USGS National Water Dashboard - Current water conditions.
Montana Boating Regulations and Registration - Boat registration, river permits, fees, boating laws, required equipment, and water closures.
Montana FWP - Fishing licenses, fishing access map, regulations, field guide, stocking data and lots more.
Paddling Montana - A Guide to the State's Best Paddling Routes
Paddling Idaho - A Guide to the State's Best Paddling Routes
Little Red Book of Fly Fishing