California. Pine Flat Lake (USACE) Enjoy one of California's largest lakes with beautiful views for miles! Working with a great team of Park Rangers and Volunteers is just one of many reasons Pine Flat is a great place to be. Pine Flat is home to the scenic Kings River and is rumored to be some of the best fishing around! Take advantage of our area, enjoy meaningful work, and enjoy endless adventures in the surrounding Sierras. Contact the volunteer coordinator at: 559-787-2589 or [email protected]