Cook Inlet Navigation Channel, Knik Arm, Alaska


Notice Number: 12002
Local Number:
POA 20-02
Effective: 06/09/2020 14:00 thru 04/20/2021 08:00 AKDT


  1. All navigation interests are advised that the U.S. Army Corps of Engineers (USACE), Alaska District conducted a project condition survey for Cook Inlet Navigation Channel on 12 May, 2020 in which the following controlling depths in feet (FT) mean lower low water (MLLW) were recorded:


  • Left Outside Quarter W150°05'48.13" N61°12'0.60" -34.7 FT MLLW
  • Left Inside Quarter W150°05'49.11" N61°11'58.71" -38.2 FT MLLW
  • Right Inside Quarter W150°04'43.50" N61°12'10.10" -41.1 FT MLLW
  • Right Outside Quarter W150°06'08.66" N61°11'45.46" -37.2 FT MLLW


  1. A chartlet of the controlling depths as well as survey data are available on the USACE Navigation Portal website at: https://navigation.usace.army.mil/Survey/Hydro


  1. The Cook Inlet Navigation Channel was dredged during the summer of 2014 to a project depth of -38 FT MLLW. At this time, no maintenance dredging is scheduled for this channel during 2020.


  1. The next project condition survey for this channel is tentatively scheduled for May 2021.


BE ADVISED: The information depicted on maps, charts, drawings, navigation notices, etc., for the subject project, represents the results of a survey conducted on the date(s) indicated and can only be considered to represent the general condition existing at that time. The survey data was collected under a USACE contract for the purpose of characterizing the condition of the navigation channel, and the area for placement of dredged material for future channel maintenance operations. As such, the information is only valid for its intended use. This information can be used to supplement existing published navigation charts. The user is responsible for the results of any application of the survey data for other than its intended purpose and should consider the contents, timeframe of data collection, and accuracy specifications for survey data collection/processing. Additionally, bathymetry in Cook Inlet is subject to drastic and continuing change. Prudent mariners should not rely solely upon this information. The USACE encourages users to submit inquiries, discrepancies, or comments about this information to Donna West, Operations Project Manager (907-753-2761).




Julie Anderson, P.E.
Chief, Operations Branch
Engineering and Construction-Operations Division