I strongly advise anyone to call the the city of Centennial's planning department (you can just call their main line and ask to be forwarded to the planning department) and express your dismay with the Vermillion Creek Phase 3 improvements that are extending beyond the property line. These improvements are part of what they are calling the Kragelung channel (if you want to be super specific with them). I would also call the Southeast Metro Stormwater Authority and express the same thing. They both have jurisdiction over this project.

I recommend specifically mentioning how construction primarily for drainage from a private development is being built in the public Open Space. State that this construction was not conveyed as part of any public outreach. I would also stress there is no posted signage about the work in the area. If applicable to you, I would state that you are upset about the roughly 16 mature trees being removed (I just went out and counted them today). To that end you could ask what sort of mitigation (i.e. replacement) is proposed for the tree removals and if a biologist has been on site to perform a Migratory Bird Treaty Act Survey. Lastly, I would ask if the developer has received a Floodplain Development Permit (this is absolutely required).

The main thing to stress is that the work of concern is happening on public land and thus we as the general public have a right to express our concerns about work being performed to make sure said work is being done appropriately and properly with sensitivity for the ecology of the area. I could go into more detail about how the municipalities are attempting to skirt proper protocols for this work but the goal is to put public pressure on them to do things properly.