In North Hudson, the valley becomes less pronounced as the Schroon River reaches its source near exit 30. Here, US 9 and I-87 cross paths again, with the former heading northwest toward Keene and the latter continuing northeast in a narrow valley formed by Ash Craft Brook. After , the stream reaches its source at Lincoln Pond, leaving the Northway to climb in elevation and wind its way northeastward across the surrounding mountains. It reaches slightly more level ground in Westport, where I-87 connects to NY 9N at exit 31. From here, the highway takes a generally northerly track across the Boquet River to the town of Lewis, rejoining US 9 as both roads head toward Clinton County. They split again after as US 9 veers more easterly than I-87 to serve Keeseville. The Northway, meanwhile, heads to the northwest, bypassing the village to cross the Ausable River and enter Clinton County.
In North Hudson the valley becomes less pronounced as the Schroon River reaches its source near exit 30 Here US 9 and I-87 cross paths again with the former heading northwest toward Keene and the latter continuing northeast in a narrow valley formed by Ash Craft Brook After  the stream reaches its source at Lincoln Pond leaving the Northway to climb in elevation and wind its way northeastward across the surrounding mountains It reaches slightly more level ground in Westport where I-87 connects to NY 9N at exit 31 From here the highway takes a generally northerly track across the Boquet River to the town of Lewis rejoining US 9 as both roads head toward Clinton County They split again after as US 9 veers more easterly than I-87 to serve Keeseville The Northway meanwhile heads to the northwest bypassing the village to cross the Ausable River and enter Clinton County