Put in at Yarmouth Community Services on East Elm St, take out at the town landing on Old Shipyard Rd.
https://youtu.be/CTeGtw7SA8o?t=451 for footage of first drop and fourth drop.
Comment from 10 years ago:
"Scout all 4 drops before running, this is unrunnable at many water levels. For the first section put in above the Waterworks park and try for the far left drop over the dam. The second drop may be Class VI, to view it follow the footpath down to the Rt1 bridge and look upstream. At high water levels there is a huge ramp of water that I'd love to see somebody try. There is a sneak river right but accessing it is very tough. The thrid drop can very rarely be made. It is a 8-10' poor over dam which can be scouted at Bridge St. A sweet surf wave develops just below the Sparhawk Mill building, park in their dirt lot for some park'n'play. The last drop can be viewed from Grist Mill park or the Rt88 bridge. It is generally runnable at all levels. Watch out at high water, the tide may have changed while you were paddling and turned the last rapid under the bridge into into a giant hole with lots of recirc."
AMC River Guide: Maine by Appalachian Mtn Club