Lindley Park looks to be at a good stretch of the Alsea for fall salmon fishing, it is an old campground converted to free day use.  Parking is in the old campsites.

The kayak slide is not really developed, more of a muddy gap in the grass, dropping down to the river.  Pulling a kayak on wheels up the slide is going to be slightly fun because the footing doesn't look very good. 

People with docks along the river might not like the idea but it looks like a great location for a small public boat launch, the old campground area looks to be large enough for a decent parking area.  cheers, roger