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.