National Creek Falls is a broad waterfall on National Creek in Douglas County, Oregon, on the western side of Crater Lake National Park. Dropping into a moss-ringed grotto on the pumice flanks of Mount Mazama, it reflects the cool, damp forest around it. A short trail from Crater Lake Highway leads through mixed conifer forest to the base of the falls. The nearby Diamond Lake Road has deeper historical importance: first used as a wagon route between the Rogue Valley and the newly discovered John Day Valley gold mines, it also made the National Creek drainage a layover for miners and stockmen traveling east before the Forest Service reopened the route in 1910.