| 11.1 | At 11.1 ft. extreme flooding will occur in the headwaters of the North Fork of the Virgin River in Zion National Park through the towns of Springdale and Rockville. Any slot canyon, stream or river in this watershed will experience extremely hazardous conditions. | | 10.1 | At 10.1 ft. extreme flooding of the slot canyons and small streams of Zion National Park will occur. These areas are extremely hazardous to any hikers in the area. | | 9.3 | At 9.3 ft. flooding will occur in the slot canyons and small streams of Zion National Park. Hikers in these areas may be subject to very dangerous flows. |
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1) 10.25 ft on 09/17/1961
2) 8.84 ft on 08/05/1963
3) 8.52 ft on 09/11/1998
4) 7.53 ft on 08/30/1999
5) 7.50 ft on 08/10/1997
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1) 0.17 ft on 04/12/1995
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