Flooding
The lower and middle sections of the Klamath River are vulnerable to flooding, and major floods have occurred in years where major flooding has taken place in Northern California, particularly in the wake of Pineapple Express storms that bring large amounts of warm rain to Northern California. Significant floods on the Klamath River have occurred in 1926–1927, 1955, 1964, 1997, and 2005, in several cases changing the course of the river. The Christmas flood of 1964 was particularly devastating, with a high water reaching 55 feet (17 m), inundating the towns of Klamath and Klamath Glen and destroying most of the Highway 101 bridge crossing the river. The highway bridge was rebuilt in a different location, though entrances to the old bridge still stand.
The mouth of the Klamath and nearby sections of the river are susceptible to oceanic tsunami surges, and fatalities have occurred there during the 1964 and 2011 Pacific tsunamis.
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