Hi there! It looks like the only place in town offering the Johnson and Johnson vaccine at this time is River Family Health Center at 1010 S Rio Grande Ave, Montrose, CO. In Delta, there are four sites (Delta Health Family Medicine, Delta County Dept. of Public Health, Delta County Hospital and Delta Health Internal Medicine) that offer Johnson and Johnson.
However, the website I used21 to find this information only lists sites with vaccines provided by the state, and there are plenty of other local sites that aren't listed53. For those sites, you'd need to call ahead and see what their vaccine supply is like.