Final Technical Report Addendum Salem River Crossing Project Traffic and Transportation Technical Report Addendum Prepared for Oregon Department of Transportation October 2016 Prepared by Contents Section Page Acronyms and Abbreviations ....................................................................................................... vii 1 Introduction ......................................................................................................................... 1-1 1.1 Summary of Project Purpose and Need .............................................................. 1-1 1.2 Description of the Preferred Alternative ............................................................. 1-2 1.2.1 National Environmental Policy Act (NEPA) ......................................... 1-2 1.2.2 Crossing Location and Bridge Description ............................................ 1-2 1.2.3 Eastside Bridgehead and Distribution Network ................................... 1-2 1.2.4 Westside Bridgehead and Distribution Network ................................. 1-7 1.2.5 Bridge Type .............................................................................................. 1-13 1.2.6 Construction Activities ........................................................................... 1-15 1.2.6.1 Construction Impacts on East Side of Willamette River ....... 1-15 1.2.6.2 Construction Impacts on West Side of Willamette River ..... 1-15 1.2.6.3 Construction Mitigation Measures .......................................... 1-15 1.2.7 River Traffic .............................................................................................. 1-16 2 Affected Environment ....................................................................................................... 2-1 2.1 Regulations and Standards ................................................................................... 2-1 2.1.1 Federal Highway Administration (FHWA) Regulations ..................... 2-1 2.1.2 Oregon “Bike Bill” ..................................................................................... 2-1 2.1.3 Americans with Disabilities Act (ADA) ................................................. 2-1 2.1.4 Oregon Highway Plan .............................................................................. 2-1 2.1.5 City of Salem Transportation System Plan ............................................ 2-2 2.2 Study Area ............................................................................................................... 2-3 2.3 Roadway System Operations ................................................................................ 2-3 2.3.1 Regional Measures Analysis .................................................................... 2-3 2.3.2 Peak Hour Spreading ................................................................................ 2-7 2.3.3 Intersection-Level Analysis ...................................................................... 2-7 2.3.4 Bridge and Roadway Volumes .............................................................. 2-12 2.3.4.1 Center Street Bridge ................................................................... 2-12 2.3.4.2 Marion Street Bridge .................................................................. 2-15 2.3.4.3 North Salem Area ....................................................................... 2-15 2.3.4.4 West Salem Area ......................................................................... 2-16 2.4 Safety Conditions Analysis ................................................................................. 2-16 2.4.1 Corridor Crash Rates .............................................................................. 2-16 2.4.2 Safety Priority Index System .................................................................. 2-17 2.5 Transit Service ....................................................................................................... 2-18 2.6 Pedestrian and Bicycle System ........................................................................... 2-18 SALEM RIVER CROSSING PROJECT FEIS PAGE III TRAFFIC AND TRANSPORTATION FINAL TECHNICAL REPORT ADDENDUM CONTENTS, CONTINUED SECTION PAGE 3 Data Sources and Data Collection Methods ................................................................. 3-1 3.1 Data Collection and Analysis Methods .............................................................. 3-1 4 Impacts Analysis ................................................................................................................ 4-1 4.1 Overview of Impact Analysis ............................................................................... 4-1 4.1.1 Past and Present Actions .......................................................................... 4-1 4.1.2 Reasonably Foreseeable Future Actions ................................................ 4-4 4.2 Direct Impacts ......................................................................................................... 4-4 4.2.1 No Build Alternative ................................................................................ 4-4 4.2.1.1 Roadway System Operations: Intersection-Level Analysis ... 4-5 4.2.1.2 Bridge and Roadway Volumes ................................................ 4-10 4.2.1.3 Transit Service ............................................................................ 4-14 4.2.1.4 Pedestrian and Bicycle System ................................................. 4-14 4.2.2 Preferred Alternative .............................................................................. 4-15 4.2.2.1 Roadway System Operations: Intersection-Level Analysis . 4-15 4.2.2.2 Bridge and Roadway Volumes ................................................ 4-22 4.2.2.3 Transit Service ............................................................................ 4-26 4.2.2.4 Pedestrian and Bicycle System ................................................. 4-27 4.3 Construction Impacts .......................................................................................... 4-27 4.3.1 Impacts on East Side of Willamette River ........................................... 4-27 4.3.2 Impacts on West Side of Willamette River .......................................... 4-27 4.4 Indirect Impacts.................................................................................................... 4-28 4.4.1 No Build Alternative .............................................................................. 4-28 4.4.1.1 No Build Alternative Roadway System Operations: Regional Measures Analysis ..................................................................... 4-28 4.4.2 Preferred Alternative .............................................................................. 4-28 4.4.2.1 Roadway System Operations: Regional Measures Analysis 4-30 4.5 Cumulative Impacts ............................................................................................ 4-31 4.5.1 No Build Alternative .............................................................................. 4-31 4.5.2 Preferred Alternative .............................................................................. 4-32 4.6 Mitigation Measures ............................................................................................ 4-33 5 Conclusions ......................................................................................................................... 5-1 5.1 Summary of Impacts .............................................................................................. 5-1 5.1.1 Direct Impacts ........................................................................................... 5-1 5.1.1.1 River Crossing Volumes ............................................................. 5-1 5.1.1.2 Intersection Operation Analysis ................................................ 5-1 5.1.2 Indirect Impacts ........................................................................................ 5-5 5.1.3 Construction Impacts ............................................................................... 5-5 5.2 Permits Likely Needed .......................................................................................... 5-6 6 Contacts and Coordination .............................................................................................. 6-1 7 References ........................................................................................................................... 7-1 TRAFFIC AND TRANSPORTATION FINAL PAGE IV SALEM RIVER CROSSING PROJECT FEIS TECHNICAL REPORT ADDENDUM CONTENTS, CONTINUED SECTION PAGE Appendix A Final Environmental Impact Statement (FEIS) Traffic Analysis Results Tables 2.1-1 Mobility Targets and Standards Applicable to Operational Analysis of Existing Conditions ........................................................................................................ 2-2 2.2-1 Study Area Intersections ............................................................................................... 2-5 2.3-1 Regional Measures: Existing Conditions 2014 ........................................................... 2-7 2.3-2 2012 Existing Conditions Intersection Analysis for AM and PM Peak and Control Type ................................................................................................................. 2-10 2.3-3 Westbound Marion Street Queues at High Street ................................................... 2-15 2.4-1 Historical Segment Crash Data Summary in the Study Area (2010-2014) ........... 2-17 2.4-2 Locations of the Top 10 Percent