An Oregon City woman died in a motorcycle accident Saturday afternoon in Wheeler County.  According to the Oregon State Police, the accident occurred on Highway 207 near milepost 18.  A preliminary investigation found a black Harley Davidson motorcycle, operated by 42-year-old William Charles Edward Herrold of Oregon City, was leading a group of motorcycles northbound on Hwy. 207 when it veered onto the gravel shoulder, lost control, and crashed.  Both Herrold and his passenger, 44-year-old Tanya Marie Ann Herrold, were thrown from the motorcycle.  Tanya Herrold died at the scene, while William Herrold was transported to a local hospital with non-life-threatening injuries.  A second motorcycle operated by 50-year-old Raymond Curtis Zentz of Vancouver also veered onto the gravel shoulder and went down.  Zentz was not injured.  The OSP reported that traveling too fast for conditions was a contributing factor to the crash.