Several neighborhoods in Castle Rock have Metropolitan Districts, "Metro Districts" for short. These Metro Districts are separate governmental entities and are usually created by the developer/property owner at the time of initial development of the neighborhood or subdivision to allow for a special, localized mill levy to be imposed for certain development-related improvements (local streets, waterlines, landscaping, neighborhood amenities, etc.). These mill levies continue to support debt payments for initial improvement costs, some maintenance and new enhancements and other items set out in the approved service plans for the Metro Districts.
Metro Districts - and their mill levies - vary widely throughout Castle Rock as shown in this Town-prepared report (PDF).
Since the Metro Districts are separate entities, specific budget questions should be directed to your Metro District.