












































Harbor seals live and even thrive on the Copper River, following the migrating salmon over 30 miles from the ocean.

Warm days dry out the top layer of the silt flats, and when the afternoon winds whip up, the result is massive silt storms.

Chinook aren't the only species captured in the fish wheels. Here, a pair of sockeye salmon fall into the holding trough. A slit at the back of each trough allows these smaller fish to escape, while holding the larger king salmon.

Because of the constantly fluctuating level of the Copper River, the crew often has to adjust the shoreline anchors to keep the wheels operating in the sweet spot. Too far from the shore and the wheel will miss most of the fish. Too close and it will bash into boulders and damage the frame.

Jimmy Paley and Michael Orr prepare to load a Chinook into the handling trough, where a rubber basin and flowing water keep the fish secure and calm.

Electronic ID tags are inserted below the Chinook's dorsal fin. If the fish is recaptured upriver, its data will contribute to the success of the population monitoring program.

A stretch of warm weather causes a glacial stream to rise quickly, flooding a goose's nest and its eggs.

Safety is always the utmost concern for the crew while they work on the fish wheels. The temperature of the Copper River and its swiftness would make falling into the water almost certainly fatal.

Michael Orr and Max Best navigate the labyrinth of sand bars and treacherous waters of the Copper River during a silt storm.

Michael Orr sits where likely no one has ever sat, at the top of an uncharted mountain in the Chugach Range.