Great Flood of 1862 [SEP] start time
Great Flood of 1862
The Great Flood of 1862 was the largest flood in the recorded history of Oregon, Nevada, and California, occurring from December 1861 to January 1862, caused by an ARkStorm. It was preceded by weeks of continuous rains and snows in the very high elevations that began in Oregon in November 1861 and continued into January 1862. This was followed by a record amount of rain from January 9–12, and contributed to a flood that extended from the Columbia River southward in western Oregon, and through California to
between Don Pedro Dam and La Grange Dam, about above the mouth, before the start of large irrigation diversions. A USGS gage recorded an average annual flow of here between 1911 and 1970, with a maximum peak of on January 31, 1911, and a minimum monthly mean of in October 1912. During the Great Flood of 1862, the river reached an estimated peak of here, after a record of rain fell in the Tuolumne River basin between November 11, 1861 and January 14, 1862, as recorded at Sonora