Bubbly Creek is the nickname given to the South Fork of the Chicago River's South Branch, which runs entirely within the city of Chicago, Illinois. Gases bubbling out of the riverbed from the decomposition of blood and entrails dumped into the river by the local stockyards in the early 20th century give the creek its name. It was brought to notoriety by Upton Sinclair in his exposé on the American meat packing industry entitled The Jungle.
Meatpackers dumped waste, such as blood and entrails, into the nearest river. The creek received so much blood and offal that it began to bubble methane and hydrogen sulfide gas from the products of decomposition:
“ "Bubbly Creek" is an arm of the Chicago River, and forms the southern boundary of the Union Stock Yards; all the drainage of the square mile of packing-houses empties into it, so that it is really a great open sewer a hundred or two feet wide. One long arm of it is blind, and the filth stays there forever and a day. The grease and chemicals that are poured into it undergo all sorts of strange transformations, which are the cause of its name; it is constantly in motion, as if huge fish were feeding in it, or great leviathans disporting themselves in its depths. Bubbles of carbonic gas will rise to the surface and burst, and make rings two or three feet wide. Here and there the grease and filth have caked solid, and the creek looks like a bed of lava; chickens walk about on it, feeding, and many times an unwary stranger has started to stroll across, and vanished temporarily. The packers used to leave the creek that way, till every now and then the surface would catch on fire and burn furiously, and the fire department would have to come and put it out. Once, however, an ingenious stranger came and started to gather this filth in scows, to make lard out of; then the packers took the cue, and got out an injunction to stop him, and afterwards gathered it themselves. The banks of "Bubbly Creek" are plastered thick with hairs, and this also the packers gather and clean. ”
- Upton Sinclair, The Jungle
The creek has remained toxic to the present day; a resident in the 1950s and '60s remembers the air being "rancid". While the area has been increasingly occupied by residential development such as Bridgeport Village, some wildlife and vegetation has returned in recent decades. A program to oxygenate the creek by continuously injecting compressed air into the water has met with limited success: The creek's odor is much reduced, and fish now venture there.