I'd be super interested on some info regarding this as well, I'll be staying out in Yachats for the next couple/few days and was planning on doing a little Siuslaw bank fishing, but would really like to try up the Alsea a bit as well. I drove 3 or 4 miles up the hwy this morning before I got to my base-camp, and only found one turn-out that looked like I might be able to get down to the water (just west of the bridge and group-only campground) but I saw a bunch of dudes in boats out there this morning.
I've been 20 or so miles back there earlier this summer and spent a night at blackberry but without a boat I'm curious as to what spots I should try for, especially while the water's still this low.