I went via Jim Creek the weekend before last, I made it to within about a half mile of the moraine, but the trail had totally fallen apart and it would have taken me too long to get to the moraine or glacier, vs. coming back at a reasonable time. The trails have only been getting better though so it's likely not a problem anymore, unless wind drifts snow or some similar event. It's fairly dynamic, but more and more people are making the trip every day from both trailhead areas. Lots of information on the Anchorage fatbike page about the correct trailheads/where to park.