XPost: or.politics, pdx.general   
   From: nospam@spam.com   
      
   "Chris Havel"  wrote in message   
   news:chrishavel-9B1020.20400103012007@comcast.dca.giganews.com...   
      
   >> 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). mode>   
      
   In the summer time, the Columbia river will reverse on an incoming tide as   
   far as vancouver.  I took a look at the guage web page, and they no longer   
   show flow rate for that gauge.  Apparently it no longer records flow rate,   
   so the data has been removed.   
      
   It is running both ways at Beaver even with the current high flow rate:   
   http://waterdata.usgs.gov/or/nwis/uv/?site_no=14246900   
      
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