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Short-Term Flood Reduction Projects
McAleer Creek Bypass Retrofit (Complete)
Aaron Halverson
Environmental Programs Manager

17425 Ballinger Way NE
Lake Forest Park, WA  98155

Phone: 206-368-5440

Monday - Friday
9:00 am - 5:00 pm
This project enhanced the intake of an existing  bypass facility (McAleer Creek Bypass). The intake is located just upstream of the Sheridan Beach neighborhood near the Burke-Gilman Trail crossing. The McAleer Creek Bypass was originally constructed by King County in 1994. In 2009, the City completed a flood reduction modeling project that recommended that the facility's function be improved by enhancing the bypass intake. In 2010, the State awarded the City a grant for $250,000 to design and construct the bypass retrofit project. The project was completed in 2012 and included:
  • A catwalk to provide maintenance access to the intake screens during storm events. This will allow for debris removal and improve the flow of floodwater into the bypass.
  • Adjustable plates on the intake weir that increase pressure on the bypass intake allowing the facility to bypass additional floodwater during storm events.
  • A pipe liner inside the intake facility that is level with the elevation of the bypass pipe. The liner captures the energy of the water falling into the bypass and reduces the occurrence of fish stranding.

Lyon Creek High-Flow Bypass
McAleer Creek Bypass
Similar to the existing McAleer Creek Bypass, a high-flow bypass is proposed on Lyon Creek. This project was also identified in the City's 2009 flood reduction modeling project. The proposed bypass will capture floodwater in Lyon Creek where it crosses NE 178th St., carry the floodwater southeast under Ballinger Way NE in a large pipe and release it into Lyon Creek Waterfront Park. The facility will provide the following flood reduction and stream enhancement benefits:
  • Fine sediment will be captured behind the intake screens while cobble will move downstream, enhancing the most critical section of the stream bed.
  • Reduced erosion caused by floodwater near the Town Center.
  • Installation of large woody debris upstream and downstream of the intake and outlet portions of the facility to create habitat opportunities for aquatic organisms.
  • Flood protection for the Lake Forest Park Town Center, Northshore Fire Department station, State Route 522 (Bothell Way), and over 20 residences in Sheridan Beach.
  • Reduced accumulation of sediment at the mouth of Lyon Creek that impacts the Civic Club and other adjacent neighbors.
The cost estimate of the project is $4.3 million. The City was awarded a $3 million grant from FEMA and $1.05 million from King County Flood Control District to construct the project. The project scheduled for design in 2013 and construction in 2013-15.