Green River
King Co. · 65 mi · Class I–III
1,480CFS/ 58.85 ft
Optimal
Stable
Optimal: 500–3000 CFS · USGS #12113000
Flow data is live from USGS·Rapid classifications and CFS ranges need community verification·Know this river?
65 mi
Length
Class I–III
Difficulty
500–3000 cfs
Optimal
1,600 cfs
Avg Flow
1,400 cfs
Hist. Median
#12113000
USGS Gauge
Green River Gorge Conservation Area · King County

The Green River Gorge is the closest whitewater to Seattle — a surprising Class II–III canyon cut through sandstone just 45 minutes from downtown. The gorge section features continuous rapids, 300-foot canyon walls, and old-growth forest in a corridor that feels impossibly remote for its proximity to the metro area. Above and below the gorge, the Green offers gentle Class I floating.

Trip sections
Upper Green — Headworks to Kanaskat, Class I–II, mountain run
Green River Gorge — Kanaskat to Flaming Geyser, Class II–III, best section
Lower Green — Flaming Geyser to Auburn, Class I, urban float
Outfitters
Northwest Whitewater Association
Green River Gorge group trips and instruction
72-Hour Flow Forecast
NOAA NWPS
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10-Year Flow Patterns
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Your Optimal Range
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Data Quality

River conditions are community-verified. CFS ranges, difficulty ratings, and trip sections may not reflect every flow level or seasonal change. Always check current conditions, scout unfamiliar rapids, and paddle within your skill level. If you spot an error, use the Improve This River button at the top of the page — your local knowledge is what makes this atlas accurate.