Volunteers have picked up more than 36,000 pounds of trash along Lake Powell's shoreline this year.
The work is part of a program known as Trash Tracker. Volunteers spend at least five days on a houseboat in search of litter. They collected 22 mattresses, thousands of aluminum cans and plastic bottles, and hundreds of golf balls on 25 trips this year.
The lake lies within the Glen Canyon National Recreation Area in Arizona and Utah. Officials say some beaches and canyons have been forced to close in the past because of litter.
The Trash Tracker program started in 1989 and has volunteers from all across the country.
The next application period opens Feb. 1.
