Hmm. I don't know of any places on the Sacramento River where there was placer mining - all the mining took place on the tributaries of the Sacramento, like the North Fork American that goes near my home. There was a confluence of many mountain streams with the Sacramento north of Redding - the Sacramento might have been a good place for placer mining upstream from that confluence (which is now under the surface of Lake Shasta.
And there really are no "Banks of the Sacramento" any more. Levees line the river from Lake Shasta to San Pablo Bay, a distance of some 200 miles. Before the levees were built, the river would flood the Central Valley almost every year, making a paradise for waterfowl (and malaria-bearing mosquitoes).

-Joe-