FINAL REPORT June 2018
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FINAL REPORT June 2018 MANYMANYY FARMS FA S h s a W e e l l n n i h C CHINLE h h s a W i n i l z a N US 191 CHINLE TO MANY FARMS SAFETY IMPROVEMENT STUDY US 191 Chinle to Many Farms Safety Improvement Study Final Report Prepared for Arizona Department of Transportation & The Navajo Nation Government Prepared by 410 N. 44th Street, Suite 460 Phoenix, Arizona 85008 June 2018 US 191 CHINLE TO MANY FARMS SAFETY IMPROVEMENT STUDY TABLE OF CONTENTS 1.0 Introduction _________________________________________________________________ 1-1 1.1 Study Area 1-1 1.2 Study Purpose 1-4 1.3 Study Process and Previous Studies 1-4 1.4 Public Participation Process 1-7 2.0 Existing and Future Conditions _________________________________________________ 2-1 2.1 Existing Land Use 2-1 2.2 Existing Transportation System 2-3 2.2.1 Roadway Network ______________________________________________________________ 2-4 2.2.2 Key Intersections _______________________________________________________________ 2-8 2.2.3 Traffic Volumes ________________________________________________________________ 2-8 2.2.4 Functional Classification of Roads_________________________________________________ 2-11 2.2.5 Roadway System Operations ____________________________________________________ 2-14 2.2.6 Alternative Transportation Modes _________________________________________________ 2-19 2.3 Current Socioeconomic Characteristics 2-25 2.3.1 Population ___________________________________________________________________ 2-25 2.3.2 Dwelling Units ________________________________________________________________ 2-26 2.3.3 Employment __________________________________________________________________ 2-26 2.3.4 Title VI/Environmental Justice ____________________________________________________ 2-29 3.0 Environmental Overview _______________________________________________________ 3-1 3.1 Physical Conditions Overview 3-1 3.1.1 Topography ___________________________________________________________________ 3-1 3.1.2 Soils _________________________________________________________________________ 3-2 3.2 Natural Resources Overview 3-3 3.2.1 Threatened and Endangered Species of the Eastern Plateau ____________________________ 3-3 3.2.2 Wildlife _______________________________________________________________________ 3-4 3.2.3 Water Resources _______________________________________________________________ 3-7 3.2.4 Air Quality Considerations ________________________________________________________ 3-8 3.3 Cultural Resources Overview 3-9 4.0 Identification of Roadway Network Needs ________________________________________ 4-1 4.1 Information Sources and Previously Identified Issues 4-1 4.1.1 Data Sources __________________________________________________________________ 4-1 4.1.2 Focus Areas ___________________________________________________________________ 4-6 4.2 Crash History and Analysis 4-7 4.2.1 Crash Severity and Trends _______________________________________________________ 4-7 4.2.2 Type and Severity of Corridor Crashes ______________________________________________ 4-9 4.2.3 Light Conditions Associated with All Crashes ________________________________________ 4-10 4.2.4 Intersection-Related Crashes ____________________________________________________ 4-11 4.2.5 Type of Corridor Crashes _______________________________________________________ 4-12 4.2.6 Access Management Issues _____________________________________________________ 4-14 5.0 Safety Strategies and Improvement Options ______________________________________ 5-1 5.1 Improvements to Counteract Historical Crash Trends related 5-1 5.1.1 Add Lighting ___________________________________________________________________ 5-3 5.1.2 Reduce Speed _________________________________________________________________ 5-3 5.1.3 Additional Speed Controls ________________________________________________________ 5-3 5.2 Access Control 5-4 5.3 Roadway Improvements 5-7 FINAL REPORT JUNE 2018 i US 191 CHINLE TO MANY FARMS SAFETY IMPROVEMENT STUDY 5.3.1 Continue Center Left-Turn Lane Outside of City Limits __________________________________ 5-7 5.3.2 Shoulder Widening _____________________________________________________________ 5-8 5.3.3 Slow Vehicle/ Pullouts ___________________________________________________________ 5-8 5.3.4 Potential Drainage Improvements _________________________________________________ 5-10 5.4 Future Improvements 5-10 5.5 Recommendations 5-10 APPENDICES Appendix A – Heritage Data Management System (HDMS) Species List Appendix B – Species of Greatest Conservation Need (SGCN) List Appendix C – Arizona Breeding Bird Atlas List: US-191 Corridor Appendix D – Information Sources and Previously Identified Issues and Proposals for Improvement FINAL REPORT JUNE 2018 ii US 191 CHINLE TO MANY FARMS SAFETY IMPROVEMENT STUDY LIST OF FIGURES Figure 1.1 Study Area ................................................................................................................................ 1-2 Figure 1.2 Regional Setting ....................................................................................................................... 1-3 Figure 1.3 Issues/Opportunities Display Board: May Public Meeting ......................................................... 1-8 Figure 1.4 Focus Areas of Preliminary Recommendations ........................................................................ 1-9 Figure 2.1 Current Land Use Pattern ......................................................................................................... 2-2 Figure 2.2 Intersection Turning-Movement Traffic Counts ......................................................................... 2-9 Figure 2.3 Segment Traffic Volumes ....................................................................................................... 2-10 Figure 2.4 Functional Classification of US-191: MP 440 to MP 470 ........................................................ 2-13 Figure 2.5 Average Daily Truck Traffic by Segment ................................................................................ 2-15 Figure 2.6 Illustrative Intersection Functional Areas: US-191/N7 Intersection ......................................... 2-18 Figure 2.7 Pinon Junction Transit Stop .................................................................................................... 2-21 Figure 2.8 Chinle – Transit Sub-Station ................................................................................................... 2-21 Figure 2.9 School Bus Routes Serving the Study Area ........................................................................... 2-22 Figure 2.10 Designated School Bus Stop Locations ................................................................................ 2-23 Figure 2.11 Signalized Pedestrian Crossing at US-191/N7 Intersection .................................................. 2-24 Figure 2.12 Faded Crosswalk Westbound Approach ............................................................................... 2-24 Figure 2.13 Census Tracts, Block Groups, and CDPs for Chinle and Many Farms Chapters ................. 2-27 Figure 3.1 General Topographic Features of the Study Area .................................................................... 3-1 Figure 3.2 Chinle Wash Watershed ........................................................................................................... 3-7 Figure 4.1 Previously Identified Issues/Opportunities: Roadway Characteristics ....................................... 4-2 Figure 4.2 Previously Identified Issues/Opportunities: Pedestrian/Bike/Transit Safety and Lighting .......... 4-2 Figure 4.3 Previously Identified Issues/Opportunities: Drainage and Flooding .......................................... 4-3 Figure 4.4 Previously Identified Issues/Opportunities: Development Impacts............................................ 4-4 Figure 4.5 Crash Focus Areas ................................................................................................................... 4-7 Figure 4.6 US-191 Crash Locations, Severity, and Lighting Conditions: 2011 – 2015 ............................... 4-9 Figure 4.7 US-191 Crash Severity and Trends: 2011 – 2015 .................................................................. 4-10 Figure 4.8 Crash Light Conditions, 2011-15 ............................................................................................ 4-11 Figure 4.9 Locational Attributes of Crashes ............................................................................................. 4-11 Figure 4.10 Crash Types, 2011-15 .......................................................................................................... 4-12 Figure 4.11 Analyses of Three Crash Types ............................................................................................ 4-13 Figure 5.1 Safety Improvement Recommendations ................................................................................... 5-2 Figure 5.2 Option A: Install Raised Median, Relocate and Consolidate Driveways ................................... 5-5 Figure 5.3 Option B: Install Raised Median ............................................................................................... 5-6 Figure 5.4 Existing and Proposed Bus Stops and Bus Pullouts ................................................................. 5-9 FINAL REPORT JUNE 2018 iii US 191 CHINLE TO MANY FARMS SAFETY IMPROVEMENT STUDY LIST OF TABLES Table 2-1 Critical Information for Bridges within the US-191 Study Area ................................................... 2-6 Table