland Creek is by the Sonoma County Water Agency; in the year 2006 the Agency cleared cattails and arroyo willow from certain lower reach portions of the creek in order to improve flow characteristics.As with any flood control management strategy, unintended environmental impacts can arise from stream channel modification.