Northbound take the first right turn off the CBBT just past the rest stop and toll booths. Take the next right into the wildlife refuge. At the dead end turn left toward the admin buildings.
Keep your eye open for a right turn that goes down a county road toward a locked private boat ramp with commercial boats tied up. The Yak launch is on your right before the locked gate. It's just a bank you can slide down into a small creek that opens up to the Cut just East of the Little bridge The Yak outfitter by the Hotel uses it too and you may see his outfit parked there.
It's almost any tide, only the lowest of lows dries it out.