In order to provide a straighter deeper channel in the lower reaches Brisbane River, it was decided in 1889 to relocate the mouths of creeks and eliminate all of islands by a combination of removal by dredging and incorporation as part of the river bank. In the case of Doughboy Creek (now Bulimba Creek) and Gibson Island, it was decided to relocate the creek mouth then at approximately (to the west of Gibson Island) to the eastern end of Gibson Island (its current mouth) by closing the original mouth with a training wall diverting the flow of the creek into Aquarium Passage () which separated Gibson Island from the southern bank of the Brisbane River. The Doughboy training wall was built from 1900 to June 1902 and was long. As a result of the training wall, an isthmus (approximately wide as at 2020) formed at the original mouth of the creek permanently connecting Gibson Island to Murarrie.