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South Awbrey Butte Drainage Improvements
PROJECT MESSAGE – SEPT 24, 2025
Geotechnical investigations will be performed in three separate test periods, starting in early October and continuing through mid-November on NW Saginaw Avenue from NW College Way to NW Juniper Street.
These investigations may result in excessive noise near testing areas. Additionally, during testing, no parking will be allowed along the northern frontage of NW Saginaw Avenue.
The associated project area includes the southern hillside of Awbrey Butte as it directs drainage flows to the Newport Avenue Storm Drain System and all surrounding areas which drain towards Newport Avenue.
The Newport Avenue storm drain begins at the intersection of College Way and Newport Avenue, extending east to the outfall at the Deschutes River.
Drainage Study – Completed
The study area included the southern hillside of Awbrey Butte as it directs drainage flows to the Newport Avenue Storm Drain System and all surrounding areas which drain towards Newport Avenue.
The Newport Avenue storm drain begins at the intersection of College Way and Newport Avenue, extending east to the outfall at the Deschutes River.
The selected consultant completed a drainage system analysis to identify drainage problem areas within the catchment area and along the Newport Avenue Storm Drain System. The drainage system analysis included areas which lack or have inadequate drainage facilities to manage a 25-year design storm event, unsafe passage of the 100-year design storm event, and areas of excessive concentrations of debris and other pollutants. The engineering consultant provided preliminary design solutions which meet applicable regulatory requirements. Preliminary design solutions were provided to solicit feedback from internal and external stakeholders.
The project analysis helped to develop a prioritized stormwater project list which provides a systematic and cost-benefit balanced approach to improve deficient segments of the Newport Avenue Storm Drain System and upstream basin drainage problem areas.
