This is a great dive for Seattle divers wanting to do something different. I free dove this site for years, and went back with tanks after getting certified and had an enjoyable dive. 16th Ave is along an artificial inlet used by Foss Tugs, so after you enter the water, stay close to shore and surface swim or descend and head south along the shore to the corner of the inlet. This section is shallow, but has rocks and pilings and we have seen giant skates, ratfish, perch, rockfish and others along here, so keep your eyes open. When you get to the corner of the inlet the shore turns east towards the grain terminal and Seattle. From this corner, a mound of rock extends out to the south. The mound is interesting and has rockfish, cabazon, and others, but be aware that it takes you out away from shore and into busy Elliot bay. You probably wouldn’t want to surface out there. The shore heading towards the grain terminal is made up of large rocks like a breakwater and is covered in kelp. We find rockfish, lingcod, sculpins, etc. along here. You don’t need to go deeper than 30 feet at this site as the bottom turns into sandy gravel and doesn’t have much to offer. Be aware that there is a fishing dock near the terminal so don’t get to close. This site is inconsistent in many ways. Sometimes there are lots of fish, sometimes it seems a desert. The vis is usually similar to Alki Point, but avoid low tides as the wakes from the ferries and containerships can stir up the water in a hurry!