In 1989 the park areas was heavily affected by the Exxon Valdez Oil Spill which devastated the Alaska Peninsula. Puale Bay was the most heavily oiled bay outside of Prince William Sound.[4]
In an effort to determine species presence, distribution, habitat use, and migratory patterns, extensive land bird studies were conducted from 1995 through 1998 at various locations around Becharof Lake.[4] Biologists continued the monitoring work in the park 2001 through 2003 using the same methods, paying notable attention to seabird activity, along with caribou and Alaskan moose populations.[4] The refuge is affiliated with the Alaska Fish and Wildlife Cooperative Research Unit at the University of Alaska Fairbanks to conduct research into the drainage basin east of the Ugashik Lakes on the Alaska Peninsula to monitor moose activity.[4]
Landscape and wildlife
The Becharof National Wildlife Refuge covers an area of 1,200,000 acres (4,900 km2).[3] It lies on a mountainous coastline containing the Ugashik-Peulik volcano and steep cliffs and the park contains a range of geographical features from mountains, broad valleys and fjords, to tundra and glacially formed lakes.[3] Within the park lies the extensive Becharof Lake which at 300,000 acres (1,200 km2), 35 miles (56 km) long, 15 miles (24 km) wide and 600 feet (180 m) deep at deepest, it is second largest lake in Alaska and the largest in the entire National Wildlife Refuge System.[3] The lake is fed by a number of rivers and streams, and contains some of the largest salmon populations in the world. The lake has the world's second largest run of sockeye salmon and estimates reveal that Becharof Lake and its tributaries provide the Bristol Bay fishery alone with six million adult salmon per year.[3] Wildlife is abundant in the park and the high levels of salmon are enough to feed the largest concentrations of brown bears in Alaska. Wolf packs, two species of fox, wolverine, river otter, beaver, caribou, seals, sea lions, sea otters and whales as well as various seabirds such as eagles found along the shore.[3][5]