Located near the Calvary M.E.Church property along the west side of Old Loudon Road (Old State Route 9), which parallels modern Route 9 about one block east and just south of Latham Circle. Church is just north of the intersection of Old Loudon Road and Old State Route 7(Albany County).
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TrailTripTip: To find monument NY21, continue south on Old Louden Road until it rejoins Route 9 south. Follow Route 9 south toward Albany and bear right at modern intersection onto Northern Boulevard. Watch for monument at edge of shopping plaza parking lot on your right.
Context: This marker indicates the continuation of the road to Albany south from Claus's ferry on the Mohawk.