A manure spill that DNR officials have deemed “acute” has mostly moved downstream along Duck Creek and “is gone,” a tribal environmental expert said. By “gone,” James Snitgen, the Oneida Nation’s water resources supervisor, means it’s diluted enough to be undetectable by eyes or nose. But 300,000 gallons of liquid manure is no small thing, and testing will continue downstream to determine the spill’s impact. Brown County health officials have posted signs at public access points along Duck Creek, warning people not to swim, fish or even wade in the creek, nor to let their pets in, until further notice.