If the Cross Florida Barge Canal had been built in the 1960s as planned, Marshall Swamp would be 13 feet underwater in the path of the Dosh Reservoir. The plans called for flooding 20 miles of the Ocklawaha River and two miles of the Silver River so barges could cross the state's interior. The natural beauty of these rivers had inspired awe and drawn tourists for decades, and the threat of destruction provoked a surge of grassroots opposition. A coalition of scientists and citizens rallied behind the slogan "Save the Ocklawaha" and turned public and political opinion against the incomplete canal project. Although the reservoir was never built, other canal remnants still stand, including the nearby Marjorie Harris Carr Cross Florida Greenway Field Office, which was originally built as a headquarters for canal management and now serves Florida Park Service staff planning environmental restoration projects and greenway maintenance.