Saw this referred to at another site, as a new government web site.
Lots of great general water flow, tide, information on US fresh and saltwater. Topo maps etc. Check out the digital satellite images, awesome.
No wonder US air power kicked XXX on "The Taliban" however you would think they would have found UBL by now. IMHO, he is dead and we have not found him yet.
Some good stuff on this web site for all oudoor sports.