There, the Crowe River passes over Marmora Dam,[2] heads southwest into the township of Stirling-Rawdon, passes over two one-metre (3 ft 3 in)-high and 40-to-60-metre (131 to 197 ft)-wide falls at Callaghan's Rapids Conservation Area,[4] enters the municipality of Trent Hills in Northumberland County, flows over Allan Mills dam,[2] passes over several falls at Crow Bridge Conservation Area,[5] and reaches its mouth at Crowe Bay on the Trent River, just upstream of the Trent–Severn Waterway Crowe Bay lock and dam.

The Trent River flows to the Bay of Quinte on Lake Ontario at Trenton.

[6] The northern part of the watershed is sparsely inhabited Canadian Shield terrain.

At Marmora, the watershed enters Paleozoic limestone-plain country, with unusual outcroppings of Canadian Shield through the limestone at Allan Mills and just above Crowe Bridge.

[citation needed] The river drains an area of about 2,000 square kilometres (800 sq mi).