Last week’s storms caused raw sewage to flow into the Chesapeake and Ohio Canal near Washington, National Park Service officials said Saturday, warning that no one should fish or recreate in the affected stretch of water until mid-day Sunday.

The heavy rain caused sewage to overflow a manhole along DC Water’s Potomac Interceptor, affecting the canal below Lock 6, near Cabin John. Officials advised anyone who has visited that part of the canal recently to sanitize materials and equipment that came into contact with the water.

The canal’s towpath, which is popular with hikers and bikers, is open. But due to a much larger sewage spill, the Capital Crescent Trail remains closed between Fletcher’s Cove and Water Street in Georgetown. Officials have advised the public to stay out of the Potomac River below Fletcher’s Cove until mid-day Monday.