California: Cisco, Keystone, Downieville Avalanches Mar 1868
March, 1868, opened with a violent storm that had continued from the last week in February. The storm laid a depth of ten feet of snow at Cisco, Placer County, which was too much for the Central Pacific railroad to handle, and the road became blocked east of Alta, Placer County.
A snowslide occurred about two miles west of Cisco, March 4, that carried eight Chinese laborers from the railroad track down the mountain side. Six of them were killed.
At Keystone, Sierra County, an immense snowslide occurred March 5. The avalanche came down upon the quartz mill there at 10:30 a.m. and buried seventeen men beneath it. Five of them were killed, while the other twelve were dug out, all more or less injured. The mill, boarding house and several cabins were broken down and partly carried away by the slide
The Grizzly Bear, Volume 22, March 1918, page 233
by Thomas R. Jones
(March, Fifty Years Ago, in California, compiled expressly for The Grizzly Bear)
Santa Fe weekly gazette. (Santa Fe, N.M.), 02 May 1868. Chronicling America: Historic American Newspapers. Lib. of Congress.