Water

Oregon:

Pat Welch's Water Level Page for Oregon
USGS Oregon Water Levels
USGS Oregon Water Watch
NOAA Northwest River Forecast Center
Oregon Surf Check

Washington:

Pat Welch's Water Level Page for Washington
USGS Washington river levels
USGS Washington WaterWatch

Idaho:

Pat Welch's Water Level Page for Idaho
USGS Idaho WaterWatch

Outside PNW:

American Whitewater River Info
Pat Welch's Water Level Page for All States
StormSurf
USGS National map of state hydrographs
Water Survey of Canada

Weather

Oregon:

NW Oregon/Portland area Weather Forecast
Oregon Climate Service
Intellicast - Precipitation Chart

Regional Weather Forecasts:

SW Oregon/Northern CA
NW Washington
NE Oregon/SE Washington
Eastern WA/Northern Idaho
Eastern OR/SW Idaho
W Montana/Central Idaho

General Weather Information:

National Forecast Maps
AccuWeather
Intellicast Daily Precipitation
National Weather Service (weather.gov)
The Weather Channel
Yahoo! Weather

Parking & Invasive Species Permit Info

OR Invasive Species Permit (boats 10' or longer)
ID Invasive Species Permit (except inflatables under 10')
Northwest Forest Pass
Washington Discover Pass

River Permit Info

4 Rivers Lottery: Selway, Hells Canyon-Snake, Wild Main Salmon, Middle Fork Salmon
Deschutes River
Grand Canyon Permit Lottery
Rogue National Wild & Scenic River

Current Issues

Common Waters of Oregon (River Rights)
Invasive Species

Informative Meetings

USGS Oregon Water Science Center Seminar Schedule

Local Organizations

BARK (Mt. Hood National Forest)
Columbia Riverkeeper
Cooper Spur Wild and Free Coalition
Friends of the Columbia Gorge
Klamath-Siskyou Wildlands Center
Oregon State Public Interest Research Group (OSPIRG)
Oregon Wild's water issues page
Stop Oregon Litter and Vandalism (SOLV)
Volcano Country Wild Rivers (WA)
Washington Public Interest Research Group (WASHPIRG)
WaterWatch - OregonWe Love Clean Rivers
Willamette Riverkeeper

National and International Organizations

American Canoe Association (ACA) 
American Rivers
American Whitewater
Friends of the River (CA)
Hike & Cycle - Save American Rivers - by State
International Rivers Network
National Organization for Rivers (NOR)
River Network
Western Rivers Conservancy