Alaska · Lake and Peninsula Borough

Alagnak River

★ Wild & Scenic🏞 National Park
Lake and Peninsula Borough · 67 mi · Class II–III
Optimal: 800–4000 CFS · USGS #15300500
2,200 avg
9,860CFS
11.01 ft gauge height
Above Optimal
↓Falling slowly (-30 cfs/hr)(-140 in 3h)
⚡Flow data is live from USGS·Rapid classifications and CFS ranges need community verification·Know this river?
Avg flow: 2,200 cfsHist. median: 1,980 cfsUSGS #15300500
National Wild & Scenic River (1980) · Katmai National Park and Preserve · Bristol Bay Watershed

Alaska’s most famous Wild & Scenic float-trip river — the Alagnak (‘Branch River’) drains Kukaklek Lake in Katmai National Park and flows 67 miles through tundra and braided gravel to Bristol Bay. All five species of Pacific salmon spawn in the Alagnak, plus trophy rainbow trout, char, and grayling. The Class II–III braided water makes it one of the best multi-day float trips in Alaska, with fly-out access from King Salmon and lodge-supported floats lasting 5–7 days from Kukaklek Lake to the Kvichak River confluence.

Outfitters
Alagnak Lodge
Multi-day float trips and fly-out fishing
10-Year Flow Patterns
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Data Quality

River conditions are community-verified. CFS ranges, difficulty ratings, and access points may not reflect every flow level or seasonal change. Always check current conditions, scout unfamiliar rapids, and paddle within your skill level.

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