Popular with Groups and Good for Kids Fillmore Fish Hatchery is fun and educational. Its located in eastern Ventura County and along the Santa Clara River, Fillmore Hatchery raises trout for stocking Southern California waters. Surrounded by citrus and avocado orchards, the Fillmore area offers excellent fresh fruit vendors along Highway 126. Outdoor enthusiasts enjoy the Los Padres National Forest, just north of the Santa Clara River valley.