New data shows who is living in and leaving the state of Colorado.
One clue seems to be the average incomes for people who moved from Denver, as reported in tax returns for 2014 and 2015.
It might be perfectly safe, but state environmental officials say it needs a thorough investigation.
Rocky Mountain Arsenal was used by the U.S. Army for decades to manufacture chemical weapons.
Here's three maps that show what Colorado's native situation looks like.
Denverite's Chart of the Week looks at native vs. transplant Coloradans.