The Coloma to Greenwood C to G river run in California is a class III-IV river run that is best navigated in the spring or early summer months when water levels are highest. This section of the river is known for its technical rapids, including "Troublemaker" and "Satan's Cesspool." Other obstacles include numerous rocks, drops, and narrow channels. The recommended flow for this section of the river is between 800 and 1,200 cubic feet per second (cfs). This run is not recommended for beginners, and a guide is highly recommended for those who are not experienced on this type of river.