Statistics for occurrence #1 of “Billerica” in chapter 1 of Medford Historical Society Papers, Volume 7.:
...hese latter, which varied from one to six miles in length, sixteen locks, like huge steps, were built, overcoming a rise of one hundred and four feet from tide water at Charlestown, to the Concord at Billerica , and a descent of twenty-six feet to the Merrimack at Chelmsford. Five others provided entrance into these rivers, and also into the Mystic at Medford, while suitable waste weirs were placed contig...
|Max. Freq.||Min. Freq.|
|†||Billerica (Massachusetts, United States)||452||14||6||0||0 user votes|
|†||Billerica (Massachusetts, United States)||4||2||0||0||0 user votes|