At a wide pull out along Hwy 46. To qualify one must have found 500 geocaches listed as small. This cache can be included in that total. If one does not yet qualify, one can sign the log with a note then claim it as a find after one qualifies. I will verify qualification by checking your statistics on your profile page.
Small geocaches can be found in a number of places, in areas of high muggle activity or in the boonies. For a CO the small caches are easy to carry around and hide. The actual D/T rating is more like 1.5/1.5 but the ratingd for this challenge takes into account the number of small geocaches one needs to find, which takes an amount of time and also that one has to cover a lot of terrain.