The California Department of Water Resources is telling boaters to expect an invasive mussel inspection program in effect at Lake Oroville by Memorial Day weekend. DWR said Friday that it is still finalizing the details of the mandatory inspection program for Lake Oroville, Thermalito Forebay and Thermalito Afterbay. But staff have already begun placing concrete blocks around Thermalito Afterbay to block access to unauthorized launch areas and direct launching to Monument Hill. … DWR said it is working with other lake managers on a reciprocity program to allow boat owners to use other lakes without the need for reinspection. The agency added that it is working with Yuba Water Agency to put a similar plan to Lake Oroville in place at New Bullards Bar in June.

Other invasive species news:

• ABC10 (Sacramento, Calif.): Boaters urged to stay ‘above board’ as Folsom Lake battles invasive mussel threat