Possible Clues:

• Stick, in Seville
• ___ Duro Canyon, Tex.
• Arizona's ___ Verde Nuclear Generating Station
• East -- Alto
• ___ Pinto (Texas county or its seat)
• Alto preceder
• -- Alto, Calif
• With 16-Across, California tech hub
• Literally meaning "stick," it's the first word in a California city named for a 1,000-year-old redwood
• ___ verde (desert tree)