Biscuit Basin closed for the remainder of summer due to hydrothermal explosion Alert 1, Severity closure, Biscuit Basin closed for the remainder of summer due to hydrothermal explosion The parking lot and boardwalks at Biscuit Basin, located north of Old Faithful, are closed for the remainder of the summer due to a hydrothermal explosion that occurred July 23. The Grand Loop Road remains open to vehicles. Biscuit Basin hydrothermal explosion: Boardwalk condition post-explosion. NPS / Jacob W. Frank Date of release: July 24, 2024USGS Volcano Notice - DOI-USGS-YVO-2024-07-24T21:27:48+00:00YELLOWSTONE (VNUM #325010) 44°25'48" N 110°40'12" W, Summit Elevation 9203 ft (2805 m)...