The U.S. Army Corps of Engineers wrapped up its $1.1 million cleanup of the Dakota Access pipeline protest camps on federal land in North Dakota, hauling away 835 dumpsters of remaining trash and debris. The site, once occupied by thousands of environmental demonstrators, is now vacant.

The federal cleanup at the last of the three camps, Sacred Stone, was declared finished Thursday.

A Florida sanitation company completed work that began Feb. 23 to hasten the massive restoration project started in late January by the Standing Rock Sioux.

Meanwhile, a local animal shelter rescued four more dogs found at the North Dakota encampment, bringing the total number of dogs found after the last of the protesters evacuated to 12.

“We are happy to report that all animals have been accounted for throughout the Dakota Access Pipeline protest sites,” Furry Friends Rockin’ Rescue of Bismarck-Mandan said in an online post.

The tribe, aided by state and local agencies as well as some protest volunteers, launched the cleanup over concerns that snowmelt would inevitably wash tons of garbage and waste left by protesters into the Cannonball River.

Corps Capt. Ryan Hignight said a total of 8,170 cubic yards of debris was removed from the three camps — Sacred Stone, Oceti Sakowin and Rosebud — all within the flood plain on federally managed land.

“In total, there were 835 roll-off dumpsters of trash and debris removed from the three camps together,” Capt. Hignight said in an email.

Some items, including propane tanks and lumber, were set aside for recycling, The Associated Press reported.