Old Speck is within the watershed of the Androscoggin River, which drains into Merrymeeting Bay, the estuary of the Kennebec River, and then into the Gulf of Maine. The north and east faces of Old Speck drain into the Bear River, then into the Androscoggin.
Old Speck is situated within the drainage area of the Androscoggin River, which flows into Merrymeeting Bay, the estuary of the Kennebec River, and ultimately into the Gulf of Maine. The northern and eastern slopes of Old Speck drain into the Bear River, then into the Androscoggin.