A current regulation that curtails water rights in the Russian River watershed set to expire in July may be extended due to the continuing drought, according to the state agency charged with balancing all water needs of the state.

State Water Resources Control Board officials announced Friday the board released a draft emergency regulation to extend the regulation and clarify some of its requirements.

The Russian River runs from Mendocino County south into Sonoma County. It is the second-largest river in the greater San Francisco Bay Area, behind the Sacramento River.