APM: 5 Location: Preston Ave and Main St, Ione Just as 124 joins 104 it will split to continue east. APM: 5 Location: Preston St and Plymouth Hwy, Ione Follow 124 east to Plymouth and Placerville.  W to SR 99, E to SR 88  W to SR 88, E to SR 16 W to SR 104, E … Continue reading California State Route 104, SR 124 to SR 124