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

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Aug 28, 2023 260 likes •415 views

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

SLIDE 1

Downtown Washington Street Bridge Replacement

Public Meeting 1 – February 9, 2017

SLIDE 2

Downtown Advisory Commission – January 2017

Downtown Washington Street Bridge Replacement

Purpose of Project Existing Structure History

Originally Built in 1928
Superstructure Replacement in 1977
Deck overlay in 2004
Average daily traffic = 29,800 vehicles
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
ptions 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

The Need for a New Bridge

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.

Other Benefits of New Structure

1

SLIDE 3

Downtown Washington Street Bridge Replacement

FREDENHAGEN PARK BENJAMIN MOORE AT&T BURGER KING JIMMY’S BAR

Existing Land Use

NORTH

2

SLIDE 4

Downtown Washington Street Bridge Replacement

5‐Year Crash History/Trends

NORTH Chicago/Washington Intersection Crashes (123 Crashes)

Rear End Sideswipe Turning Parked Motor Vehicle Angle Fixed Object Pedestrian Cyclist Rear End Sideswipe Turning Parked Motor Vehicle Angle Fixed Object

54% 26% 10% 7% 2% 1% 55% 16% 7% 7% 7% 5% 2% 1%

Insufficient left turn lane length and taper as indicated by high occurrence of rear end crashes. Insufficient left turn lane length and taper as indicated by high occurrence of rear end crashes. Narrow receiving lanes from eastbound Aurora Ave left turn as indicated by high

ccurrence of side‐

swipe crashes

Crash history reviewed from July 2011 through August 2016 *

Aurora/Washington Intersection Crashes (114 Crashes)

3

SLIDE 5

Downtown Washington Street Bridge Replacement

Traffic/Trends

NORTH

High Turning movements likely necessitates additional turning lanes. Through traffic backups blocking turn

lanes. 5th lane would

improve operations.

4

SLIDE 6

Downtown Washington Street Bridge Replacement

Potential Traffic Improvements

NORTH

Existing Right‐of‐Way approximate Extended turn lane will improve intersection

perations and

reduce crashes Turn lane tapers extended to meet current regulatory standards Extended turn lane will improve intersection

perations and

reduce crashes Additional right turn lanes will reduce congestion at intersection Widened receiving lanes will reduce side‐swipe crashes

n eastbound to

northbound left turn Existing Right‐of‐Way

CHICAGO AVE AURORA AVE

5a

SLIDE 7

Downtown Washington Street Bridge Replacement

Existing Traffic Conditions

5b

NORTH

Existing Right‐of‐Way

CHICAGO AVE AURORA AVE

SLIDE 8

Downtown Advisory Commission – January 2017

Downtown Washington Street Bridge Replacement

Bridge and Riverwalk Considerations

6

670.0 (50‐Year Floodplain) 662.0 (Existing Riverwalk at Bridge)

Elevation above sea level (feet)

Depth of Bridge

West Branch of the DuPage River

(Looking Downstream from Main Street) The existing vertical clearance is slightly greater than 8 feet. The proposed clearance could be reduced to raise the Riverwalk and reduce flooding. The existing roadway on both sides of the bridge could be raised, allowing the bridge and Riverwalk to be raised. The driveways to the north and south of the bridge constrain how much the proposed roadway can be raised. The existing bridge has 2 piers. One or both of the piers could be removed. This would improve the view of the river from the Riverwalk, but the fewer piers requires a deeper bridge. 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.

663.5 (Upstream Riverwalk Elevation)

SLIDE 9

Downtown Washington Street Bridge Replacement

Bridge and Riverwalk Aesthetics

7

SLIDE 10

Downtown Advisory Commission – January 2017

Downtown Washington Street Bridge Replacement

Potential Aesthetics ‐ Overview

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SECTION A‐A 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.

SLIDE 11

Downtown Advisory Commission – January 2017

Downtown Washington Street Bridge Replacement

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.
No barrier between traffic and pedestrians.
Matches existing conditions
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

Sidewalk Considerations

9

Existing Width = 7.5 feet Minimum Required Width = 5 feet * Additional aesthetic options can be viewed on board 10.

SLIDE 12

Downtown Washington Street Bridge Replacement

Sidewalk Aesthetics

10

SLIDE 13

Downtown Advisory Commission – January 2017

Downtown Washington Street Bridge Replacement

Construction Concepts

Option 2 – Full Closure with Detour Option 1 – Partial Closure with one lane in each direction maintained

Maintains vehicular traffic across bridge
Allows for pedestrian traffic across bridge
Estimated Construction Duration: Multiple

Construction Seasons

Reduced construction time allows for less

cost of construction

Estimated Construction Duration: Single

Construction Season

Existing Structure Construction Final Bridge

(Final Bridge Section to be determined)

11

SLIDE 14

Downtown Advisory Commission – January 2017

Downtown Washington Street Bridge Replacement

Project Schedule

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.

* Identify Transportation Issues

Develop Preliminary Plan Construction Plan Preparation

Construction 2017 2018 2019

we are here Phase 1 Phase 2 Phase 3

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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

n 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