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Purpose and Scope Study Area  Study Approach   Acknowledgments   Data Analyses Streamflow and Climate Data  Trend Tests  Double-Mass Curve Comparisons1 Precipitation1 Nearby-Basin Runoff1 Computed Runoff  1 Two-Sample Tests 1 Potential Effects of Land-Use Activities on Streamflow 1 Irrigation and Drainage1 Timber Harvest2 Summary  References Cited FIGURES 1.– 2. Maps showing: 1. Location and extent of study area and locations of U.S. Geological Survey streamflow-gaging stations and National Weather Service precipitation gages, Upper Klamath Lake Basin, Oregon  3 2. Mean annual precipitation in the Upper Klamath Lake Basin, Oregon (1961–90) 4 3.–19. Graphs showing: 3. Annual runoff for the Williamson River below Sprague River, Oregon, water years 1918–96 6 4. Monthly runoff statistics for the Williamson River below Sprague River, Oregon, water years 1918–96 7 5. Monthly runoff statistics for the Sprague River, Oregon, water years 1922–96  7 6. Monthly computed runoff statistics for the upper Williamson River above the Sprague River confluence, Oregon, water years 1922–96  7. Annual precipitation, water years 1902–96, and cumulative annual precipitation, water years 1914–96, for Klamath Falls, Oregon 9 8. Comparison of (A) annual precipitation at Klamath Falls with annual precipitation at Crater Lake and (B) cumulative annual precipitation at Klamath Falls with cumulative annual precipitation at Crater Lake, Oregon, water years 1931–96  11 9. Comparison of Williamson River (11502500) cumulative annual runoff to Klamath Falls, Oregon, cumulative annual precipitation and Sprague River (11501000) cumulative annual runoff to Klamath Falls, Oregon, cumulative annual precipitation, water years 1928–96 11 10. Comparison of cumulative annual runoff for the Williamson River, Oregon (11502500), with cumulative annual runoff for the Big Marsh Creek, Oregon (14061000), water years 1928–58, and cumulative annual runoff for the Rogue River, Oregon (14328000), water years 1928–96 12 11. Comparison of cumulative annual runoff for the Rogue River, Oregon (14328000), with cumulative annual runoff for Salmon Creek, Oregon (14146500), water years 1934–93, and cumulative annual runoff for Big Marsh Creek, Oregon (14061000), water years 1928–5813 12. Comparison of cumulative runoff for the Williamson River, Oregon (11502500), with cumulative runoff for the Rogue River, Oregon (14328000), February–May and July–September, water years 1924–96 14 13. Comparison of cumulative observed annual runoff with cumulative computed annual runoff for the Williamson River, Oregon (11502500), and cumulative residuals, water years 1918–96  15 4/8/99—11:12:25 III RISLEY/KLAMATH NUTRIENTLOADING/TOC.DOC UNPUBLISHED REPORT SUBJECT TO REVISION—DO NOT QUOTE OR RELEASE—FOR USGS USE ONLY

Upper Klamath Lake Basin nutrient-loading study: Assessment of historic flows in the Williamson and Sprague rivers