1900
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1900
September - Major hurricane hits Galveston. The "Great Galveston Storm" is the worst natural disaster to date in U.S. history. Loss of life reported to be 6,000 to 8,000 citizens. Harris County experiences widespread flooding, with property damage at $30 to $40 million.
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1907
Major storm floods much of Houston and Harris County.
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1908
First drainage district created in Harris Conty in Brays Bayou watershed.
1910
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1911-1914
Houston Ship Channel construction begins.
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1913
December - Major Brazos River storm spreads to Harris County. Entire area is hard hit. Buffalo, White Oak, Brays and Greens Bayous are all out of banks. Many citizens evacuate.
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1914
Houston Ship Channel opens.
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1915
August - Another Galveston hurricane causes major damages throughout Harris County. Buffalo Bayou and widespread areas of Houston experience heavy flooding. Damage estimated at $56 million.
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1916
The United States Geological Survey publishes topographic maps for Harris County.
1920
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1929
April - Enormous gulf storm descends on Houston and Harris County and lasts 14 hours. Many areas of county report rainfall close to 10 inches. Extensive damage sustained to structures in almost all of Harris County. All bayous are reported to be out of banks.
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1929
May - As the area is still reeling from the last storm, another major storm hits Harris County. Structural damage, heavy street flooding and widespread crop damage reported. San Jacinto River 30 feet above normal.
1930
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1930
May - Large rainstorm cell remains stationary over Harris County for 3 days. Rainfall amounts reported as high as 12.5 inches. Entire area averages 8 inches.
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1932
August - Hurricane hits Freeport, taking 40 lives. Harris County has widespread flooding on all bayous.
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1935
December - Massive storm inundates Houston and Harris County. Buffalo Bayou 52 feet above normal. Overwhelming devastation leads to creation of the Harris County Flood Control District in 1937.
1940
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1940
November - Heavy rains last for 5 days in Northeast Harris County. 10,000 head of cattle lost.
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1943
July - Hurricane near Galveston creates extensive flooding for Harris County. $16.5 million in damages.
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1943
October - Hurricane near Freeport. More than 11,000 structures flood in Harris County.
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1945
August - Area hurricane produces heaviest rainfall ever recorded in Harris County. More than 15 inches in 24 hours. Flooding reported on all bayous.
1950
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1950
February - Thunderstorm precedes cold front, resulting in Greens Bayou running out of bans. Area residents evacuate. Baytown also reports flooding.
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1955
May - Major thunderstorm hits northern portion of Harris County. Structure flooding reported in the area.
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1957
June - Hurricane Audrey crosses the Louisiana/Texas coast. Flooding is reported in Harris County.
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1959
October - Thunderstorm floods more than 100 structures in Houston area.
1960
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1960
June - Thunderstorm inundates many area throughout Harris County. Cypress Creek, Spring Creek and San Jacinto River experience flooding. Over 200 families evacuate.
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1961
September - Hurricane Carla pounds the Gulf Coast, taking 34 lives. It is the largest hurricane ever recorded, with property damages exceeding $300 million. Heavy flooding reported in Southern Harris County.
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1969
February - Thunderstorm precedes cold front, flooding more than 250 area structures. Damages exceed $3.3 million.
1970
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1972
March - Thunderstorm precedes cold front and floods much of northern Harris County. More than 700 families evacuate.
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1973
Major storm hits Harris County and bring 10-15 inches of rain. Sims and Greens bayous are reported out of banks. 10 lives are lost and damages exceed $50 million.
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1979
July - Tropical Storm Claudette brings record rainfall amounts to the area. A U.S.-record of 43 inches of rain in 24 hours falls in Alvin. Total damages exceed $700 million.
1980
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1983
May - Large thunderstorm floods areas along several bayous. Damages exceed $14 million.
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1983
August - Hurricane Alicia strikes Galveston and Harris County. Damages approach $1 billion, mostly due to wind.
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1983
September - Nine inches of rain falls south of downtown. More than 1,000 structures flood along Brays Bayou. Damages top $38 million.
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1984
October - Thunderstorm in northern Harris County floods more than 200 structures. Total damages exceed $32 million.
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1989
May & June - Two separate storms result in two back-to-back presidential disaster declarations.
1990
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1992
March - Major storm floods more than 1,500 structures and many bayous are out of banks. Much of I-10 is under water.
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1994
October - Major storm hits Harris County. Twice as many structures flood than in the 1992 storm.
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1998
September - Tropical Storm Francis causes extensive flooding along White Oak Bayou and other bayous. More than 1,300 structures flood.
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1998
October & November - Adding insult to injury, two more major storms flood hundreds more structures, mainly in north Harris County.
2000
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2001
June - Tropical Storm Allison strikes first on June 5; returns three days later for a second round of storms. Texas Medical Center essentially shut down. North Downtown Houston decimated. Two million people impacted; 22 lives lost. More than 70,000 structures flood. Damages top $5 billion.
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2006
June 19 - Rainfall on already saturated ground floods 3,370 homes, 561 apartments and one nursing home, mostly along Berry and Sims bayous. Rainfall 8-10 inches in three hours.
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2008
September - Hurricane Ike, 3rd costliest in U.S. history, strikes Galveston Island. Eleven deaths in Harris County. Storm surge swamps 2,500 structures; rainfall causes 1,200 more structures to flood. More than $28 billion in damage.
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2009
April 17-28 brings extensive flooding; five children drown when a car goes into a Greens Bayou tributary. Some highways close; record high water on Bear, Langham, Mayde creeks. 2,305 structures flood on Langham Creek and Buffalo Bayou. HCFCD records one-hour rainfall of 6.9 inches at Clear Creek.
2010
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2012
July - High water rescues along Cypress, Little Cypress and Willow creeks after several days of heavy rainfall beginning July 9. More than 70 structures flood in northern Harris County.
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2014
August - Slow-moving rains drench portions of Harris County with 3.5-4.5 inches. In the Greens Bayou watershed, 109 structures flood.
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2015
May 25-27 - Memorial Day Flood. More than 6,000 structures flood. Seven fatalities. Highest rainfall recorded in Buffalo and Brays watersheds. Nearly 11 inches in 3 hours in Brays Bayou.
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2016
April 17-18 - Tax Day Flood. HIstoric flood over northern and western Harris County results in seven fatalities. Average 12-16 inches of rain in 12 hours countywide; record pool levels in Addicks and Barker reservoirs. Estimated 9,820 structures flood in Harris County.
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2016
May 26-27 - Memorial Day Flood. North and northwest Harris County hit with 8-13 inches of rain. Overbank and structural flooding along Spring, Willow, Little Cypress and Cypress creeks, San Jacinto River. More than 400 structures flood in Harris County and more than 900 in the Spring Creek watershed in Montgomery County.