Long Hollow begins on Catawissa Mountain in Roaring Creek Township.

It continues east and after a sort distance, the stream receives an unnamed tributary.

[2] Long Hollow joins Catawissa Creek 13.82 miles (22.24 km) upstream of its mouth.

[5] At noon on June 26, 1997, the air temperature in the vicinity of Long Hollow was 25 °C (77 °F).

[5] Eight percent of the length of Long Hollow is within 100 metres (330 ft) of a road.

[5] In the early 1900s, the Philadelphia and Reading Railway requested permission to build a concrete arch culvert across Long Hollow.

[7] A bridge over Long Hollow was swept away during the 1904 Susquehanna River Floods.

[8] Long Hollow is considered by the Pennsylvania Department of Environmental Protection to be a coldwater fishery.

[4] However, a 1997 report suggested upgrading the stream's designation to high-quality coldwater fishery.

The biomass of wild brook trout in the stream is 23.67 kilograms (52.2 lb) per hectare.