Since Toledo has no decent ramps, (walbridge has like an 8 foot dock and cullen is usually a mess with newbies and I still don't trust the recent dredging work when the wind is blowing from the southwest from August through October)... I use Bolles Harbor for my ramp of choice. It has enough ramps to accomodate a bunch of boats and the water is reliably deep in the later season.
They are closing it.
http://www.monroenews.com/news/2012/aug/15/bolles-harbor-access-site-closing-construction/
I kind of wish that I didn't buy a season pass.
Wanted to give the heads up to other boaters, as one would NEVER expect the largest boat ramp on the western end of the lake to close in the middle of the boating season.