U.S. Floods of 1983
By C.A. Perry, B.N. Aldridge, and H.C. Ross of the USGS
The first significant floods of 1983 occurred in California. Severe
storms originating in the Pacific Ocean frequently hit California from
January through March. Landslides were the most damaging aspect of the
storms, but floods played an important part as well. On January 22 through
January 29, a series of intense storms moved rapidly through the
northeastern Pacific Ocean and struck the California coast with intense
rains, gale-force winds, high surf, and high tides. Riverine flooding from
these storms in the San Francisco Bay area produced record flooding.
Severe thunderstorms originating along the central coast of the Gulf of
Mexico produced flood conditions for Louisiana and Mississippi on April 5.
Rainfall was especially excessive over the Pearl River Basin in Louisiana.
The Pearl River crested above flood stage through most of its length on
April 7 and stayed above flood stage through the end of April. In southern
Mississippi, 8 to 14 in. of rain fell on April 5, and many creeks and
rivers in this region experienced maximums of record. Additional rains on
April 6 caused severe flooding on Gordon Creek and the Bouie River.
Intense rainfall on April 28 through April 30 produced widespread
flooding throughout Kentucky, but the most severe flooding was
concentrated in the western part of the State. The rains and flooding
lasted through May 4. Rainfall averaged 6 to 10 in. across most of the
State. Small streams began flooding April 30, and by May 4, larger streams
also had reached flood stage.
The winter of 1982-83 was among the most severe in Wyoming, Colorado,
Utah, Nevada, and parts of other Western States since records began. Wet,
cold weather with large accumulations of snow continued through April. A
record snowpack resulted from the extended winter weather and lingered
until May or early June. Temperatures stayed cold longer than normal and
when they began to rise, it was a sharp and rapid increase. Several events
resulted from these conditions-(1) High-magnitude streamflow, both in
terms of volume and maximum discharges, occurred in most of these Western
States; (2) the first required use of spillways at Hoover and Glen Canyon
Dams on the Colorado River; (3) long-duration flooding along the lower
Colorado River; (4) devastating landslides and debris flows in Utah and
Nevada; and (5) the highest water level since 1924 in the Great Salt Lake.
Significant floods occurred in southeastern Arizona from September 27
to October 3. The floods were caused by the remnant moisture from
dissipating Tropical Storm Octave. The most intense rainfall was
concentrated in a narrow band from south of Tucson to Clifton. Large, flat
areas northwest of Tucson were inundated with floodwaters when the Santa
Cruz and Gila Rivers overtopped their banks and spread across the flood
Significant floods on October 17-23 occurred in southwestern and
central Oklahoma. The floods were caused by remnant moisture from
Hurricane Tico. The most intense rainfall was concentrated in a narrow
band from Rush Springs to Shawnee. Record maximum discharges were recorded
on Deep Red Run, the lower Washita River, and Elk and Walnut Creeks.
Damages were estimated at $12 million.