The Siletz Bay estuary is located on the Oregon coast at Lincoln City. The estuary is approximately 1461 acres in area and has a watershed of approximately 373 square miles.

The Siletz Bay estuary is designated as a Conservation estuary under the Oregon Estuary Classification system. The geomorphology of the area is that of a Drowned River Mouth estuary.

The Siletz Bay estuary is located in Lincoln County. Principal industries of the county are lumber, fishing, agriculture and tourism. The county seat is in Newport which is also Oregon's oceanography research center with Oregon State University's Marine Science Center, the Oregon Coast Aquarium and their fleets of ocean-going vessels all calling the city home. The 1900 census measured Lincoln county's population at 3,575. By 1997, it had grown to 42,500 representing an increase of 9.3% over 1990.

Paddle this free-flowing river as it changes into a tidal estuary, through nice coastal rainforest. A 7.7-mile canoe trip around the remote hairpin bend of 'Bull's Bag' shows off the area's rainforest of Sitka spruce and mossy bigleaf maples. Along the way, you get to see the river change gears from free-flowing stream to tidal pool.