Glendale (PDF) - Hazard Mitigation Web Portal - State of California

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Natural Hazards Mitigation PlanCity of Glendale, CaliforniaSection 8 – FloodsSimilarly, the winter storms in 1983-84 caused considerable damage in southern California, andmay have also washed out the gage.The City of Glendale most recently experienced some destruction during the 2005 floods.Residents and business owners who were impacted by flooding and the rain storms were able toreceive disaster assistance through the Federal Emergency Management Agency and the City.On February 4, 2005, President Bush declared that a major disaster existed in California andordered Federal aid to supplement State and local recovery efforts.Historic Flooding in Los Angeles County:There are several rivers in the southern California region, but the river with the best-recordedhistory is the Los Angeles River. The flood history of the Los Angeles River is generallyindicative of the flood history of much of southern California. Records show that since 1811, theLos Angeles River has flooded 30 times, roughly about once every 6 years. But averages aredeceiving, for the Los Angeles basin goes through periods of drought and then periods of aboveaveragerainfall. For example, between 1868 and 1884, a period of 16 years, there were nomajor floods, but this was followed by a series of wet years with floods in 1885, 1886, 1889 and1891. A similar cluster of wet years was recorded in the 1990s, as discussed above.Year1770-17711771-17721775-17761779-1780Table 8-1: Historical Floods in Los Angeles CountyCommentsGreat flooding on the L.A. River recorded by Father Juan Crespi. River overflowed itschannel.Flooding recorded by Spanish Mission Fathers. San Gabriel Mission crops destroyed.Due to heavy flooding, San Gabriel Mission was moved about 6 miles back from the river.Flooding recorded by Spanish Mission Fathers. Flows filled riverbed and flooded the lowlandswhere wheat and barley had been planted.1811 Flooding reported, although records are sparse.1815 Flooding washes away the original Plaza in L.A. River changes course at Alameda and 4 thStreet to cut west and join Ballona Creek. From there it emptied into Santa Monica Bay.1822 A great flood on the L.A. River “covered all the lowlands and reached a greater height thanwas ever known before.”1824-25The greatest of the earlier recorded floods. L.A. River changed its course back from theBallona wetlands to San Pedro. Before this storm, the river would spread over the entire area,filling depressions at the surface and forming lakes, ponds and marshes, rarely discharging itswaters into the sea. The 1825 floods cut a riverway to the ocean, draining the marshlands andcausing the forests to disappear.1832 Heavy flooding caused the drainage near Compton to change so that many lakes and pondsthat “had been permanent, became dry a few years thereafter.” Drainage of these ponds andlakes completed the destruction of the forests that used to cover a large part of southern L.A.County.1849 –1860Floods of various magnitudes occurred in 1849-1850, 1851-1852, and 1859-1860.2006 PAGE 8- 5
Natural Hazards Mitigation PlanCity of Glendale, CaliforniaSection 8 – FloodsYear1861-621867-68CommentsThe “great flood” or the “Noachian deluge of California.” Fifty inches of rain fell duringDecember and January. The entire valley from Los Angeles to the ocean was a great lake.Part of the river split and drained into Ballona Creek. San Gabriel River also overflowed itsbanks and started a new channel.Floods spill over river channel and create a large, temporary lake out to Ballona Creek. SanGabriel River breaks out of its channel and washes thousands of acres of land.1884 Two periods of intense rainstorms separated by 6 to 8 days. The first storms caused littledamage. The second washed all but one of the bridges across the L.A. River, washed awaymany houses, and drowned several people. Parts of Los Angeles flooded 3 to 4 feet deep.1886-87A good part of Los Angeles was inundated. The levees were damaged and railwaycommunication was impossible for 2 to 3 weeks.1889 Flood on Christmas Day caused much damage; bridges and levees washed away; the old SanGabriel, new San Gabriel and L.A. Rivers joined near Downey and formed one body. L.A.River overtopped its channel.1914 Heavy flooding in January and February. Great damage to L.A. harbor.1916-1938Flooding in 1916. Minor floods causing damage in certain areas reported in 1918, 1921-1922,1926, 1927, 1931, 1932, 1934, 1936, and 1937.1934 Moderate to severe flooding starting January 1. Over 40 dead in La Cañada – Glendale area.Debris flow killed 12 people who had taken shelter in the Montrose Legion Hall.1938 Series of storms beginning December 1937. March floods exceeded all previous floods forwhich records were available. Large tracts inundated; bridges, highways and railroadsseverely damaged. 87 people killed, over $78 Million (1938 dollars) in damage.1941-1944Los Angeles River floods five times.1952 Moderate flooding.1969 Recurrent precipitation during January and February nearly approached the largest totalsince 1884. Nearly 40 people died as direct result of the floods in southern California, andmore than 10,000 had to be evacuated.1978 Two moderate floods.1979 Los Angeles experiences severe flooding and mudslides.1980 Flood tops banks of river in Long Beach. Sepulveda Basin spillway almost opened.1983 Flooding kills six people.1992 15-year flood. Motorists trapped in Sepulveda basin. Six people dead.1994-19951997-982003-20042004-05Heavy flooding throughout the State. The total damages are estimated at $2 billion.The 1997 floods caused extensive damage in 48 California counties, including Los AngelesCounty. Total damages were estimated at $1.8 billion. The 1998 El Niño storms also causeddamage, but this was less than it could have been because many had taken measures to reducetheir risk following the 1997 storms.The rains followed the extensive fires of 2003; in many areas, canyons chocked with ashes anddebris caused debris flows that did substantial damage downstream.The second-wettest year on record in the Los Angeles Basin; the rains caused extensivedamage in some areas, triggering landslides and debris flows.2006 PAGE 8- 6
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NOTES:This map is intended for gene
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City of GlendaleUpdateHazard Mitiga
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Similar to Safety ElementIncludesEa
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HospitalsPartnershipsWithin City an
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Impact on CityMost significant area
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