A storm surge covered barrier islands as the storm blew through, and some inland roadways were flooded as well. The National Weather Service in Mobile cautioned that the Styx River near Elsanor, Alabama, could reach moderate, and possibly major, flood stage later Wednesday.
But the storm's impact could have been worse: Gordon gave only a glancing blow to New Orleans, where Mayor LaToya Cantrell said the city now has "the pumps and the power" needed to protect residents inside the levee protection system.
There were no immediate injury or damage reports, other than the tree that fell on the mobile home in Pensacola. The Escambia County Sheriff's office posted on its Facebook page that responding deputies discovered that the child had been killed. The name and age were not released.
More than 27,000 customers were without power as Gordon began pushing ashore, mostly in coastal Alabama and the western tip of the Florida Panhandle around Pensacola, with a few hundred in southeastern Mississippi. Crews were already restoring electricity early Wednesday in the wake of the storm.
Rain was still falling but the lights were on Wednesday morning at a Waffle House restaurant in Mobile, where factory worker Jerome Richardson said he lost power in the storm Tuesday night. He was still without electricity as he left for his 12-hour shift.
"I just hope I don't have to throw out everything in my refrigerator when I get home," he said.
Driftwood and other debris on the causeway made for hazardous driving early Wednesday to nearby Dauphin Island, where streets were submerged in seawater overnight. Mayor Jeff Collier had warned ahead of the storm that his community might get cut off.
"When you get the higher waves, water starts splashing across. Sometimes it starts pushing not only water across but debris, logs and things of that nature, which makes it very treacherous to get across," he had said.
The last hurricane to strike the U.S. was Nate last October, coming ashore in Biloxi with 75 mph (120 kph) winds.
Governors in Alabama, Mississippi and Louisiana all declared states of emergency to better mobilize state resources and National Guard troops for the storm. Mississippi shut down a dozen Gulf Coast casinos. Workers on at least 54 oil and gas production platforms were evacuated. Communities along the coast provided sand and bags, and many hustled to protect their properties ahead of the storm.
Gordon was not the only storm being watched by forecasters. Hurricane Florence was some 2,400 miles (3,900 kilometers) away from the U.S., and lining up behind it, another potential storm was likely to form not far off the coast of Africa.
It's way too early to know if either of those storms will have any impact on land, but Hurricane Center Director Ken Graham said attention should be paid: "It's the peak of hurricane season. Now is the time to get your plans all set," he said.