According to the satellite images, the spill directly affected 70,000 sq mi (180,000 km2) of ocean, which is comparable to the size of Oklahoma.[4][49] By early June 2010, oil had washed up on 125 mi (201 km) of Louisiana's coast and along the Mississippi, Florida, and Alabama coastlines.[50][51] Oil sludge appeared in the Intracoastal Waterway and on Pensacola Beach and the Gulf Islands National Seashore.[52] In late June, oil reached Gulf Park Estates, its first appearance in Mississippi.[53] In July, tar balls reached Grand Isle and the shores of Lake Pontchartrain.[54][55] In September a new wave of oil suddenly coated 16 mi (26 km) of Louisiana coastline and marshes west of the Mississippi River in Plaquemines Parish.[56] In October, weathered oil reached Texas.[57] As of July 2011[update], about 491 mi (790 km) of coastline in Louisiana, Mississippi, Alabama and Florida were contaminated by oil and a total of 1,074 mi (1,728 km) had been oiled since the spill began.[58] As of December 2012[update], 339 mi (546 km) of coastline remain subject to evaluation and/or cleanup operations.[59] The reported 3.19 million barrels of spilled oil was not the only affect of this disaster. There was a report detailing the release of thousands of tons of hydrocarbon gases (HC) into the atmosphere.