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The City of Portland, Oregon

Portland Water Bureau

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Washington Park Reservoir Improvements Project: July 2016 Update

The Portland Water Bureau and contractor Hoffman Construction Company have officially begun a long-term capital improvement project to update the Washington Park reservoir site at 2403 SW Jefferson Street. The project complies with federal and state mandates, seismically strengthens key water infrastructure on Portland’s west side, and helps ensure a healthy, resilient, and secure water system.

A new 12.4 million gallon, seismically reinforced below ground reservoir will be constructed with a reflecting pool/water feature on top. The new reservoir will preserve the historic drinking water function provided by the original reservoirs and be engineered to withstand ongoing landslide encroachment and potentially catastrophic effects of a major earthquake. Existing Reservoir 4 will be disconnected from the public drinking water system and a lowland wildlife habitat area, bioswale, and reflecting pool will be constructed in the basin.

When complete and online, the new reservoir will supply water to Portland’s west side and serve more than 360,000 people. This will include all downtown businesses and residents, 20 schools, three hospital complexes, more than 60 parks, and the Oregon Zoo.

Construction will proceed through 2019. A pause will occur from 2020 to 2022 to allow soils to consolidate to reduce any vertical movement. From 2022 to 2024, construction of interpretive features, including the two reflecting pools and surface features, will conclude the project.

July - Mid-September 2016 
From now until mid-September 2016, the following construction activity is scheduled to occur.

This activity will cause impacts to traffic, parking, and TriMet bus service.

See chart below and access an online map detailing traffic impacts and entrances into and exits out of Washington Park during this period.

  • Tree and vegetation inspection, pruning, and clearing on SW Sacajawea and Sherwood boulevards
  • Construction fence installation
  • Placement of mobile field offices
  • Erosion control
  • Disconnection of existing Reservoir 3 and 4 inlet and outlet piping
  • Removal of Weir Building
  • Cut and cap of old piping
  • Removal of stilling tank inside Gatehouse 4
  • **Traffic Delays: Travelers may experience intermittent traffic flow delays up to 20 minutes on SW Sacajawea and Sherwood boulevards. Short-term closures may also occur with detours put in place.
  • **Parking: All parking will remain open on SW Lewis Clark Way and SW Sacajawea and Sherwood boulevards except during short-term closures.
  • TriMet Bus Service: TriMet Bus Line 63 – Washington Park to Oregon Zoo may have minor delays. Stop ID 6177 - SW Sacajawea and Sherwood may be intermittently affected depending on construction activity. Check for real time updates.
**Construction-related traffic impacts are subject to change. To avoid traffic delays through the area, plan ahead and consider alternate routes to get to your destination.
  • W Burnside Road to SW Tichner Drive
  • W Burnside Road to SW Fischer Lane
  • SW Fairview Boulevard to SW Knights Boulevard
  • SW Park Place to SW Lewis Clark Way
  • SW Knights Boulevard to SW Canyon Road
  •   SW Tichner Drive to W Burnside Road
  •   SW Knights Boulevard to SW Fairview Boulevard
  •   SW Fischer Lane to W Burnside Road
  •   SW Sacajawea Boulevard to SW Park Place
  •   SW Canyon Road to SW Knights Boulevard
From now until mid-September 2016, all park entrances and exits will remain open.


Cut and Cap Piping  Within project site X        
Tree Pruning / Inspection  Within project site X X       
Fence Installation
 Within project site   X       
Vegetation/ Tree Removal  Around
the reservoirs, by SW Sacajawea and Sherwood boulevards
Erosion Control  Within project site   X       
Disconnect Reservoir 3 Inlet and Outlet Piping  Within project site   X       
Remove Weir Building  Within project site    X X    
Reservoir 4 Inlet and Outlet Piping
 Within project site    X X     
Removal of Stilling Tank inside Gatehouse 4  Within project site    X  X    
Selective Site Demolition  Within project site    X  X    
Construct Upper and Lower Shoring Walls  Within project site     X   X  X

The Water Bureau will be presenting project updates at upcoming local neighborhood association meetings. Join us to learn more about the project. 

To contact us with questions or concerns or to sign up to receive project updates by e-mail:


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