Project goals

To reduce flooding over roadway in the vicinity of Northeast 8th Street from 245th Place Northeast to 250th Avenue Northeast by developing alternative solutions and implementing cost effective measures.

Summary milestone schedules

• Completed Feasibility Study January 2013
• Completed Planning Phase February 2013

King County actions

• We hand removed non-native vegetation and obstructions in the Allen Lake Outlet Channel from NE 8th Street to approximately 1,050 feet downstream in August 2012.
• We replaced a failed driveway culvert, located approximately 1,450 feet downstream of Northeast 8th Street in March 2012.
• We cleared 4 driveway culverts from Northeast 8th Street to approximately 1,800 feet downstream in December 2011.
• We installed a beaver exclusion fence (317 KB) at the inlet of pipe system at Northeast 8th Street near 250th Avenue Northeast during June 2011.
• King County Department of Transportation has replaced the damaged trash rack on Northeast 8th Street in July 2011.
• King County Department of Transportation cleaned out the pipe system on Northeast 8th Street in June 2011 and June 2014.
• In 2015, we removed non-native vegetation and planted native plants along the channel from Northeast 8th Street to approximately 1500 feet downstream.

Deliverables

We hosted a public meeting on October 29, 2014 and materials from the meeting are available:

• Presentation (1.8 MB)
• Allen Lake project map/aerial photo (1.1 MB)
• Public meeting summary (358 KB)

We hosted a public meeting on October 29, 2011 and notes from the meeting are available:

• Public meeting notes (214 KB)
• Public comments (57 KB)

Notes from the Feb. 12, 2011 public meeting:

• Public meeting notes (220 KB)
• Public meeting facilitator's comments (134 KB)

We prepared the Allen Lake Outlet Rapid Assessment:

• View the Allen Lake Outlet Rapid Assessment (7.8 MB)

We prepared the Allen Lake Outlet Feasibility Study:

• View the Feasibility Study (5.6 MB)
• View the 2017 Update to the Feasibility Study (9.9 MB)

We prepared the Allen Lake Outlet Stream Reconnaissance Report.

• View the Stream Reconnaissance Report (21.7 MB)

To report flooding, drainage, or water quality problems, visit our report a problem page or call us at 206-477-4811.