Mentor in Lake County, Ohio — The American Midwest (Great Lakes)
When Disaster Strikes
In 1967, the Cleveland Museum of Natural History's phones began ringing with calls from frantic locals stating the marsh was dying. The cause was a privately owned 54-acre parcel of the marsh that had been used as a disposal site for approximately 255,150 tons of salt-mining byproduct in 1966.
The Mentor Marsh was a lush swamp forest in 1960. Large stands of dead trees surrounded by hybrid cattail and Phragmites in Mentor Marsh in 1967. Photo: CMNH Archives Salt tailings from the property leached into the marsh through Blackbrook Creek, raising the salinity of the marsh and killing off native trees and plants. Ohio's first nature preserve was rendered a near barren wasteland.
Due to its tolerance to high salinity and brackish waters, the invasive Phragmites australis (common reed grass) quickly created a dense monoculture, which choked out remaining native species. Eventually, Mentor Marsh became the largest phragmites invaded wetland in the state of Ohio.
Following the salt-fill tragedy, the Mentor Marsh suffered twelve major fires between 1979 and 2013. With flammable dense stands of phragmites, the fires expanded quickly and caused great risk to wildlife, humans, and residential structures. Unfortunately, fire did not eradicate this species, as the roots of this plant remained intact and new growth recolonized burned areas.
The largest fire occurred in 2003, covered 400 acres and destroyed the Wake Robin Boardwalk. During the reconstruction of the boardwalk, a phragmites-free buffer zone was created to help protect the structure in the event of a future fire. A glimmer of hope returned when native plants began emerging from the seedbank.
Erected by City of Mentor; Ohio Department of Natural Resources; National Oceanic and Atmospheric Administration, U.S. Department of Commerce; Ohio Coastal Management Program; Cleveland Museum of Natural History; Chagrin River Watershed Partners; Marsh Area Regional Coalition; Lake Soil & Water Conservation District; City of Mentor Natural Resources; Blackbrook Audubon Society.
Topics. This historical marker is listed in these topic lists: Disasters • Horticulture & Forestry • Parks & Recreational Areas • Waterways & Vessels. A significant historical year for this entry is 1967.
Location. 41° 43.619′ N, 81° 20.227′ W. Marker is in Mentor, Ohio, in Lake County. It is at the intersection of Harbor Drive and Mentor Marina, on the right when traveling north on Harbor Drive. Touch for map. Marker is at or near this postal address: 8365 Harbor Dr, Mentor OH 44060, United States of America. Touch for directions.
Regionally, this marker is in Greater Cleveland, on the Lake Erie Shore, and in the Western Reserve. It is also in the American Midwest and on the Great Lakes. Globally, it is in North America, the Western Hemisphere, the Western World, and the Anglosphere. Historically, it finds itself in what was once the Haudenosaunee (Iroquois) Confederacy, the territory of the Mississippian Culture, and the Northwest Territory.
Other nearby markers. At least 8 other markers are within walking distance of this marker: Restoring the Marsh (a few steps from this marker); Habitat for Many (within shouting distance of this marker); Chimney Swift (within shouting distance of this marker); Mentor Marsh (about 300 feet away, measured in a direct line); Mentor Lagoons Nature Preserve (about 300 feet away); a different marker also named Mentor Lagoons Nature Preserve (about 600 feet away); Mentor Lagoons (about 700 feet away); Marsh Settlement (about 700 feet away). Touch for a list and map of all markers in Mentor.
Credits. This page was last revised on May 29, 2026. It was originally submitted on May 21, 2026, by Craig Doda of Napoleon, Ohio. This page has been viewed 15 times since then. Photos: 1, 2. submitted on May 21, 2026, by Craig Doda of Napoleon, Ohio. • Devry Becker Jones was the editor who published this page.

