The same question arises when a course of criminal conduct begins in one state and continues or ends in another, and the answer is that multiple states (and the United States) may have subject matter jurisdiction (authority to deal with the case). One key consideration is whether any part of the criminal conduct occurred in the governed territory. Here is
Colorado Revised Statutes Section 18-1-201, which speaks to this issue at the state level.
Within the state, similar factors apply among judicial districts. Within a judicial district, a similar issue of "venue" (which forum) may arise, and again, more than one venue may be proper.
Jurisdiction and venue are certainly appropriate in Alamosa County. I suppose Morphew could move to challenge it, but he'd have to give the judge a compelling reason to transfer the case.