If you ride an ATV or other OHVs in the desert or other type of "playa lake", "mudflat" or "sandflat" your right to ride on public 
AND private land could be getting washed away in the name of The Clean Water Act.
According to a congressional bill, S 787, "intrastate lakes, rivers, streams (including intermittent streams), mudflats, sandflats, wetlands, sloughs, prairie potholes, wet meadows, playa lakes, or natural ponds;". will be moved under federal jurisdiction and subject to regulation.
That's pretty much all the water except subterranean (well) water. The wordage in the original Clean Waters Act of 1972 for this bill was purposefully changed:
by striking `navigable waters' each place it appears and inserting `waters of the United States'.
This bill goes to the Senate on October 15, 2009. From there it goes to the House, then to the POTUS to be signed into law. This is in addition to the federal take-over of the auto industry, the credit and banking industry, the bid to seize the health-care industry, and everything else our current administration is trying to control.