At Siletz I usually launch at the free "ramp" just upstream from the marina, but a 4X4 is advisable since the ramp is just dirt and gravel, and can be a pain when the tide is out. Actually, my boat is a lot smaller and lighter than yours, so I wouldn't recommend it to you.
There's always Coyote Rock
and the marina next to the highway. There's also a beat-up ramp on the seaward side of the bay (on the spit). I've never used it, but it looks OK. It might be a bit of a drive to get to, but at least you won't have to run the channel and risk hitting a deadhead. Speaking of that, the river mouth is full of them, and outside the channel the bay is only a couple of feet deep, but since you have a jet it shouldn't be a big deal. I've seen plenty of boats get stuck out there when they swung too wide (or cut the corner) making the turn to go upriver. I run it with a prop, and other than grazing the bottom once or twice I've never had a problem.
Went Crabbing at Yaquina sunday, only got 6 dungeness and 2 red rocks. They were hard shelled and full. I started at the Marine Science Center and ended up at marker 12 & 14. I left early to avoid the sunday trafic jam at Spirit Mountain.
I went two weekends ago to Siuslaw.... very good crabbing. Got 8 in an hour and a half, and quit. We were camping and didn't need any more than that.
Went fishing this last weekend on Yaquina. People seemed to be doing okay on the crabs. My buddy in another boat got 4 crabs... on two pots and only one one pull (set em before fishing, retrieve on the way to the dock). But.. one of the crabs was starting to go soft.
The "free" launch has always been private property, unfortunately it was posted due to constant garbage being dumped and RVers pitching camp without permission.
As far as crabbing Siletz bay, if you have a depth finder, go for it. The channel is difficult to find during high tides without one.
Many boats have run aground on the way out there so keep a heads up and take it easy out there.
Good luck, I'll offer a Zippered piece of advice, if you have a bit of patience, bring a sturgeon rod. 54 incher last time out there :wink:
Wow, crabbing was great in Siletz Bay. Low pressure, lots of crabs. We could have limited the 4 days we were out there, but we took what we needed. Some soft/light ones were also thrown back. Some old sardine scent with chicken did the trick.
The river fishing was not good for us, very slow, and did not hear of any being caught.