Lock 28 drift? My favorite! I highly recommend taking a flag/bouy along with you... Lots of boating and fishing in the area.
As the others have said, park at the end of Galop Canal and walk over the footbridge, hang right and you'll see your entry. I'm not sure about the 10' jump but you can walk down into the old lock and do a standard shore entry. They've recently mowed all the tall grass/weeds and chopped down a lot of the trees so it's a much more pleasant walk.
From shore you can swim around the Weehawk, it's small honestly. When you're done head north and let the current do the work. From the time you start into the current; the drift should take 15-20 minutes before you'll get pulled south and shot out into the river. Keep in mind the boat traffic, they're coming around a corner and might not see the flag in time and the shoot-out is pretty shallow,
stay low. Otherwise, it is the best part of the dive! Keep an eye on the bottom at set yourself up at about 20'. Just as you're wondering if you've somehow missed the wreck, it'll be right in front of you.
If you have two vehicles you can do the car shuffle and end your dive on the Connie. Otherwise if you have plenty of air you can exit at the Connie, walk to the end (near where you shot out), hop back in on the north side and swim northwest back to the bridge on Galop Canal that you drove over to park. The shore exit involves going over an old sluthesgate, the current can be pretty harsh at that point though, but the stairs are no picnic either. I typically just end the dive with a few laps of the Connie.