Portland is set to begin the long-awaited demolition of the Centennial Mills water tower on Monday, following a major fire that has posed significant safety risks to the surrounding Pearl District. Residents have been warned to expect sirens, mass public safety texts, and a controlled detonation as part of the demolition process. Concerns have been raised among neighbors regarding potential exposure to asbestos and toxic chemicals, especially with Union Pacific trains reportedly running hazardous materials near the collapse zone. As the city prepares for this complex operation, safety measures have been communicated to the public to mitigate risks associated with the demolition. Mayor Keith Wilson has declared a state of emergency due to the threats posed by the deteriorating structure.