06/09/2013 at 10:00 AM EDT
Erin Brockovich-Ellis, the legal advocate portrayed on screen by Julia Roberts
, was arrested for boating while intoxicated on Lake Mead near Las Vegas.
Brockovich-Ellis, 52, was booked into the Clark County Detention Center on Friday night and posted $1,000 bail.
A game warden who saw Brockovich-Ellis having trouble docking a boat on her own gave her assistance and then noticed she had slurred speech, Edwin Lyngar, a spokesman for the Nevada Department of Widlife, tells the Las Vegas Review-Journal.
"She was obviously struggling to put the boat in the slip, and if you've had any experience, it's a simple enough operation," said Lyngar.
A field sobriety test showed Brockovich-Ellis was "significantly" over the .08 percent legal threshold for operating a boat, says Lyngar.
Brockovich rose to fame when, despite having no legal training, she helped construct a winning case against the Pacific Gas & Electric company, accusing them of polluting the drinking water in a small Southern California town. Her story was depicted in 2000 in the movie Erin Brockovich