For Colorado.You mean from the north to the south,right?
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It means to travel in a north-south direction for Colorado.
It is an advertisement to attract people.This is the whole context .Please tell us where you saw this sentence and give us some context.
You should know to do this by know.
I've just returned from a couple of weeks in Colorado and the American West. We made a brief stop at the Arapaho National Wildlife Refuge Visitor Center, a parking area with a walkway overlooking the prairie. Interpretive plaques on the stonework explain the geology, fauna and flora, and history of the area. One of them said that the stream winding through the prairie below us drained into the North Platte River, one of the few rivers in North America that runs from south to north. Looking at the images in the Wikipedia article, I see that on the first half or so of the Colorado portion of the South Platte, "downriver" is also north. Colorado rivers mostly flow south-north, west-east, or east-west.It means to travel in a north-south direction for Colorado.

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