|• elevation||280 feet (85 m)|
|130 feet (40 m)|
|Length||48 miles (77 km)|
|• left||Nicatous Stream|
The Passadumkeag River is a river in Maine. From the confluence of its East Branch and West Branch () in Maine Township 3, Range 1, NBPP, the river runs 48.2 miles (77.6 km) south and west to its mouth on the Penobscot River in Passadumkeag.
|East Branch Passadumkeag River|
|• elevation||282 feet (86 m)|
From the outflow of Weir Pond () the stream runs 2.3 miles (3.7 km) south to its confluence with the West Branch.
|West Branch Passadumkeag River|
|• elevation||299 feet (91 m)|
From the outflow of Number 3 Pond () the stream runs 1.2 miles (1.9 km) southeast to its confluence with the East Branch.