In Lowell, the Merrimack River falls about 32 feet over the course of a mile, starting here at the Pawtucket Falls.  You can barely see the dam in this photo, taken when the water level was especially high. To learn about what is pictured here, scroll over the picture and find 5 hidden items.  When your cursor changes to a "hand" icon, just left-click, and a picture with a caption will appear.  To return, scroll down and click "Close."