Colorado Dredging and highbanking Options

[WildernessAU]

Hello guys n gals,
I have afew questions about motorized prospecting in CO.
I know that in the Royal Gorge district one needs a permit to operate a dredge on the Arkansas River up to 4in nozzle. Does the permit area include all streams and feeder creeks that lie within the Royal Gorge area?
The permit states that highbanking can only be done at I think Woodys bar....is this true? Can we not highbank anywhere else.........or does it have to be listed on the permit as a valid claim area? hmm
What are the regulations and season for the rest of the state. I believe no permit is required for most of CO. Does this mean that I can dredge and highbank in any open area as long as I don't create a significant surface disturbance?
Thanks for any help. D

[EMac]

Are there any sources chronicling the history of suction dredging rules in Colorado? I'm curious how they were determined primarily; was it on data, emotion, an abundance of caution, someone stood to gain monetarily, they're monuments to some great mistake, or something else? I figure there's enough interest in this that the work has already been done; I'm not curious enough yet to piece it together myself.

I've heard casual use interpretations mean less than 1800ft³, but I'm not sure if that's the armchair lawyer interpretation, case law interpretation or if it's documented somewhere official.