Massacre Flat is a popular primitive boat-in campsite located on a secluded bend of the Sacramento River, accessible via a 3. 3-mile paddle downstream from Jelly's Ferry.

The site features an open wooded area with an extensive beach, a vault toilet, and multiple campfire rings, making it ideal for boaters seeking a remote camping destination.

Note that the Sacramento River has cold (45-50°F) year-round water and swift currents, so always wear a personal flotation device.