BURBANK, Wash. – The U.S. Army Corps of Engineers’ Walla Walla District (Corps) is seeking input on the Ice Harbor navigation lock upstream floating guidewall cables repair.
The comment period will be open from Dec. 12 to Jan. 13. The Corps proposes to repair the cable anchoring system used for the floating guidewall at the navigation lock upstream gate. The steel cables have deteriorated and need to be replaced.
To address this situation, the Corps proposes to remove up to 2,000 cubic yards of sediment from the river bottom anchor location using a hydraulic pump with a suction hose. The resulting slurry of dredged material and water would be pumped through a hose to an in-water disposal area on the upstream side of the dam. This disposal area is enclosed downstream by Ice Harbor Dam and upstream by the old coffer dam used during construction of the navigation lock. The Corps anticipates the old coffer dam would act as a berm to help contain the sediment.
More information can be found through the Corps’ website at: www.nww.usace.army.mil/Missions/Environmental-Compliance/.
Comments may be filed online at: http://www.nww.usace.army.mil/EnvironmentalComplianceComment/ or via email to NEPANWW@usace.army.mil, inserting “Ice Harbor Guidewall Repair” in the subject line. Comments may also be mailed to:
U.S. Army Corps of Engineers, Walla Walla District
CENWW-PPL-C – Ice Harbor Floating Guidewall
201 North 3rd Avenue
Walla Walla, WA 99362-1876
For additional information, contact Ms. Sandra Shelin, Environmental Resource Specialist, at 509-527-7265.
Release no. 19-111