XPost: or.politics, pdx.general   
   From: chrishavel@hotmail.com   
      
   In article ,   
    gl4316@yahoo.com (gl4316@yahoo.com) wrote:   
      
   > In article <12pooectmrf69de@corp.supernews.com>, "Curt"    
   > wrote:   
   >   
   > > Hahaha I never saw it..it'd have to be kind of a miraculous waterfall..   
   > > isn't the Willamette something like twentyfive feet ASL in Portland? It's   
   > > like 30'MSL in Troutdale, ferpetesake.   
   >   
   >   
   > And after Troutdale it falls to essentially Sea Level at Willamette Falls   
   > in Oregon City.  Supposedly the area under the falls (where the falling   
   > water carves out a hole under the river) is some 100 feet below sea level.   
   >   
   > Tides impact the Columbia all the way up to the Beacon Rock / Bonneville   
   > Dam area.  If being impacted by the tides is considered "sea level" then   
   > Portland is pretty much at 0.   
      
   Well, kinda sorta. I know you know what you   
   mean, but for fear someone will read this and misunderstand: the water   
   level changes upriver as far as Bonneville because the river doesn't   
   discharge as fast when the gradient between the river and ocean is   
   shallow. Tide moves in, gradient between river and ocean is less, river   
   discharges at a correspondingly lower rate, and river essentially backs   
   up, causing water level changes beyond at elevations above mean sea   
   level (for those of you still reading, that's the average water level   
   between all high and low tides for a given location).   
      
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    * Origin: you cannot sedate... all the things you hate (1:229/2)