SYLVAN, Mont. - ***UPDATE***
Yellowstone National Park employees have utilized the howitzer to conduct avalanche hazard mitigation operations and have groomed the East Entrance road for motorized oversnow travel.
Sylvan Pass is now OPEN to all oversnow travel.
Park employees continue to monitor weather and snow conditions and conduct avalanche forecasting operations.
Sylvan Pass is temporarily CLOSED to ALL oversnow travel due to avalanche danger.
ALL travel by snowmobile, snowcoach, skis and snowshoes over Sylvan Pass is PROHIBITED.
Only those National Park Service employees specifically assigned to and involved in avalanche forecasting and avalanche hazard mitigation operations may travel in this area during this time.
Sylvan Pass will remain temporarily CLOSED until forecast conditions permit Yellowstone National Park employees to conduct avalanche hazard mitigation operations and groom the route for motorized oversnow travel.
It is not possible to estimate the duration of this temporary closure, since it is entirely dependent upon changing weather conditions.
You will be notified by e-mail when this work is completed and Sylvan Pass re-opens to oversnow travel.