Downtown Washington Street Bridge Replacement Public Meeting 1 - PowerPoint PPT Presentation

Downtown Washington Street Bridge Replacement Public Meeting 1 – February 9, 2017

Downtown Washington Street Bridge Replacement 1 Purpose of Project Existing Structure History • Originally Built in 1928 • Superstructure Replacement in 1977 • Deck overlay in 2004 • Average daily traffic = 29,800 vehicles The Need for a New Bridge Downtown Advisory Commission – January 2017 • An inspection of the existing bridge indicated that due to the age and condition of the bridge, substantial repairs would be required. • A feasibility study was conducted in 2014 to review repair options and recommended a full structural replacement. • The bridge has been load restricted to 15 tons to extend the life of the structure before it is replaced. • Quarterly inspections are being conducted to ensure the safety of the existing structure Other Benefits of New Structure The replacement of an existing structure allows for several other factors along Washington Street to be improved including the existing roadway facility, the Riverwalk and structure aesthetics.

Downtown Washington Street 2 Bridge Replacement Existing Land Use JIMMY’S BAR NORTH FREDENHAGEN PARK BENJAMIN MOORE AT&T BURGER KING

Downtown Washington Street 3 Bridge Replacement 5 ‐ Year Crash History/Trends Chicago/Washington Intersection Crashes (123 Crashes) 1% 2% 5% NORTH 7% 7% 7% 55% 16% Insufficient left turn lane length and taper as indicated by Angle Rear End high occurrence of rear end crashes. Fixed Object Sideswipe Pedestrian Turning Cyclist Parked Motor Vehicle Aurora/Washington Intersection Crashes (114 Crashes) 1% 2% 7% Insufficient left turn lane length and 10% taper as indicated by high occurrence of rear end crashes. 54% 26% Narrow receiving lanes from eastbound Aurora Ave left turn Parked Motor Vehicle Rear End as indicated by high Angle Sideswipe occurrence of side ‐ swipe crashes Fixed Object Turning Crash history reviewed from July 2011 through * August 2016

Downtown Washington Street 4 Bridge Replacement Traffic/Trends NORTH Through traffic backups blocking turn lanes. 5 th lane would improve operations. High Turning movements likely necessitates additional turning lanes.

Downtown Washington Street 5a Bridge Replacement Potential Traffic Improvements NORTH CHICAGO AVE Turn lane tapers Extended turn lane extended to meet will improve current regulatory intersection standards operations and reduce crashes Extended turn lane will improve intersection operations and reduce crashes Additional right turn lanes will reduce congestion at intersection Widened receiving lanes will reduce side ‐ swipe crashes on eastbound to AURORA AVE northbound left turn Existing Right ‐ of ‐ Way Existing Right ‐ of ‐ Way approximate

Downtown Washington Street 5b Bridge Replacement Existing Traffic Conditions NORTH CHICAGO AVE AURORA AVE Existing Right ‐ of ‐ Way

Downtown Washington Street Bridge Replacement 6 Bridge and Riverwalk Considerations The existing bridge has 2 piers. One or both of The existing roadway on both sides of the bridge could be the piers could be removed. This would improve raised, allowing the bridge and Riverwalk to be raised. The the view of the river from the Riverwalk, but the driveways to the north and south of the bridge constrain how fewer piers requires a deeper bridge. much the proposed roadway can be raised. Depth of Bridge Elevation above sea level (feet) 670.0 (50 ‐ Year Floodplain ) Downtown Advisory Commission – January 2017 663.5 (Upstream Riverwalk Elevation) 662.0 (Existing Riverwalk at Bridge) The existing vertical clearance is slightly greater than West Branch of the DuPage River 8 feet. The proposed clearance could be reduced to raise the Riverwalk and reduce flooding. (Looking Downstream from Main Street) 5.5 feet Naperville Riverwalk Several bridge types will be considered to maximize head room on the Riverwalk while maintaining the look and feel of Downtown Naperville.

Downtown Washington Street 7 Bridge Replacement Bridge and Riverwalk Aesthetics

Downtown Washington Street Bridge Replacement 8 Potential Aesthetics ‐ Overview SECTION A ‐ A Downtown Advisory Commission – January 2017 FUTURE WASHINGTON PARK DEVELOPMENT (430 South Washington) • Independent project of the Washington Street Bridge replacement • Continues to be part of the City’s long range plan pending funding availability • The Washington Street bridge replacement will be coordinated with the 430 S. Washington Development.

Downtown Washington Street Bridge Replacement 9 Sidewalk Considerations There are several options for sidewalk across the bridge. At least one solid barrier is required across the structure. Additional barriers and the width of the walkway will be determined during the design phase. Existing Width = 7.5 feet Minimum Required Width = 5 feet • No barrier between traffic and pedestrians. • Matches existing conditions Downtown Advisory Commission – January 2017 • Non ‐ solid barrier (fence) between traffic and pedestrians • Solid barrier between traffic and pedestrians • Similar to Eagle/Main Street • May require guardrail at terminal ends * Additional aesthetic options can be viewed on board 10.

Downtown Washington Street 10 Bridge Replacement Sidewalk Aesthetics

Downtown Washington Street Bridge Replacement 11 Construction Concepts Option 1 – Partial Closure with one Option 2 – Full Closure with Detour lane in each direction maintained • Reduced construction time allows for less • Maintains vehicular traffic across bridge cost of construction • Allows for pedestrian traffic across bridge • Estimated Construction Duration: Single • Estimated Construction Duration: Multiple Construction Season Construction Seasons Existing Structure Downtown Advisory Commission – January 2017 Construction Final Bridge (Final Bridge Section to be determined)

Downtown Washington Street Bridge Replacement 12 Project Schedule we are here 2019 2017 2018 Identify Construction Plan Develop Construction Transportation Preparation Preliminary Plan Issues Phase 1 Phase 3 Phase 2 Downtown Advisory Commission – January 2017 The second public meeting will be held late spring/early summer of 2017. Using input from this meeting and additional engineering analysis, a preferred alternative will be * presented. There will be an opportunity for additional comments on the preferred alternative at the second public meeting. Your Input Matters! The City of Naperville is now seeking public input on the proposed designs for the Downtown Washington Street Bridge Replacement Project as well as on the project timeline and other information presented during this public open house. All residents, business people, visitors and more are invited to share their perspectives on the information presented. All the information presented is now available on the project webpage at www.naperville.il.us/dtwashingtonbridge. Public input is being accepted through Wednesday,March 1. For more information, please contact: Yifang Lu, P.E. City of Naperville (630) 420-4192 luy@naperville.il.us