Possible Clues:

• ___ Pinto (Texas county or its seat)
• Stick, in Seville
• Arizona's ___ Verde Nuclear Generating Station
• Texas's ___ Duro Canyon
• With 4-Across, part of Silicon Valley
• Word before "santo" or "Alto"
• Alto preceder
• -- Alto, Calif
• East -- Alto
• Literally meaning "stick," it's the first word in a California city named for a 1,000-year-old redwood