Christmas flood of 1964
|Areas affected||California, Oregon, and Washington states|
The Christmas flood of 1964 was a major flood that took place in the Pacific Northwest and California between December 18, 1964 and January 7, 1965, spanning the Christmas holiday. Considered a 100-year flood, it was the worst flood in recorded history on nearly every major stream and river in coastal Northern California and one of the worst to affect the Willamette River in Oregon. It also had an impact on parts of southwest Washington, Idaho, and Nevada. In Oregon seventeen people died as a result of the disaster, and it caused hundreds of millions of dollars in damage. The flooding on the Willamette covered 152,789 acres (61,831.5 ha). The National Weather Service rated the flood as the fifth most destructive weather event in Oregon in the 20th century. California Governor Pat Brown was quoted as saying that a flood of similar proportions could "happen only once in 1,000 years," and it was often referred to later as the Thousand Year Flood. The flood killed 19 people, heavily damaged or completely devastated at least 10 towns, destroyed all or portions of more than 20 major highway and county bridges, carried away millions of board feet of lumber and logs from mill sites, devastated thousands of acres of agricultural land, killed 4,000 head of livestock, and caused $100 million in damage in Humboldt County, California alone.
An atypical cold spell began in Oregon on December 13, 1964, froze the soil, and was followed by unusually heavy snow. Subsequently, a Pineapple Express storm brought persistent heavy warm rain. The temperature increased by 30 to 40 °F (17 to 22 °C change). This melted the snow, but left the soil frozen and impermeable. Some places received the equivalent of a year's rain in just a few days. Albany received 13 inches (330 mm) of rain in December, almost double its average rainfall of 7 inches (200 mm). Detroit recorded an extra 18 inches (460 mm) of rain, and at Crater Lake, where the average normal December rainfall is 12 inches (300 mm), there was over 38 inches (970 mm) of rain. As rivers and streams overflowed and the soil became saturated, reports of mudslides, closed roads and reservoirs filled over-capacity came from throughout the state. Many towns were isolated. By the end of the flood, every river in Oregon was above flood stage and more than thirty major bridges were impassable.
Heavy warm rain and melting snow caused more flooding in late January 1965, after the waters had begun to recede from the December flood. More mudslides occurred in places that had withstood the December flooding, and there were more deaths. Many streams in the northern San Joaquin Valley reached higher flows than they had in December.
Impact and aftermath
The Christmas flood of 1964 was "the most severe rainstorm to ever occur over central Oregon, and among the most severe over western Oregon since the late 1870s", according to the National Weather Service office in Portland.
Some of the worst mudslides occurred in the Mount Hood Corridor, and one man died in a mud and debris avalanche near Rhododendron that destroyed 15 houses. Other deaths occurred from drowning and electrocution, and one man died when the new John Day bridge collapsed.
On the Oregon Coast, downtown Reedsport was flooded with 8 feet (2.4 m) of water, and in Coos Bay, a massive logjam contributed to severe flooding. The ports at Gold Beach and Brookings were destroyed.
At Oregon City, Willamette Falls was unrecognizable as a waterfall, and the city was flooded by several feet of water. In Portland, the lower deck of the Steel Bridge was underwater and had also been hit by a log raft consisting of around 1,000 logs. The impact of the raft severely damaged the Hawthorne Bridge, closing it for a year. At 12 feet (3.7 m) above flood stage, the flooding of the Willamette River at Portland in 1964 was second only to the 1948 flood that wiped out Vanport City. At its peak, the water was at the top of Downtown Portland's seawall.
Starting on December 21, intense downpours all across Northern California caused numerous streams to flood, many to record breaking levels. California Governor Brown declared 34 counties in the region disaster areas. Together, Del Norte, Humboldt, Mendocino, Siskiyou, Trinity, and Sonoma counties sustained more damage than the other 28 counties combined. Twenty-six U.S. Geological Survey (USGS) stream gages were destroyed.
The Eel, Smith, Klamath, Trinity, Salmon, and Mad rivers, as well as other rivers and large streams, all went well beyond flood stage and peaked nearly simultaneously around December 21 and 22, breaking previous records (especially those set in the "hundred year" flood of 1955 in most cases). Sixteen state highway bridges were destroyed in California's 1st congressional district, most of them on Highway 101, and another ten county bridges were destroyed in Humboldt County. The flood devastated the tracks and multiple stream and river crossings of the Northwestern Pacific Railroad, the region's only major railroad, and related spur lines.
Many communities of Del Norte and Humboldt counties suffered massive power outages and were left isolated (or completely cutoff from the rest of the state for a period), including the region's larger populated areas around Humboldt Bay, such as Eureka and Arcata, despite the fact that those cities were located on higher ground and not in the path of raging rivers. Unfortunate riverside communities like Klamath, Orleans, Myers Flat, Weott, South Fork, Shively, Pepperwood, Stafford, and Ti-Bar were all completely destroyed by flood waters, some of which were never rebuilt and none regained their former status. Metropolitan, Rio Dell, and Scotia were significantly damaged. Crescent City, still recovering from the tsunami created by the 1964 Alaska earthquake only nine months earlier, also suffered from the floods.
Over 22 inches (550 mm) of rain fell on the Eel River basin in a span of two days. By December 23, 752,000 cubic feet per second (21,300 m3/s) of water rushed down the Eel River at Scotia (still upstream from the confluence of the Van Duzen River), 200,000 cubic feet per second (5,660 m3/s) more than the 1955 flood, and more than the average discharge of the entire Mississippi River basin. Just under 200,000 cubic feet per second (5,660 m3/s) of water flowed down the South Fork Eel River alone, causing severe damage along its entire length. Every single stream gage on the Eel River was destroyed. The flood crest at Miranda was 46 feet (14 m). Signs were later placed on top of tall poles to mark the unusual height of the water.
The Smith River, located in Del Norte County near the Oregon border, reached flows of 228,000 cubic feet per second (6,460 m3/s) at Hiouchi, easily surpassing the 1955 flood's previous record of 165,000 cubic feet per second (4,670 m3/s). The town of Gasquet received 26.6 inches (676 mm) of rain over an eight-day period, and Crescent City received 9.2 inches (230 mm).
One of the Klamath's largest tributaries, the Trinity River, also flooded and wrought destruction along its length. The Trinity, however, did not break the 1955 flood's records because of the newly constructed Trinity Dam, which stored 372,200 acre feet (459,100,000 m3) of runoff from the storm. Nonetheless, an impressive 231,000 cubic feet per second (6,540 m3/s) of water rushed down the river at Hoopa.
Between December 20 and December 26, a staggering 10,390,000 acre feet (12.82 km3) of water flowed into the Pacific Ocean from the combined rivers and streams on the North Coast.
Central Valley and beyond
In the Central Valley, the Yosemite Valley was flooded, and residents of Yuba City were evacuated. Many streams reached record flood stages, including the Feather River, Yuba River, American River, Cottonwood Creek, and Butte Creek. The flood caused the uncompleted Hell Hole Dam on the Rubicon River to fail, sending even more water downstream. In total, 375,000 acres (152,000 ha) of the Central Valley was flooded.
In southwest Washington, rising rivers threatened Centralia and Longview–Kelso and closed Interstate 5 and all railways at flooded Kalama for over a week. In Nevada, the Truckee River threatened Reno.
- Lucia, Ellis (1965). Wild Water: The Story of the Far West's Great Christmas Week Floods. Portland, Oregon: Overland West Press. OCLC 2475714.
- "Lower Columbia River Basin" (PDF). United States Army Corps of Engineers. Retrieved December 31, 2010.
- Dresbeck, Rachel (2006). "The Willamette River Flood". Oregon Disasters: True Stories of Tragedy and Survival. Guilford, Connecticut: Insiders' Guide. pp. 89–96. ISBN 978-0-7627-3993-6. OCLC 69680034.
- Gregory, Stan; Ashkenas, L.; Jett, S.; Wildman, R. (2002). "Flood Inundations/FEMA Floodplains" (PDF). Willamette River Basin Planning Atlas (2nd ed.). Corvallis, Oregon: Oregon State University Press. p. 28. ISBN 978-0-87071-542-6. OCLC 50591046. Retrieved December 31, 2010.
- "Oregon's Top 10 Weather Events of 1900s: Floods of December 1964 to January 1965". Portland, Oregon: National Weather Service Forecast Office. Retrieved December 31, 2010. Note: Surpassed only by the Heppner Flood of 1903, the Vanport Flood of 1948, the Columbus Day Storm of 1962, and the Tillamook Burn of 1933, 1939, 1945, and 1951.
- "11477000 Eel River at Scotia, California" (PDF). United States Geological Survey. pp. 11–1–11–2. Retrieved July 18, 2011.
- California Department of Water Resources (January 1965). Flood! (161). Sacramento, California: California Department of Water Resources. OCLC 8135568. Retrieved July 26, 2011.
- "1964 Christmas Flood". Oregon Department of Transportation. Retrieved December 31, 2010.
- Kammerer, J.C. (May 1990). "Largest Rivers in the United States". United States Geological Survey. Retrieved July 18, 2011.
- "The Eel River Floods of 1955 and 1964". California Department of Parks and Recreation. Retrieved December 14, 2011.
- "11532500 Smith River Near Crescent City, CA" (PDF). United States Geological Survey. 2005. Retrieved July 27, 2011.
- "11530500 Klamath River Near Klamath, CA" (PDF). United States Geological Survey. 2005. Retrieved July 27, 2011.
- "11530000 Trinity River At Hoopa, CA" (PDF). United States Geological Survey. 2005. Retrieved July 27, 2011.
- History of the Christmas week flood from Salem Public Library
- The '64 flood story from Mail Tribune
- Images of the 1964 flood from Salem Public Library
- Images of the 1964 flood in Corvallis from the University of Oregon Library digital archives
- Images of the 1964 Eel River Flood near Van Arsdale Reservoir from the Potter Valley Irrigation District