In the ensuing years, the dike became clogged with vegetation, beginning a trend of desalination and oxygen-depletion that resulted in the demise of native wildlife populations, occasionally in the form of fish kills. In 2004, tidal flow was successfully restored by the National Park Service, working together with other local, state, and federal agencies. In the following year, for the first time since Abraham Lincoln was president, legal-size clams were found in East Harbor. In 2008, the USGS officially renamed Pilgrim Lake, restoring the original appellation of East Harbor.