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Saskatchewan Crescent - 16th Street Slope Remediation

Slope instability has been a re-occurring issue along the east bank of the South Saskatchewan River for many years. In 2014, the lower Meewasin Trail and sidewalk near Saskatchewan Crescent and 16th Street began to show signs of movement. In the spring of 2016, the movement increased significantly and the City closed the affected section of the Meewasin trail, sidewalk and street for public safety.

Construction to remediate the slope, Saskatchewan Crescent and the upper and lower Meewasin Trails began in August 2016. The majority of the work was completed by mid-November 2016.  Construction was completed in August 2017 with additional work on the 16th Street Outfall along the lower slope being completed in November 2017. Construction included:

  • Installing steel H-piles to a an approximate depth of 18 m, a concrete lagging retaining wall, and sub-drainage system
  • Repaving Saskatchewan Crescent and the Upper Meewasin Trail above the retaining wall
  • Rehabilitating the lower slope
  • Construction of a riprap channel below the 16th Street Outfall
  • Restoring and reopening of the Lower Meewasin Trail

 

Additional Retaining Wall Information

The retaining wall consists of 36 H-piles (depth of 18 metres) spanning 70 metres along Saskatchewan Crescent. The concrete wall is 44 metres with a maximum height of 3.2 metres. 

What causes riverbank slope instability?
Three main factors contribute to riverbank slope movement: groundwater (high water table), geometry (steep slope) and geology (weaker soils on top of stronger soils can slip).  In the decade leading up to the slope failure, Saskatoon experienced record high rainfall, leading to high groundwater levels.
River

A time lapse video of the retaining wall construction can be found by clicking here: Sask Cr & 16th Street Riverbank Remediation Time Lapse 

For more information, contact our storm water management staff at stormwater@saskatoon.ca or 306-975-7698 during regular business hours.