What is this Project?
This project increases system capacity to deliver high-quality drinking water from the Clackamas River to the communities of Lake Oswego and Tigard. Together these two communities can secure long-term access to clean, safe water for less than it would cost them to do it alone. Learn more...
Crews focus on stabilizing and securing the cofferdam sheet piles
Crews at the river intake pump station site in Gladstone have been working to stabilize and secure the cofferdam sheet piles that detached and tilted into the river late last month.
Yesterday, additional steel beams were installed inside the cofferdam using a ”vibratory hammer,” which is the same method that was first used to install the sheet piles. Once the beams are in place, they will be welded to the existing horizontal support brace in the cofferdam. This work will continue through this week.
Neighbors may notice an increase in noise and potential vibration as crews work to repair the cofferdam and install the beams. Work hours will be 7 a.m. to 6 p.m. Monday to Friday.
Despite the breach, work will be able to continue within the portion of the pump station that has already been constructed. Crews are continuing to prepare for the next stage of forming the pump station floor decking.
We apologize for the inconvenience this work may cause, and thank you for your patience.
For more information, please contact the Project Hotline at 503-697-6502, email firstname.lastname@example.org.
Placing electrical conduit in the ballasted flocculation, prior to pouring concrete base slabs
This week at the WTP, crews have been busy forming walls and pouring concrete for base slabs in the clearwell, placing electrical and control conduit in the ballasted flocculation base and excavating next to the west of the lagoon area.
Next week, auger cast pile drilling will resume for new foundations including the gravity thickener and solids storage tank structures, along with the foundation for the second tower crane.
In late March, the second tower crane will be installed, located on the west of the site. Pre-work will be occurring over the next few weeks to prepare for crane assembly and the foundation.
Although there are no anticipated “new” activities or new sources of noise or vibration, neighbors can expect some noise and potential vibration during the auger cast drilling, concrete work and excavation, depending on locations or personal sensitivities. Also, there will be an increase in truck traffic with concrete trucks and dump trucks hauling spoils off site during the concrete pouring.
After daylight savings begins, work hours will be increasing Monday to Friday from 7:00 a.m. to 7:00 p.m. and Saturdays, from 9:00 a.m. to 5:00 p.m., which are allowed within the conditions of approval for the project.
For more detail about what activities are happening on site please read more to see the table below.
36" welded steel pipe construction underway on Lanewood Street
This update includes information about construction work in the following areas of
Lake Oswego. Please read more for specific information on each location:
- East Waluga Park parking lot
- Lanewood Street
- Douglas Circle
- Upper Drive
- Iron Mountain Boulevard
- Chandler Road
- Lake Oswego Hunt Club
Some river intake cofferdam sheet piles tilted Wednesday, causing water to enter the work area.
Heavy rains over the weekend may have contributed to a breach on the bank side of the cofferdam, causing it to fill with water. Crews worked to reinstall sheet piles to repair the breach earlier this week.
A second failure on the river side of the cofferdam occurred late yesterday, resulting in several sheet piles detaching and tilting into the river. Safety crews were on-site last night monitoring the situation. Damage assessments are currently underway and the focus is on securing the cofferdam against any further failure. No injuries were reported during this event.
The Partnership and its contractor’s first priority is safety. Crews will be working to stabilize and secure the sheet piles. Despite the breach, work will be able to continue within portion of the pump station that has already been constructed.
Neighbors may notice an increase in noise and potential vibration as crews work to repair the cofferdam. Updates will be provided once the approach to repairs is determined.
For more information, please contact the Project Hotline at 503-697-6502 or email email@example.com.
A cofferdam for a new Lake Oswego water intake pumping station currently under construction on the Clackamas River collapsed Wednesday afternoon in Gladstone.
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