Exploring the Colorado River within Grand Canyon National Park http://www.nps.gov/grca/index.htm was a magnificent experience. During September of 1983 - during a trip organized by the Nantahala Outdoor Center http://www.noc.com/ - Bob Obst canoed through most of the Grand Canyon - with the exception of Crystal Rapids - with his tandem, decked canoe partner Dr. Colleen E. Hayes. Bob's father - Robert J. Obst - was on a raft. During September 1983 water flow through the "Grand Canyon" ranged 25-30,000 CFS during our entire 3 week adventure. NOTE: During the Summer of 1983, water flow through the Grand Canyon was at record highs - ranging 25,000 to 92,600 CFS with the 92,600 CFS peak occurring on 6/29/1983. Some rapids - such as Crystal Rapids and Lava Falls - were rated class 4+ on a six point (international) scale. Although not as difficult as other rivers Bob has paddled, the Grand Canyon - with its powerful rapids, unending spectacular vistas, amazing side-canyon hikes, and colorful inner gorges - was one of the most memorable. For helpful references, the Grand Canyon Field Institute (GCFI) publishes an interactive map of the Grand Canyon at http://www.grandcanyon.org/fieldinstitute/aboutus.asp, there is a 3-D Geologic Tour of the Grand Canyon available at http://www.durangobill.com/GrandCanyonTour.html, the Wikipedia lists Colorado River rapids and features at http://en.wikipedia.org/wiki/List_of_Colorado_River_rapids_and_features and the USGS provides online water flows through the Grand Canyon at http://waterdata.usgs.gov/usa/nwis/uv?site_no=09380000 . All pictures in this gallery are by copyright © Colleen E. Hayes & Robert Arthur Obst (r.obst@att.net, 608-658-6116 http://robertarthurobstphotos.com/ ). Please NOTE that this web page also gives one an option for a fee to order photos printed professionally on paper and/or on merchandise such as mugs, T-Shirts, magnets, and other great stuff. (To do this click “Buy” above the selected photo; these make great gifts : ). " Finally, PLEASE rank these photos and videos; to do that just go to a photo, click "Add Comment" at the screen bottom, rank the photo (optional), and input your "Comments." Or - if you don't have time to enter comments - simply roll your cursor over a photo and select "Thumbs-Up" : ) or "Thumbs-Down" ( : ...I will use your feedback to improve these photos. All river mileages described below are from Lees Ferry, Arizona. Please enjoy these pictures of exploring the Colorado River by paddlecraft within "Grand Canyon National Park."