Mossbrae Falls is a waterfall flowing into the Sacramento River, in the Shasta Cascade area in Dunsmuir, California. The falls are located just south of the lower portion of Shasta Springs. Access to the falls is via a mile-long illegal hiking trail on the Union Pacific Railroad right of way; the City of Dunsmuir is seeking to finish a safe hiking trail that will includ…Mossbrae Falls is a waterfall flowing into the Sacramento River, in the Shasta Cascade area in Dunsmuir, California. The falls are located just south of the lower portion of Shasta Springs. Access to the falls is via a mile-long illegal hiking trail on the Union Pacific Railroad right of way; the City of Dunsmuir is seeking to finish a safe hiking trail that will include a bridge over the river.