The proposed route skirts the Standing Rock Sioux tribe’s reservation and crosses under Lake Oahe, a Missouri River reservoir in the Dakotas that serves as the tribe’s drinking water source.
April 2016 — Opponents establish a camp in southern North Dakota for peaceful protest.
The Standing Rock Sioux sues.
Aug. 10 — North Dakota authorities make the first arrests of protesters.
April 4 — The pipeline leaks 84 gallons of oil at a rural pump station in South Dakota.
Trump later rejects the request.
June 14 — Boasberg orders the Corps to do more environmental assessment of the pipeline’s impact on the Standing Rock Sioux.
June 27 — North Dakota’s Private Investigative and Security Board sues TigerSwan for operating in the state without a license.
Oct. 10 — The North Dakota Pipeline Authority says the pipeline boosted the state’s tax revenues by about $19 million in its first three months of operation.