River Rock announced on April 26 its plans to dredge the on-site marina later this year as part of a series of upgrades to celebrate the resort's 20th anniversary.

The additions to the River Rock Casino near Geyserville would add roughly 3,000 square feet to the 37,000-square-foot gaming floor and about 1,200 square feet to the 8,000-square-foot dining area.

The Indian tribe that owns River Rock Casino could begin construction within a couple of months on a $300 million, luxury resort hotel and casino to replace its 5-year-old facility in the heart of ...