Studies of sturgeon spawning habitat in other river basins in the western United States where spawning and rearing are successful, including the Sacramento River, the Columbia River, and the Fraser River, generally describe the location of spawning sites as having relatively high velocity and a substrate that is composed of gravel and larger- sized material (Paragamian and others, 2001; Perrin and others, 2000; and Parsley and others, 1993). However, there are some site-specific differences from these idealized habitat values.