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This report presents a method for determining the probable magnitude of floods of any frequency between 1.1 and 50 years on any stream, gaged or ungaged, draining more than 0.5 square mile in the western part of the region or more than 10 square miles in the eastern part of the region. Following the presentation of methods used to determine flood frequency is a section containing a compilation of flood discharge records for all stream-gaging stations having 5 or more years of annual peak record, and peak stages for selected longterm stage stations. The list for most stations contains all floods above a selected base discharge; for some, only annual peaks are shown. The region covered by this report comprises the Pacific slope basins in Oregon and the Columbia River basin below the Snake River. Using individual frequency curves for all gaging stations having 5 or more years of unregulated annual flood record, areas of similar flood-frequency characteristics are outlined into nine homogeneous flood regions. Composite frequency curves developed for each region express the relation between frequency and the ratio of the flood of that frequency to the mean annual flood. Basin characteristics are correlated with mean annual floods, and two equations are derived: one for the area east of the Cascade Range, and one for the area west of the range. The equations can be used to compute the mean annual flood for any natural, unregulated stream within the report area, with limitations and probable accuracy as discussed in the report.

Magnitude and frequency of floods in the United States: Part 14. Pacific slope basins in Oregon and lower Columbia River basin