Sun Creek is a tributary of Annie Creek. Its source is also inside the boundary of Crater Lake National Park where it supports a population of bull trout. After leaving the park, it flows through the middle of Sun Pass State Forest for three miles (5 km). It flows into Annie Creek about one mile (1.6 km) beyond the forest border. Once it leaves the forest, Sun Creek is tapped for agricultural irrigation; however, the Department of Forestry protects the upper reach with a Protective Conservancy — Critical Wildlife Habitat land use classification.