 North of Lake George , I @-@ 87 narrows from six to four lanes as it runs alongside US 9 to Warrensburg , a small hamlet on the Schroon River served by exit 23 . While US 9 heads northwest into the community , I @-@ 87 turns northward to follow the east bank of the Schroon River for 17 miles ( 27 km ) through a deep , remote valley . The stretch ends at exit 27 , where I @-@ 87 reconnects to US 9 at the southern tip of Schroon Lake . At this point , I @-@ 87 makes a slight turn to the northeast to follow US 9 as the latter road runs along the western shoreline of Schroon Lake . Both roads pass a handful of lakefront properties on their way into Essex County and the town of Schroon , where the lake comes to an end and NY 74 begins its eastward trek to Ticonderoga at exit 28 . The Schroon River resumes north of the exit , and I @-@ 87 and US 9 follow the river and its rural valley to the northeast for 15 miles ( 24 km ) to the town of North Hudson . 
