Officials say alcohol was a likely factor in a traffic accident on Tuolumne Road near Woodham Carne just after 3:30 Thursday afternoon.
Police say the D-U-I suspect, identified as 21-year-old William Joseph Snyder, fled the scene on foot but was shortly taken into custody.
Tuolumne Road was blocked for about an hour, backing up traffic in both directions.
Additional reports said the suspect, taken to Tuolumne General Hospital, became combative.
88-year-old Mary Ann Mancini, the passenger in the vehicle which was hit, was taken to Tuolumne General with several broken ribs. The driver, 70-year-old Laura Chilson, was not hurt.