sentences:  In the 1870s a cut-off channel was dug to ameliorate the turn between the old and new channels; the Brewerton Channel was also extended to provide a connection to the Chesapeake and Delaware Canal.Enlarged and extended to access various facilities within the port, the Brewerton and Craighill Channels continue in use to the present, essentially unaltered in configuration.Federal lighthouse construction in the bay began in the 1820s, and one early project was the erecting of range lights to guide ships into the Patapsco.