Tim Jim,
Check out this site —> http://www.mvp-wc.usace.army.mil/projects/Lock3.shtml
Just change the Lock # to whichever lock/dam you want to see the measurements at. I like the text table view myself.
In order to convert the stage to match the other site you posted, take the elevation and subtract the normal pool level (I think this is around 683.2). For example, to find out what the stage was on 6/13, I took the elevation of 688.5 and subtracted 683.2 to get a stage of 5.45 which you can compare to your chart.
Hopefully a fellow IDO river rat will correct me if I’m wrong but this has worked for me in the past.
Good luck!