Raystown Dam tailrace ?

Jeb - they used to stock the area heavily.  Not sure about now.   We lazy float it now.    We get in right where the first island starts to split which is right below the parking lot to access the tailrace.  You can usually wade across there.  You should be okay in May just be careful.  If the visibility is bad it'd be wise to forget it.  It's got to be pumping water to get that deep green color.  The parking side of the island has some consistent flow and holds trout till the water gets too warm.  You never know what you'll catch there but I wouldn't expect trout any bigger than stockers.  No doubt some huge fish there but you'd have to spend some considerable time or get lucky.
 
The stripers up in the tailrace will start cruising from the outflow to about the island once the sun goes down.  They'll do it till sun up.. if you're interested in that.