Salado Creek Watershed Data Report October 2016 The preparation of this report was prepared in cooperation with, and financed through, grants from the Texas Commission on Environmental Quality and the U.S. Environmental Protection Agency. Table of Contents Introduction ..................................................................................................................................................... 3 Watershed Location and Physical Description ............................................................................................... 4 Location ...................................................................................................................................................... 4 Land Use ..................................................................................................................................................... 5 Impairments ................................................................................................................................................ 6 TMDL & Watershed Protection .................................................................................................................. 6 Water Quality Parameters ............................................................................................................................... 7 Water Temperature ..................................................................................................................................... 7 Dissolved Oxygen ....................................................................................................................................... 7 Specific Conductivity and Total Dissolved Solids...................................................................................... 7 pH ................................................................................................................................................................ 8 Orthophosphate ........................................................................................................................................... 8 Nitrate-Nitrogen .......................................................................................................................................... 8 Texas Surface Water Quality Standards ..................................................................................................... 9 Data Analysis Methodologies ......................................................................................................................... 9 Data Collection ........................................................................................................................................... 9 Processes to Prevent Contamination ....................................................................................................... 9 Documentation of Field Sampling Activities ........................................................................................ 10 Data Entry and Quality Assurance ............................................................................................................ 10 Data Entry ............................................................................................................................................. 10 Quality Assurance & Quality Control ................................................................................................... 10 Data Analysis Methods ............................................................................................................................. 11 Standards & Exceedances ..................................................................................................................... 11 Methods of Analysis ............................................................................................................................. 11 Salado Creek Watershed Data Analysis ........................................................................................................ 12 Salado Creek Watershed Maps ................................................................................................................. 12 Salado Creek Watershed Trends over Time ................................................................................................. 13 Sampling Trends over Time .................................................................................................................. 13 Trend Analysis over Time ........................................................................................................................ 14 Air and water temperature..................................................................................................................... 14 Total Dissolved Solids .......................................................................................................................... 14 Dissolved Oxygen ................................................................................................................................. 15 1 | P a g e pH .......................................................................................................................................................... 16 Nitrate-Nitrogen .................................................................................................................................... 16 Orthophosphates ................................................................................................................................... 17 Salado Creek Watershed Site by Site Analysis ............................................................................................. 18 Site 13493– Salado Creek at Stagecoach Dam ......................................................................................... 21 Site Description ..................................................................................................................................... 21 Sampling Information ........................................................................................................................... 22 Air and water temperature..................................................................................................................... 22 Total Dissolved Solids .......................................................................................................................... 23 Dissolved Oxygen ................................................................................................................................. 24 pH .......................................................................................................................................................... 25 Nitrate-Nitrogen .................................................................................................................................... 26 Orthophosphates ................................................................................................................................... 27 Field Observations ................................................................................................................................ 28 Site 80894 – Salado Creek at Armstrong Crossing ................................................................................... 28 Site Description ..................................................................................................................................... 28 Sampling Information ........................................................................................................................... 28 Air and water temperature..................................................................................................................... 29 Total Dissolved Solids .......................................................................................................................... 30 Dissolved Oxygen ................................................................................................................................. 30 pH .......................................................................................................................................................... 31 Nitrate-Nitrogen .................................................................................................................................... 32 Orthophosphates ................................................................................................................................... 32 Field Observations ................................................................................................................................ 32 Salado Creek Watershed Summary............................................................................................................... 32 Get Involved with Texas Stream Team! ....................................................................................................... 33 Sources .......................................................................................................................................................... 34 Appendix A- List of Tables and Figures ....................................................................................................... 35 Tables ........................................................................................................................................................ 35 Figures ...................................................................................................................................................... 35 2 |