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Floods of November 1996 through January 1997 in the Umpqua River Basin, OregonFloods of November 1996 through January 1997 in the Umpqua River Basin, OregonBy John C. Geological Survey Fact Sheet 2004-3134Prepared in cooperation with the USDA Forest Service, the Bureau of Land Management,and the Oregon Water Resources DepartmentPrinted copies of this Fact Sheet are available from the U.S. Geological Survey,10615 SE Cherry Blossom Dr., Portland, OR 97216. E-mail,phone (503) 251-3201.

Request USGS Fact Sheet 2004-3134.This document is also available as a (0.7 MB), which gives better resultswhen printing the report. (Requires Adobe Reader®.

FromAdobe Systems, Inc.)BackgroundDuring November 1996 through January 1997, a series of storms caused flooding throughout southeastern Oregon, northern California, and parts of Nevada. In Oregon's Umpqua River Basin (fig. 1), the most significant flooding occurred on November 18-19, December 4-9, and January 1-2. The combination of heavy rains, snowmelt, saturated soils, and flooding also resulted in debris flows and landslides.

Four people were killed by a debris flow on November 18, 1996, near Rock Creek, a tributary to Hubbard Creek near Millwood. Over the 3-month period, flooding and land disturbances caused over $11 million in damage to public and private property within the Umpqua River drainage basin (Mikeal Jones, U.S.

Forest Service, Umpqua National Forest, Roseburg, Oregon, written commun., 2004; Lowell Duell, U.S. Bureau of Land Management (BLM), Roseburg District, Roseburg, Oregon, written commun., 2004; Wayne Stinson, Douglas County, Sheriff's Office, Roseburg, Oregon, written commun., 2004). The Umpqua National Forest and Oregon State highways within Douglas County incurred over $4 million and $3 million in damage, respectively. Damage to BLM lands, local municipal infrastructure, and private property were each over $1 million. Map showing the locations of selected stream-gaging and meteorological stations in the Umpqua River Basin, Oregon. (Stream-gaging-station site numbers refer to table 2.)November FloodsFlooding on November 18-19 was caused by heavy rains that fell on many locations throughout the Umpqua River Basin (table 1).

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The rains resulted from the convergence of a broad upper-air weather system of moist subtropical air, which originated over the tropical Pacific, and a cold-air mass over Washington (fig. Roseburg received a record 4.35 inches of rainfall in a single day, which surpassed the previous record of 3.28 inches set in 1965.

Prior to the storm, soil moisture and precipitation levels throughout the basin were already above average. October 1996 precipitation amounts at Drain, Roseburg, Riddle, and Toketee Falls were 178-215 percent of average.Most of the precipitation during the period of November 17-19 was rainfall. Air temperature and snowpack data collected at the King Mountain and Diamond Lake snow telemetry (SNOTEL) stations indicated that there was no significant snow accumulation. These stations, operated by the U.S. Department of Agriculture Natural Resources Conservation Service, are located at 4,000 and 5,200 feet elevation, respectively. Because the storm event occurred prior to the winter season and there was no preexisting snowpack at either of these two stations, snowmelt did not provide a significant contribution to the flooding.Although precipitation from the November 17-19 storm was broadly distributed over the entire Umpqua River Basin, flooding in the North Umpqua River Basin was more severe than flooding in the South Umpqua River Basin (table 2), possibly due to differing antecedent conditions. The recurrence interval for the November peak discharges within the entire basin ranged from less than 2 years to more than 50 years.

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A 50-year flood has a magnitude that would be expected to occur every 50 years, on average. Such a flood has a 2 percent chance of being equalled or exceed in any given year. The November flood for Boulder Creek near Toketee Falls (14316495) had an unusually high magnitude in comparison to the other basins. The event had a greater than 50-year recurrence and a unit discharge of 372 cubic feet per second per square mile.

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