In terms of area flooded, the December 1955 flood ranks as the record for the region (since 1950), with nearly 100,000 acres flooded.ĭamage was not quite as severe as that experienced in the November 1950 flood ($4.0 million in 1955 vs. ![]() In terms of river flow, December 1955 is the record flood on the Truckee River at Reno (20,800 cfs), and second largest (after January 1997) on the East Fork Carson (17,600 cfs at Gardnerville) and upper portion of the mainstem Carson River (30,000 cfs at Carson City). ![]() As the snow level rose to over 9,000 feet during the storm, there was an accompanying 15 inches of snowmelt. The bulk of the rainfall fell from December 21 to 23. From December 16 to 24, 1955, precipitation at the headwaters of the principal river basins ranged from 10 to over 20 inches. ![]() Like most major floods affecting the region, this event resulted from extremely heavy rain combined with unseasonably warm temperatures (a “pineapple connection”) which caused a substantial melt of a large Sierra Nevada snowpack.
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