Volume II - Assessment i Volume II - Table of Contents 1. INTRODUCTION..................................................................................................... 1 1.A. Program Goal and Objectives....................................................................................................... 2 1.B. Natural Resources Division Activities .......................................................................................... 3 1.C. Background..................................................................................................................................... 4 1.C.1. Douglas County............................................................................................................................... 4 1.C.2. State of Oregon ............................................................................................................................... 7 1.D. Water Quality................................................................................................................................. 8 1.D.1. Total Maximum Daily Load (TMDL) Assessments ....................................................................... 8 2. SUB-BASIN ASSESSMENTS ............................................................................... 10 2.A. Umpqua River / Coastal Lakes Sub-basins................................................................................ 10 2.A.1. Area Description........................................................................................................................... 10 2.A.2. Water Use ..................................................................................................................................... 35 2.A.3. Sub-basin Concerns ...................................................................................................................... 46 2.B. Umpqua River / North Umpqua River Sub-basins ................................................................... 48 2.B.1. Area Description ........................................................................................................................... 48 2.B.2. Water Use...................................................................................................................................... 80 2.B.3. Sub-basin Concerns..................................................................................................................... 102 2.C. Elk Creek / Calapooya Creek Sub-basins ................................................................................ 104 2.C.1. Area Description ......................................................................................................................... 104 2.C.2. Water Use.................................................................................................................................... 130 2.C.3. Sub-basin Concerns..................................................................................................................... 149 2.D. South Umpqua River / Cow Creek Sub-basins........................................................................ 151 2.D.1. Area Description......................................................................................................................... 151 2.D.2. Water Use ................................................................................................................................... 187 2.D.3. Sub-basin Concerns .................................................................................................................... 220 2.E. South Umpqua Tributaries / Loogkingglass Creek Sub-basins ............................................. 223 2.E.1. Area Description ......................................................................................................................... 223 2.E.2. Water Use.................................................................................................................................... 246 2.E.3. Sub-basin Concerns..................................................................................................................... 272 2.F. Camas Valley Sub-basin ............................................................................................................ 275 2.F.1. Area Description.......................................................................................................................... 275 2.F.2. Water Use .................................................................................................................................... 283 2.F.3. Sub-basin Concerns ..................................................................................................................... 289 3. REFERENCES...................................................................................................... 291 APPENDIX F…..Fisheries APPENDIX I.…..Irrigation APPENDIX M… Municipal, Rural Domestic, and Industrial Use Douglas County Water Resources Program 2008 Update Volume II - Assessment ii List of Tables Table 1- 1: Umpqua Basin stream miles (and number of listed segments) on the 303(d) list addressed by the 2006 TMDL..................................................................................................................2 Table 2.A-1: Monthly and annual maximum, mean, and minimum precipitation measured at Gardiner for two time periods...............................................................................................................12 Table 2.A-2: Discharge maximum, minimum, and mean levels, and runoff for the Umpqua River near Elkton and the Smith River near Gardiner.............................................................................13 Table 2.A-3: Mean monthly discharge and the percent of annual discharge from 1906 to 2005 for the Umpqua River near Elkton. ...................................................................................................14 Table 2.A-4: Flood history measured at the Umpqua River near Elkton stream gage. Gage floods at 33 feet. ...................................................................................................................................15 Table 2.A-5: Oregon Water Quality Index rating for the Umpqua River near Elkton for water years 1996-2005..............................................................................................................................16 Table 2.A-6: Percent fecal coliform reduction necessary on each stream to meet the State fecal coliform water quality standard for shellfish.........................................................................18 Table 2.A-7: Stream segments that exceed State water temperature standards (Umpqua River/Coastal Lakes sub-basins). .................................................................................................................20 Table 2.A-8: Streams with potential concern where samples failed to meet State standards but sample sizes were insufficient for listing...........................................................................................25 Table 2.A-9: Waste discharge permits in the Umpqua River/Coastal Lakes sub-basins..............................27 Table 2.A-10: Surface area and volume of larger lakes in the Umpqua River/Coastal Lakes sub-basin. ....29 Table 2.A-11: Number of wells by water yield in different areas of the Umpqua River/Coastal Lakes sub-basins. .............................................................................................................................33 Table 2.A-12: Comparison of well data before and after 1980 for three areas within the sub-basins..........33 Table 2.A-13: Number of wells exceeding water quality standards for public water supplies in the Umpqua River/Coastal Lakes sub-basins in 1984. ................................................................34 Table 2.A-14: Number of samples by range of hardness for each area in the Umpqua River/Coastal Lakes sub-basins....................................................................................................................35 Table 2.A-15: Minimum instream flows to support aquatic life in selected areas of the Umpqua River sub-basin with priority dates of right.....................................................................................39 Table 2.A-16: Public boating sites with launching facilities in the Umpqua River/Coastal Lakes sub- basins. ....................................................................................................................................43 Table 2.A-17: Numbers of fish caught during the 1997-98 season in the Umpqua River sub-basin relative to the entire Umpqua Basin. .....................................................................................43 Table 2.B-1: Monthly and annual precipitation for four locations across the Umpqua River/North Umpqua River sub-basin. ......................................................................................................51 Table 2.B-2: Maximum, minimum, and mean discharge levels, and average annual runoff at four locations in the Umpqua River/North Umpqua River sub-basins..........................................52 Table 2.B-3: Mean monthly discharge and percent of annual discharge from three stations in the Umpqua River/North Umpqua River sub-basins...................................................................52 Table 2.B-4: Water height (in feet) above flood level measured at four stream gages throughout the sub-basins. .............................................................................................................................54