They flow in the Pacific Ocean.
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Colorado River
The Rocky Mountains are found in the west of the United States and Canada.
If you mean the Columbia River along the Oregon/Washington border, The river rises in the Rocky Mountains in British Columbia, Canada, flows northwest and then south into the U.S. state of Washington, then turns west to form most of the border between Washington and the state of Oregon before emptying into the Pacific Ocean.
A map of the Rocky Mountains would have a small contour interval because of the multiple peaks and ridges and the constant increase of elevation.
A map of the united states physical features. Or one of North America