Lost Lake County Park Take Highway 41 north to Friant Road. Follow Friant east 8 miles, park entrance will be on your left. This 305-acre county park features riverfront picnic & barbecue facilities, restrooms, open wildlife habitat, boat launch, and a self-guided nature trail. Along the trail you’ll witness a variety of bird life as well as native American grinding holes in the boulders bordering the river. Straight across the river from the south end of the picnic area, you will see a tree that is home to a large flock of black-crowned night herons. Snowy egrets, Great Blue Herons and even an occasional bobcat can be spotted in the undeveloped areas of the park. Access to the San Joaquin River is right here. Bass fishing is pretty good in the river.