LOS ANGELES (AP) — A state board has ordered the U.S. Army Corps of Engineers to mitigate damage caused to 49 acres of wildlife habitat at two sites along the Los Angeles River.

The Los Angeles Times says the Los Angeles Regional Water Quality ControlBoard gave the Corps 60 days to submit a plan for restoring the areas.

The board's executive officer said in a letter that the agency will file a federal lawsuit if the Corps refuses to comply.

An Army Corps spokesman says the letter is under review.

The order comes after the Corps failed to obtain authorization to dredge and fill two sites along the Los Angeles River in 2012 and 2011.