[7] Sparkill Creek rises along the south border of Blauvelt State Park on the western flank of Clausland Mountain, part of the Hudson River Palisades.

Turning south again, the creek passes through downtown Tappan and crosses the New York border, entering Northvale, New Jersey.

The creek abruptly turns to the east in Northvale, flowing a short distance before crossing the state line again and reemerging back into New York.

This section of the creek was once navigable to commercial vessel traffic from the Hudson River, but it is now blocked by a low, fixed span, the Ferdon Ave Bridge, a quarter mile downstream of the former mill complex.

Immediately before the Ferdon Ave Bridge is its predecessor, the Sparkill Creek Drawbridge, which when operational opened to allow Hudson River vessel traffic to travel upstream.

The portion of Sparkill Creek downstream of the Ferdon Ave Bridge is navigable to motorized vessels, and homes along this section of the waterway have docks for their watercraft.

It flows generally north through New Jersey, beginning in Alpine and coursing through Norwood and Rockleigh before crossing the New York State border and merging with Sparkill Creek between the hamlets of Tappan and Palisades.