MARCH 10, 1997

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City Council discusses Hollywood Hill stream drainage construction

stream drainage by Andrew Walgamott
At last week's Woodinville City Council meeting, staff recommended signing an interlocal agreement with King County that would begin construction on Tributory 90 stream realignment and the installation of new culverts on lower sections of the creek.
   Trib 90 flows down Hollywood Hill and has impacted the intersection of NE 146th Place and 148th Avenue NE with severe flooding. Plans include smoothing a 90-degree bend in the stream at the Hollywood Hill Schoolhouse, widening the channel, enlarging culverts, and mitigating impact of fish habitat. A second culvert taking the creek under148th would be reworked as well.
   Work has been done in the past two years to stabilize the ravine paralleling lower 146th. Large stumps, root wads, rocks, and logs have been placed in-stream to slow down the flow and control sediment.
   During council discussion, Deputy Mayor Don Brocha noted past cycles of action: "Wait, study, flood. If we wait, we're going to see more floods." Culverts will be sized for 25-year storm flows, but Councilmember Barbara Solberg suggested using culverts capable of handling 50-year floods. Council discussed stream straightening options and Department of Fisheries and tribal regulations affecting work on trout-bearing waters.
   Councilmember Art Saulness sought to find a middle ground between fish habitat and flooding. "Fish-friendly is fine, but I think we've got to solve the flooding problem, because there aren't going to be many fish if it keeps flooding out."
   Emergency permits for work have already been filed with the State Department of Fish and Wildlife and King County Department of Development and Environmental Services, according to a city staff report. If emergency permits are approved, work could begin as early as April. Costs will be divided between King County's Surface Water Management and Road Services and the City of Woodinville.
   The city would be responsible for 50 percent of the total cost of the $332,000 project: $56,000 will be available from the Washington State Department of Transportation's TransAid program for the city's share, with the possibility that the department will fund up to 86.5 percent of the project. It is estimated the project will cost the city $22,000 with and $95,000 without TransAid funding.