Side scan data of Leschi wall in Seattle

This image is of a popular training site in Lake Washington.  Access is from shore between the swimming dock at Madrona Park.  This site has many rock faces and drops quickly from 70' to 205'.  The erosion channel you see is just to the north of the speed warning buoy.  To the south the bottom becomes sediment slopes at around 180' but to the North rock face continues to 200' before becoming a flat mud landscape.  With rare days of ambient light below 70', very silty rock face and bottom, rapid drops, and vertigo inducing water color this makes for a very good technical diving training site. 

Wreck of the Fresno in Lake Washington

This is image is a sidescan image of the whaling ship Fresno.  The Fresno caught fire while at dock  in 1923 and was a total loss.  The ship was scuttled in 180 feet of water in Madenbauer Bay and broke apart either during the sinking or, more likely, impacting with the bottom.

This image was taken with a hull mounted transducer in rough conditions.  You can see the waves in the rocky hillside at the top of the image.

Side Scan Mosaic in 3D of Sandpoint Area

The below mosaic shows part of the end of the old Navy Runway at Sandpoint in Seattle.  This drops from 20' to 145'.  In the second image you can see a broken wreck.

Mathew's Beach Pipeline Survey and Wreck

These images were created during the testing of a new side scan configuration.  The first shows the side scan mosaic without blending into the underlying map image.  The second shows the shoreline and docks.  When reviewed in Global Mapper the mooring blocks, debris, etc. are clearly visible.

Arrowhead Point Barge

The below image is of the Arrowhead Point Barge.  This is a listed obstruction on most NOAA charts.  In this image you can see equipment on the barge deck as well as planking.

This image shows the wreck in relation to the shoreline.

Dive on unknown target finds home made raft

Chris Borgen and Eric Foreman dove on an unknown target that had proven difficult to image.  This target lies between two rises in the Lake bottom which prevented detailed imagery from a tow fish.  These images were taken with a hull mounted unit.

In this first image you can see the two divers approaching the target.  No bubbles are present as both divers are on rebreathers.  Target depth is 180' fresh water.

This next image is of the same target using a hull mounted side scan.

Sidescan image of the Foss 75 in Lake Washington

These images are of the wreck of the barge Foss 75.  This wreck lies in 125' of fresh water in Lake Washington. 

Diving the wreck of the tug boat "Louie" in Lake Washington

 Here are a few photo's from a dive on the tug "Louie" that Chris Borgen and Erik Foreman did a couple months back. The visibility always seems bad in this particular spot, even for this shallow wreck. This is an enjoyable dive, easily accessible from shore. Photos courtesy of Chris Borgen.

Bow of the Louie

Engine of the LouieWheel house of the Louie

Update on Monday, September 26, 2011 at 11:05AM by Ben Griner

Here is a sidescan image of Louie and a nearby boat.

Side Scan Image of PB4Y Privateer resting in Lake Washington

Lake Washington Dive on a Cannery Tender

Cannery Tender Lake Washington from Dan Warter (DCS Films) on Vimeo.

An old cannery tender in 190 feet of water in Lake Washington.

Thanks to Ben Griner for the use of his excellent boat and equipment, and to Casey Offord for tending.