Nine Mile Reservoir is a flat-water section of the Spokane River created by Nine Mile Dam. The reservoir offers a 5-mile stretch of calm water paddling between Plese Flats and Nine Mile Dam. This section is well-suited for less experienced paddlers, particularly during summer months after spring runoff has subsided.

Access points include Plese Flats for put-in and the Nine Mile Dam access site (river left) for take-out. The Nine Mile Recreation Area, located at the eastern end of the reservoir, provides two docks and a boat launch that accommodates both motorized and non-motorized watercraft. The boat launch is open from April 1 to October 31. A designated swimming area is also available.

Paddlers should be aware that the reservoir sees motorized boat traffic, particularly during summer months. Strong winds can make paddling challenging in open areas. Water levels can fluctuate significantly based on dam operations and seasonal conditions.

The lower half of the reservoir features numerous beaches and silt flats created by sedimentation, providing convenient rest stops. The waterway borders Riverside State Park and the Centennial Trail, offering scenic views. A line of buoys marks the approach to Nine Mile Dam.

Required permits include a Discover Pass for parking. The Nine Mile Recreation Area serves as a hub for water activities in summer months, with facilities including restrooms and picnic areas. The area around the reservoir has historical significance, with the Spokane House Interpretive Center nearby exploring early fur trade history and Native American culture.

For planning longer trips, paddlers can continue below Nine Mile Dam onto Lake Spokane, though this requires a portage around the dam. The Nine Mile area is accessible through Riverside State Park, which provides additional amenities including camping options and picnic facilities.