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West Slope Water District Tank

West Slope Water District Tank
Portland, Oregon

The 60-year-old “Green Tank” is located on the uphill side of SW Canyon Drive and southeast of SW Canyon Road.  The steel reservoir is about 60 ft high and supported at grade on a bench excavated into the sloping hillside.  GRI completed a seismic evaluation of the reservoir site for use in considering retrofit or replacement of the tank.  Geotechnical services included review of the original plans for the tank, prepared in 1949; subsurface explorations; and development of recommendations for earthwork and design alternatives for retrofit of the existing focusing on the use of supplemental shallow foundations and/or micropiles to resist seismic loading.

Key Staff