Floods in the United States (1900–1999)

[2] The third deadliest flash flood in US history, the normally placid Willow Creek burst its banks during an intense rain and hail storm.

[1] In May, very heavy rains in northern Colorado and southern Wyoming caused a flood on the Cache la Poudre and Crow Creek which resulted in the loss of considerable property along them.

A tropical storm in late 1906 reported highest ever rainfalls in a southeast to northwest direction from Monterey to Ione in the Sierra Nevada foothills.

[6] Snowmelt combined with heavy rains by March 16 allowed the Allegheny, Monongahela, and Ohio rivers to swell out of their banks, leading to a flood of record in Pittsburgh.

[6] Heavy rains filling the Bayless reservoir cracked the concrete dam, sending an estimated 450,000,000 gallons downstream, and destroying most of the boroughs of Austin and Costello.

Storm-related flooding affected more than a dozen states: Alabama, Arkansas, Connecticut, Illinois, Indiana, Kentucky, Louisiana, Maryland, Massachusetts, Mississippi, Missouri, New Hampshire, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Tennessee, Vermont, and Virginia.

[18] During early 1916, heavy rains caused floods throughout Southern California, virtually cutting off San Diego County from the rest of the state for the greater part of a month.

The massive Red Cross relief effort was directed by then Secretary of Commerce Herbert Hoover, which later catapulted him into the presidency and made the New Deal a reality within the next decade.

The dam's failure was attributed to design errors that did not take into account the poor foundation rock in the canyon and the resulting hydraulic uplift due to overfilling the reservoir.

Cincinnati experienced a double disaster as 10 or more gas tanks exploded on "Black Sunday", January 24, which led to oil fires on the Ohio and in Mill Creek Valley.

[44] The 1945 flood of the Ohio River was the second-worst in Louisville, Kentucky, history after the one in 1937 and caused the razing of the entire waterfront district of the neighborhood of Portland.

Shortly before midnight July 13, the Kansas River broke the levee protecting the Argentine district, and residents were forced to flee to nearby bluffs.

[6] The Good Friday earthquake caused a tsunami in March 1964, which completely devastated the downtown district of Crescent City on the North Coast, resulting in 11 deaths and an economic loss of $14 million in Del Norte County alone.

Substantial damage and numerous deaths also occurred in the towns of Valdez, Whittier, Chenega, Seward, Kodiak, Kalsin Bay and Kaguyak, Alaska, and Port Albini, British Columbia.

On December 18, dramatically warmer conditions coupled with nearly a 300 mm (0.98 ft) of rain led to excessive snow melt in the western Cascades.

Recent construction of Canyon Dam located twenty five miles upstream gave residents a false impression that they would be secure from any flooding.

[59] The Rapid City Public Library hosts a more comprehensive digital archive of flood-related stories, photos and news accounts on their 1972 flood page.

[64] An estimated 400 mm (16 in) of rain[65] caused the banks of Brush Creek to overflow into the Country Club Plaza area on the night of September 12, 1977.

The maximum rainfall total in Texas occurred in Medina, where 1,219 mm (48.0 in) of rain was deposited due to mesoscale convective systems firing along a frontal boundary induced by Amelia's remnant circulation aloft.

President Ronald Reagan declared Cochise, Gila, Graham, Greenlee, Pima, Pinal, Santa Cruz and Yavapai counties a "major disaster area".

Aggressive sandbagging managed to divert the flood waters to other underground rivers via State Street, but temporary pedestrian bridges were needed for several weeks.

The Great Salt Lake in succeeding years reached a record high water level, flooding Saltair and other areas and causing traffic problems on I-80.

The heavy rains also loosened soils in the Wasatch Range, causing a massive landslide which temporarily dammed the Spanish Fork (river), drowning the town of Thistle (which was never rebuilt following the floods).

[79] The U.S. Army Corps of Engineers reported that three people died due to flooding and the area sustained hundreds of millions of dollars in damage.

After Juan passed by, an occluded system moved slowly northward from the Gulf of Mexico through the Mid-Atlantic States during the first days of November, leading to significant rainfall for the central Appalachians.

[6] Linda, about 65 km (40 mi) north of Sacramento, was devastated after the levee broke on the Yuba River's south fork, forcing thousands of residents to evacuate.

[4] The largest and most destructive flood in the history of the Androscoggin River in Maine occurred due to four days of rain combined with melting snow and ice flows.

The South Branch of the Potomac, as well as the Cheat and Monongahela rivers in West Virginia and Pennsylvania experienced their highest levels since early November 1985, which was the flood of record for the region.

During the spring thaw, this creates problems as it is usually colder in southern Canada, which makes ice jam flooding a major concern for this river basin.

South of Fort Collins, new thunderstorm development began around 10 pm, which spread north through the city, dumping another 12 mm (0.47 in) of rain before dissipating.