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JUNE 23, 1997

Front Page

City expected to study flood control for Trib 87

Trib 87

The rocks and sediment Trib 87 carries downstream into pipes under 140th Avenue NE jam up the system and cause downtown flooding during high flows.
Photo by Andrew Walgamott/Northwest News.

Trib 87 by Andrew Walgamott
The city is expected to take steps soon in studying and eventually controlling flood-prone Trib 87. Forks of the creek flow down the ravine paralleling NE 171st Street and out of the housing developments above Albertson's to empty into the Sammamish River near the Waterford Apartments. Twice last winter, pipes carrying the forks of Trib 87 under 140th Avenue NE became jammed with rocks and debris, flooding the area behind Albertson's and damaging the roadway.
   The city has already spent $160,000 in the past four years on the removal of sediment from the creek, repairing damage to the roadway and on traffic control, according to Surface Water Coordinator Jenny Gaus. "We're really hoping to get sediment control for next year and a long-range plan," Gaus said.
   During council discussion at the June 16 study session, Councilmember Barbara Solberg pointed out that flooding had adversely affected local businesses. "We owe it to them to have the roads passable," she said.
   The city is looking to choose a consultant to prepare a design report with the goal of "immediate" sediment control for the 1998-99 winter. Preliminary suggestions for sediment control include a pond or a high flow bypass that would skim peak flows off of the creek. The study will also develop a long-range plan for Trib 87, including future land uses at the creek's headwaters.
   Trib 87, which may be renamed Woodin Creek for the pioneer family who settled in Woodinville in the 1870s, has been piped in its middle sections since the middle 1980s. The creek supports a resident trout population, according to Gaus. She also said that since King County opened the mouth of the creek on the Sammamish, coho salmon returned to the stream last year.
   The creek drains approximately 650 acres, or an area equivalent to just over one square mile. As Councilmember Art Saulness pointed out, the creek drains not only Woodinville, but unincorporated King County, as well. Gaus said that the county would be asked to be involved in the project.
   Consultant interviews will be held June 25, and council approval has been tentatively set for July 7, according to Gaus. Cost of the study will be approximately $75,000, with funds coming from the Surface Water Reserve Fund.