Fifteenmile Creek (Columbia River tributary)

General data
- Name: Fifteenmile Creek (Columbia River tributary)
- Water system: Columbia River
- Water type: River
- Progression: Columbia River -> Columbia River Estuary -> Pacific Ocean -> Planet Earth
- Climates: Temperate
- Continents: North America
- Countries: United States of America
Description
Fifteenmile Creek is a 54-mile (87 km) long[3] tributary of the Columbia River in the U.S. state of Oregon. It drains 373 square miles (966 km2) of Hood River and Wasco counties. Arising in the Cascade Range near Mount Hood, it flows northeast then west to its confluence with the Columbia near The Dalles. Several species of anadromous fish inhabit streams in the watershed, including steelhead, Pacific lamprey, chinook and coho salmon. Fifteenmile Creek is the easternmost tributary of the Columbia home to winter steelhead. Fifteenmile Creek coho salmon populations are within the Lower Columbia River Coho Evolutionary Significant Unit and are listed as threatened (2011). Populations have declined in recent years, due to a combination of overfishing, an increase of hydroelectric dams, and general worsening of habitat conditions.