Welcome to a forum that I am certain you will enjoy.
Re: Streamdance rods. MBWCC has done a thorough job of covering the various Loomis rod types, will get to the river.
Used to fish the Kern drainage in my younger days and am certain you
will enjoy the fishing as well as magnificent scenery.
A 9', 5wt rod will work just fine but before you buy one may I suggest you go to a dealer to see & cast them. While there I would recommend trying 5wt & 4wt rods in both 9' & 8.5' lengths. You might find one suits you
better than the rest. Since any combination is suitable for the area, pick the one that is most comfortable for you.
Have more comments but don't need to take up the space here. If interested, send a personal message, [PM] or contact me at my email, firstname.lastname@example.org
Good fishing up there, keep an eye peeled for rattlers.