Porcupine River Professional Review and Guide
"The Porrupine offers an excellent novice river trip for those experienced in remote wilderness travel and is an ideal river for a family expedition. One of the largest tributaries of the Yukon River, the Porrupine drains 46,000 square miles in Canada and Alaska. Beginning in the Ogilvie Mountains in Canada's Yukon Territory, the river flows northeast and then west about 300 miles to the U.S. border, then southwest more than 200 miles to its mouth at the Yukon River at Fort Yukon.
Starting at the U.S.-Canada border is a 40-mile segment with nearly continuous cliffs that rise between 250 and 500 feet above the river. Red Gate, a colorful, vertically walled canyon, marks the lower end of Upper Rampart Canyon. From here, for a distance of about 35 miles, the river flows through low hills and lowlands and the river gradient slows considerably. After passing the Coleen River, the Porrupine enters Lower Rampart Canyon-15 miles of limestone cliffs up to 60 feet high."