AbstractINTRODUCTIONFigure 1. Selected streamflow and temperature monitoring sites in the Klamath and Rogue River Basins.UPPER KLAMATH LAKE INFLOWS AND LAKE WATER LEVELSTable 1. September Flow Conditions in the Klamath and Trinity River BasinsTable 2. Recent and long-term annual precipitation at Crater Lake, Oregon1UPPER KLAMATH LAKE OUTFLOWSDIVERSIONS FROM THE TRINITY RIVER BASINFLOWS IN THE MIDDLE AND LOWER KLAMATH BASINFigure 2. Relation between average flows for September 1-24, 2002, and for the 1960 to 2002 September period of record at locations along the Klamath River.GROUND-WATER CONDITIONS IN THE UPPER KLAMATH BASINFigure 3.Water-level hydrograph from a USGS observation well in the Upper Klamath Lake Basin, Oregon. The steady decline of the ...Table 3. Estimated October mean ground-water discharge above and below the John C. Boyle Reservoir on the Klamath River and from the Spring Creek area near Chiloquin, Oregon, 1999-2002WATER TEMPERATURETable 4. Recent and long-term daily maximum water temperature conditions on the Rogue River near Agnes, OregonTable 5. Recent and long-term daily maximum air temperature conditions in Orleans and Yreka, CaliforniaTable 6. Average water temperatures for September 1-24, 2002SUMMARYREFERENCES CITEDKlamath River Basin Hydrologic Conditions Prior to the September 2002 Die-Off of Salmon and SteelheadWater-Resources Investigations Report 03–4099U.S. Department of the InteriorU.S. Geological SurveyU.S. Department of the InteriorU.S. Geological SurveyKlamath River Basin Hydrologic Conditions Prior to the September 2002 Die-Off of Salmon and SteelheadBy DENNIS D. LYNCH and JOHN C. RISLEYWater-Resources Investigations Report 03–4099Portland, Oregon: 2003iiU. S. DEPARTMENT OF THE INTERIORGALE A. NORTON, Secretary U.S. GEOLOGICAL SURVEYCHARLES G. GROAT, DirectorThe use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government. ____________________________________________________________________________For additional information: Copies of this report may bepurchased from:District Chief U.S. Geological Survey USGS Information Services10615 S.E. Cherry Blossom Dr. Box 25286, Federal CenterPortland, OR 97216-3159 Denver, CO 80225-0286E-mail: [email protected] Telephone: 1-888-ASK-USGSInternet: http://oregon.usgs.govSuggested citation:Lynch, D.D. and Risley, J.C., 2003, Klamath River Basin hydrologic conditions prior to the September 2002 die-off of salmon and steelhead: U.S. Geological Survey Water-Resources Investigations Report 03–4099, 10 p.iiiCONTENTSAbstract ........................................................................................................................................................................ 1Introduction................................................................................................................................................................. 1Upper Klamath Lake Inflows and Lake Water Levels ................................................................................................. 3Upper Klamath Lake Outflows .................................................................................................................................... 3Diversions from the Trinity River Basin ...................................................................................................................... 5Flows in Middle and Lower Klamath Basin ................................................................................................................ 5Ground-Water Conditions in the Upper Klamath Basin .............................................................................................. 6Water Temperature ....................................................................................................................................................... 8Summary ...................................................................................................................................................................... 9 References Cited ........................................................................................................................................................ 10FIGURES1. Map showing the location of selected streamflow and temperature monitoring sites in the Klamath and Rogue River Basins ....................................................................................................................... 22. Graph showing showing relation between average flows for September 1–24, 2002, and for the 1960 to 2002 September period of record at locations along the Klamath River ............................................................63. Water-level hydrograph from a USGS observation well in the Upper Klamath Lake Basin, Oregon ................ 74. Graph showing August and September 2002 daily water temperatures in the Klamath River at Orleans, California (USGS station number 11523000)..................................................................................................... 9TABLES1. September flow conditions in the Klamath and Trinity River Basins ..................................................................42. Recent and long-term precipitation at Crater Lake, Oregon ................................................................................53. Estimated October mean ground-water discharge above and below the John C. Boyle Reservoir on the Klamath River and from the Spring Creek area near Chiloquin, Oregon, 1999–2002.............................74. Recent and long-term daily maximum water temperature conditions on the Rogue River near Agness, Oregon .................................................................................................................................................................85. Recent and long-term daily maximum air temperature conditions in Orleans and Yreka, California.................86. Average water temperatures for September 1–24, 2002 ......................................................................................9ivCONVERSION FACTORS AND VERTICAL DATUM1Temperature °C = (temperature °F-32)/1.8Vertical coordinates in this report are referenced to the National Geodetic Vertical Datum of 1929 (NGVD of 1929).Multiply By To obtainfoot (ft) 0.3048 meter (m)mile (mi) 1.609 kilometer (km) acre 0.004047 square kilometers (km2)square miles (mi2) 1.590 square kilometers (km2)degrees