If you can wait a bit longer to dump, there is a fabulous Caltrans rest area along Highway 299 that has a free RV dump station. It's the
Francis B. Mathews rest area, 3 miles east of Salyer, right on Hwy 299. We were there just a few weeks ago, and I gotta tell y'all, it is probably the nicest Caltrans rest area I have ever seen, and I've lived in CA for 35 years. Beautiful setting, clean restrooms and grounds, and that free dump station. Highly recommended.
Also, about 1.5 miles after you pass through Willow Creek going eastbound on 299 (some ways before you reach the rest area), keep an eye out for a small roadside bakery stand on the right side of the road. I think it's at the intersection of Burwood Dr. and Hwy 299. The owner, Corinne, is a professional pastry chef and you'll be amazed at the tarts, cookies, croissants and other goodies for sale in her little plywood shack. Don't pass it up if she's open! And best of all, there's a large dirt lot right next to her shack with room for an RV!
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