following scheduled high volume reservoir releases during summer months from the Tennessee Valley Authority Wilbur Dam flowing through Elizabethton, Tennessee (Northeast Tennessee); also upstream of both TVA Wilbur Dam and Watauga Dam as a separate, non-commercial run beginning in North Carolina to Johnson County, Tennessee above Watauga Lake; Class IV-V. Western United States In the western United States, the more noted rivers, such as the Grand Canyon have much greater water volume and therefore require a different set of paddling skills. Western rafters also navigate many small, low volume rivers, some with much steeper descents than eastern rivers; however, since the mountains are newer in the west, the hazard from undercut rocks, a problem in the east, is replaced by more frequent log jams precipitated by logging activities near the rivers. The big-water rivers usually do not require the precision paddling of smaller rivers, but have larger rapids and longer wilderness trips due to the greater length and water flow of the big rivers. The smaller rivers and creeks boated by most rafters offer many one- or two-day trips with difficulty levels from I to VI. In the West, some paddlers start on the American in California and work their way up to the Rogue and Illinois in Oregon, the Tuolumne (California), the Salmon in Idaho, the Snake, and then the big-water rivers like the Green and Colorado through the Grand Canyon (Arizona), the Fraser in British Columbia, and many Alaskan streams. California California has some of the most challenging whitewater runs in the United States as well as several rivers with sections that are safe for families with children who wish to go rafting. Several rivers in California are fed by the snowmelt of the Sierra Nevada mountain range as well as natural springs in high mountainous areas; some rivers flow directly through protected land and foreign visitors should be strongly warned that early spring runs can be very dangerous; the normal classification cranks up much higher turning some runs into death traps for even Olympic level whitewater enthusiasts. A primary example would be Cherry Creek, a class V-V+ river in normal conditions: this creek has had a number of fatalities to its name for unwary kayakers because the water cuts through high vertical walls of granite: there is no way out except down the river and certain sections cannot be portaged. If the water volume gets too high,