From the ODFW website:
Sturgeon:
BUOY 10 upstream to BONNEVILLE DAM: Effective May 14, 2002, the lower Columbia River will be open to the retention of sturgeon 7 days per week. The daily bag limit is one fish with a 42-inch minimum and 60-inch maximum length restriction. Angling for sturgeon from a floating device is prohibited from Beacon Rock upstream to Bonneville Dam from May 1-July 15 under permanent regulations.
complete report