Feb 7 (Reuters) - The U.S. Army Corps of Engineers has granted the final easement needed to finish the controversial Dakota Access Pipeline, according to a court filing Tuesday.

The line had been delayed for several months after protests from Native American tribes and climate activists. The $3.8 billion line, which is being built by Energy Transfer Partners, needed a final permit to tunnel under Lake Oahe, a reservoir that is part of the Missouri River.

President Donald Trump, days after being sworn in, issued an executive order directing the U.S. Army Corps to smooth the path to finishing the line. (Reporting By Valerie Volcovici; editing by Diane Craft)