WASHINGTON—The U.S. Coast Guard said Saturday that cleanup crews are responding to a sizable oil spill in the Gulf of Mexico following Hurricane Ida. The spill, which is ongoing, appears to be coming from a source underwater at an offshore drilling lease about two miles south of Port Fourchon, Louisiana. The reported location is near the site of a miles-long brown and black oil slick visible in aerial photos first published Wednesday by The Associated Press. So far, the growing spill appears to have remained out to sea and has not impacted the Louisiana shoreline. There is not yet any estimate for how much oil was in the water, but recent satellite images reviewed by AP on Saturday appeared to show the slick drifting more than a dozen miles eastward along the Gulf coast. Coast Guard spokesman Lt. John Edwards said response teams are monitoring reports and satellite imagery to determine the …