Royal Park Bridge rubble Upsidedown House 71/80 26 47.687 80 01.049 (SE Corner, top) Knob Rock(top) 62/81 26 47.703 80 01.056 Jagged Wall (top) 65/81 26 47.730 80 01.058 Second Bridgehouse 63/82 26 47.746 80 01.054 (SE Corner, top) Barge/Tugboat 74/81 26 47.710 80 01.100 (~330' at 300 heading from Upsidedown Bridgehouse) NW Barge 75/82 26 47.772 80 01.063 (~200' at 340 heading from second bridgehouse) 1st four locations data taken on 4 August 2001. Barge data taken March 2003.