The two men endured the most difficult conditions one could imagine. They probed through a swamp infested with mosquitoes...And then came the moment of success.
Well, Gallagher/Harrison evidently did have to paddle around some obstacles, but they didn't see their bird until shortly after they crossed under Highway 17, where Gallagher says "the din from semis was almost unbearable". In "The Grail Bird", Gallagher's account of the trip mentions that it was chilly at night (it was late February, after all), and the word "mosquitoes" doesn't appear.