Erin Brockovich-Ellis got into a drunken argument with her husband and tested at more than twice the legal limit Friday evening at Lake Mead.

Brockovich-Ellis was arrested for operating a boat under the influence after registering a 0.190 on a field sobriety test at the Lake Mead marina.

A warden responded to a report of an argument between a man and woman at a temporary slip at the marina. The warden saw Brockovich-Ellis throw a cell phone into the lake, then walk by her husband and slap him.

As she began to pull her boat back into the lake, the warden asked her to stop and helped Brockovich-Ellis bring the vessel back to the slip. She slurred her answers to questions about the argument and later failed a field sobriety test.

Brockovich, 52, is best known for her legal and environmental advocacy work chronicled in a 2000 movie starring Julia Roberts.