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This should clear things up a little; pp.17-need risers, fig. 27 max. stringer span 7'; 5"min, throat, 16'6" max. closed stringer span; pp.2- table 1; fig.31- top stringer hanger required; fig.34- post footing depth to reduce stringer span; ect. etc.
http://www.awc.org/Publications/DCA/DCA6/DCA6-09.pdf

And, always check locally for amendments to codes.

Gary
Good catch Gary…….no southern pine in Oregon so the 13’3” would apply for a free span. A mid span support would negate that though. For a long run like that I will use 3 or 4X PT stock which I know is readily available in Oregon but is a special order pita where I’m living at now.
 
I use 2x3 Clear Cedar for exterior grab rails with a ¾” round over on all edges. Mounted with aluminum brackets (I wish I could get them in SS) just like an interior railing.

I’ll actually rip the 2x3 to 2 ¼” wide because I think the 2 ½” wide is just a little much for a grab rail where 2 ¼” feels perfect to me.
 
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