Missoula's Whitewater Central (boaters' website)
NPS—Flathead Wild and Scenic River
NPS—Glacier Nat'l Park Maps and Brochures (PDFs)
Waterton Lakes National Park of Canada
river-management.org permits for western rivers
USGS—Montana Current Streamflow text
USGS—MT current streamflow map
NOAA—Northwest River Forecast Center
Trailhead Montana Missoula outdoor store