Recreational Boating Information for the Northwest

Notice To Mariners | 13th District
Weekly notices from the United States Coast Guard and Home Land Security. 
notices can obtained via e-mail subscription through the USCG Navigation Center.  website: LOCAL NOTICE TO MARINERS - USCG NAVIGATION CENTER

Note: not all notices are posted on our page. Only information pertaining to Puget Sound, San Juan Islands and Lake Union / Washington. Click link above for complete details for the 13th district or any other district within the United States.

Latest USCG District 13:


  • 01-15 1st Weekly Edition (PDF
  • 02-15 2nd Weekly Edition (PDFNew!

WK 52-14: LAKE WASHINGTON – SR-520 Special Bridge Notice - Critical Navigation Notice Part A (Revised from LNM 51/14)
As early as February 2015, construction activities for the new floating bridge will completely block the drawspan on the existing SR 520 floating bridge. At this time, boat traffic will no longer be able to use the draw span to navigate through the SR 520 floating bridge. Vessels more than 58 feet tall will not be able to navigate beyond SR 520 until the existing bridge is removed from Lake Washington, currently planned for late 2016. The new floating bridge will not have a draw span, but the east navigation channel will be 70 feet tall when complete. 

Until the center draw span is permanently blocked in February of 2015, the U.S. Coast Guard has revised the draw span operating schedule for the SR-520 Evergreen Point Floating Bridge. Construction activities will continue for the duration of the bridge replacement project until approximately 30 Aug 15. Vessels which are impacted by the closure of the east channel that are not able to navigate through the west channel of the existing bridge may request an opening of the center draw span for passage. Boaters may request a draw span opening by calling WSDOT at (206) 440-4490. Eight temporary white mooring buoys (six on the north side and two on the south side) marked with white lights flashing every 4 seconds (Fl W 4s) have been deployed near the bridge for the mooring of construction barges and shown as chart corrections in LNM 05/13 for chart 18447. For up to date schedule changes and special event schedules for the SR-520 Bridge, please visit WSDOT’s web site at:

WK 52-14: LAKE WASHINGTON – SR-520 Special Bridge Notice - Critical Navigation - Notice Part B (Revised from LNM 51/14)
The Evergreen Point Floating Bridge (SR-520) between Seattle and Bellevue shall operate as follows (revised schedule):

East Span:
  • 1. Currently, the east navigation channel under SR-520 is blocked by construction activities. When open, the navigation channel will be marked with green and red buoys. A chart of the channel is available from the WSDOT web site. Unfortunately, due to construction equipment that cannot be moved, the vessel clearance within the navigation channel has decreased from 64 feet to 58 feet. All mariners with vessels taller than 58 feet must continue to use the floating bridge center draw span. Note: As soon as the center draw span is permanently blocked starting as early as February 2015, the East navigation channel will be open and allow passage of vessels up to 58ft.

Center Span:
  • 1. The draw need not open from 0630 to 0959 and from 1500 to 1900 Monday through Friday, except Federal Holidays other than Columbus Day.
  • 2. The draw need open only on the hour and half hour from 1000 to 1430 every day of the week, if at least 2 hour advance notice is given.
  • 3. The draw will open on request at all other times if at least 2 hours advance notice is given.
  • 4. Telephone requests for bridge opening may be directed as collect calls to the Highway Radio, or made by direct telephone communication through the Seattle Marine Operator, Station KOH, or through other marine wire or radiotelephone service. Note: The draw span will be permanently blocked starting as early as February 2015.

West Span:
  • 1. Vessel traffic is restricted to a narrow navigation channel marked by red and green buoys, shown in enclosure (6) of LNM 47/14. Exclusion area buoys and signage will mark the four Pontoon Alpha submerged anchor wires.
  • 2. Eight temporary pilings (two groups of four pilings) marked with yellow lights flashing every 4 seconds (Fl Y 4s) have been placed in the southeast part of Union Bay near the west end of the bridge for the temporary mooring of pontoons. Refer to LNM 05/13 chart 18447 for temporary chart corrections.
  • 3. The west channel has a vertical clearance of 45 feet.
  • 4. 12 temporary barge mooring pilings have been placed on the north side of the bridge just west of the west navigation channel. All 12 pilings are marked with quick flashing yellow lights (QY), which may be obscured at times when barges and other equipment are moored at the site.

West Approach Project:
A temporary trestle structure is being constructed along the existing SR520 bridge. It will extend from the west end off the existing SR520 bridge and extend to the new SR520 bridge construction. The trestle will be lighted with white flashing lights spaced every 100 feet and with retro reflective material. Construction of the trestle will be Monday through Saturday, 0700 until 0500 the next day. The temporary trestle will be in place until June 2017. No public access will be allowed near or under the structure, and mariners are requested to approach the construction no closer than 300 feet.​

WK 51-14: WASHINGTON – OLYMPIA HARBOR – South Budd Inlet dredging
Orion Marine Group is conducting maintenance dredging operations at the Port of Olympia Marine Terminal in Olympia, WA. Dredged sediments will be loaded onto barges for disposal at a landfill ashore. The derrick barge Rainier and one or two flat deck barges will be on site from 08 Jan 15 through 15 Feb 15. Hours of operation will be from 0500 to 1700, Monday through Friday. Derrick barge Rainier will monitor VHF-FM channels 13 and 14. Tug Skagit will be on site to assist with all moves. The barge will be marked at night with steady burning white lights at the corners. Mariners are requested to reduce wake in the vicinity of the work area. For additional information contact Mr. Casey Shaw at (253) 298-2243 or email at

WK 36-14: SWINOMISH CHANNEL SOUTH ENTRANCE – Scheduled Dredging in September 2014
American Construction Co., Inc. will conduct dredging operations between Swinomish Channel South Entrance Buoy 1 (LLNR 18785) and Swinomish Channel South Entrance Light 11 (LLNR 18815). Dredging will commence on or about the week of 25 Sep 14 and continue to no later than 15 Feb 15. Operations will be conducted 7 days a week, 24 hours a day until complete. The dredge barge DB Mukilteo and dump scow Lummi Island will be utilized. All dredged material will be towed to and dumped at the Rosario Strait Open Water Dump Site via Swinomish Channel with Deception Pass as an alternate route. Mariners are advised to use caution when transiting the waterway due to the shoaling that is being dredged and observe a no wake request of the operator. All deep draft vessels, including sail boats, are requested to contact the DB Mukilteo foreman on VHF-FM channelS 68, 69, or 78 or mobile phone 425-870-3226.

Construction of the Explosives Handling Wharf (EHW) #2 at Bangor Submarine Base at approximate position 46-45-09N 122-43-23W is being conducted until 09 Jan 16. There may be up to eight anchor buoys and two mooring buoys deployed in the area immediately surrounding the work site. Mariners can expect material barges, crane barges, tug-push boats, and work skiffs within the vicinity of the EHW piers. The majority of activity will occur within the floating security barrier. Mariners are requested to transit at a slow speed and reduce wake. Working vessels will monitor VHF-FM Channels 18A and 88A. For more information, contact Mr. Bill Eskins at (678) 449-8650.

The entrance to the southern Swinomish Channel has a history of shoaling, therefore, mariners are advised to transit this waterway at the highest tide possible and exercise good seamanship and voyage planning. Multiple vessel grounding has occurred in the channel westward of Goat Island between Swinomish Channel South Entrance Light 11 (Light List number 18815) and Swinomish Channel South Entrance Buoy 1 (Light List number 18785).

WK 17-14: WASHINGTON – HOOD CANAL – SEABECK – Temporary lights
Four (4) flashing yellow four second lights have been temporarily set at approximate position 47-38-36.1N, 122-49-47.7W. These lights are temporarily in place while a new marina is constructed in Seabeck, WA.

WK 11-14: WASH. – ADMIRALTY INLET - Virtual AIS position Puget Sound Traffic Separation Lane “SB” to be created
The U.S. Coast Guard will be creating a Virtual AIS (Automatic Identification System) identifier at the following position in Admiralty Inlet: Puget Sound Traffic Separation Lane V-AIS “SB” (LLNR 16502) in position: 48-06-47.016N 122-29-40.428W The Virtual AIS message will not correspond to any physical buoy but will be broadcasted from an AIS Base Station to coincide with the position listed above. Vessels with AIS capable systems will be able to see the symbology and other information on their displays. For more information about AIS, Mariners should read enclosure (6) to this Local Notice to Mariners and/or go to the U.S. Coast Guard Navigation Center website page

WK 10-14: WASHINGTON – PUGET SOUND – SHIP CANAL – Changes to Aids to Navigation at Shilshole Bay Entrance
The U.S. Coast Guard is proposing to make a number of changes to the Aids to Navigation for Shilshole Bay Entrance. These changes are proposed due to consistent discrepancy status of the Shilshole Bay Entrance Range. To correct these discrepancies would entail the removal and brushing of a vast number of tress at the Commodore Park, and on private property. This proposal is designed to eliminate the need to remove the foliage and still provide navigational safety at the entrance. The following changes would be made: 

  • Shilshole Bay Approach Lighted Buoy “S” (LLNR 16785 & 18110): Disestablish as no longer necessary for safe navigation.
  • Shilshole Bay Entrance Buoy 1 (LLNR 18125): Change to Shilshole Bay Entrance Lighted Buoy 1, with a green flashing light, every 2.5s (Fl G 2.5s) and a nominal range of 4 NM.
  • Shilshole Bay Entrance Buoy 2 (LLNR 18130): Change to Shilshole Bay Entrance Lighted Buoy 2, with a red flashing light, every 2.5s (Fl R 2.5s) and a nominal range of 4 NM.
  • Shilshole Bay Breakwater Light 3 (LLNR 16790 & 18140): Change the light characteristic to a green flashing light, every 4s (Fl G 4s) to prevent misidentifying the light with Shilshole Bay Entrance Lighted Buoy 1.
  • Shilshole Bay Entrance Range Front Light (LLNR 18115): Change to Shilshole Bay Entrance Direction Light, displaying an green Occulting light every 4s (Oc G 4s), increase the intensity and narrow the display of the light to be shown 1.5° either side of the channel

Map Overiew: