AFTER four years and 91 missions, Eco Barge Clean Seas has reached the milestone of 100,000 kilogram of collected marine debris from the Whitsunday region after their trip on Monday.

Founder of Eco Barge Libby Edge said the achievement was bitter-sweet.

"While we are so proud of this achievement and are celebrating the amazing efforts of the community and all our volunteers, I never imagined that our waters would carry so much debris," she said.

By keeping the Whitsunday Marine Debris Removal Program running with a minimum of three trips per month, Eco Barge Clean Seas can keep on top of the accumulation of this debris arriving on the south-east facing Whitsunday beaches.

Ms Edge said this was particularly important as research had indicated marine debris was returning at a rate in excess of two kilograms each day at some locations.

In addition, the Eco Barge Open Day was a celebration of the organisation's success over the past 12 months and community members were invited to come and enjoy the family-friendly event at the Eco Barge headquarters on Sunday.

"We wanted to take the opportunity to thank all of our wonderful volunteers that have helped us have such a successful year with our Caring for Our Country Grant," Ms Edge said.

"Thanks to this grant we have collected just under 25,000 kilograms of marine debris since October last year so that's over 300 volunteers coming in from the community to help us."

Eco Barge is now focusing on launching their new project which aims to turn the Eco Barge HQ into an Environmental Discovery Centre.

Ms Edge thanked sponsors Starfish and Reef Catchments for their support.

For more information, visit www.ecobargecleanseas.org.au.