sentences:  From here to Watertown, I-81 loosely parallels Lake Ontario, located about to the west and more closely followed by NY 3.Another substantial stretch of open, rolling fields brings the route to Sandy Creek, where it connects to County Route 15 (CR 15), a highway designated NY 288 during the 1930s.Past Sandy Creek, I-81 proceeds into Jefferson County, where it continues to travel across rural, undeveloped areas with only gentle elevation changes.