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Jul 30

Minor Delays Expected for 48 Avenue Bridge Replacement Project

Posted on July 30, 2018 at 8:30 AM by Ashton Ford

Unfortunately, it looks as though the completion date for the 48 Avenue Bridge Replacement project will be delayed until early to mid-October.

During an on-site meeting in late June 2018, the City highlighted a possible issue with the original design. Upon investigation in July, the project team determined that there was in fact a communication error related to the design of the lane widths for 48 Avenue. Unfortunately, this issue was not identified and fixed before the design was finalized in 2017. When originally designed by AMEC, each lane was set at 3.7 metres; this included the driving lane, as well as a 0.3 metre wide roadway gutter for the curb lanes. AMEC designed the project this way, as this standard is used in some other municipalities. The standard that the City of Camrose has typically uses for all sections along 48 Avenue is to have 3.7 metre lane widths, with an additional 0.5 metres for each roadway gutter. The City uses this standard on all truck routes within Camrose and particularly along 48 Avenue, which is the City’s designated route for over-width vehicles. This standard gives users some extra room to account for the fact that drivers do not tend to drive within the gutter, or near the curb. Without this extra room for the gutters included, the constructed roadway under the original design would be approximately 2 metres narrower than desired (0.5 metres per location along the inside and outside edges for both the eastbound and westbound lanes).

Over the past month, the project team has been working together to determine various options to find a solution to this issue. Some of the considered solutions were to keep a narrower roadway through the project, to widen the bridge structure, and to reduce the widths and/or eliminate the pedestrian walkways that will run along either side of 48 Avenue. Ultimately, the City decided to reduce the width of the south pedestrian trail from 4 metres to 2 metres. This will allow for the proper roadway lane widths, and still allow for a reasonable pedestrian pathway. Previously, the sidewalks along 48 Avenue were 1.8 metres wide; therefore the addition of a 2 metre pathway on the south side will still easily accommodate the local foot traffic. Additionally, the project still maintains a 4 metre wide pathway across the bridge on the north side of 48 Avenue.

In order to complete this change, PSA will need to remove and reinstall two of the recently installed girders, in order to narrow the southern walkway. Similarly some miscellaneous infrastructure, like the new signal poles at 53 Street will need to be relocated. See below for a visual representation of the changes being made to the girders.

This change is estimated to delay the project an additional three to four weeks, putting the predicted completion date in early to mid-October. There should be no impact to the overall project budget, as the City included a “project contingency” to account for potential changes like this when City Council originally approved the budget. More information will become available as the City continues to conference with PSA and AMEC, and further updates will be made as the information is shared.

The City of Camrose would like to continue to thank everyone for their patience and understanding. If anyone has questions, regarding the project as a whole, or this design change specifically, please contact the City of Camrose Engineering department at engineer@camrose.ca or at 780.672.4428.

original_design_image
The original design. The exterior lanes in both the eastbound and westbound roadways transition from roadway, immediately to the curb.

new_plan_image
New plan for the bridge design. The girder that contains the south roadway railing will be rotated 180 degrees (east for west), and switched with the flat girder directly south of it. This will narrow the south walkway, in order to create the needed width to maintain desired safety standards for the roadway.