West Branch Briar Creek is a tributary of Briar Creek, in Columbia County, Pennsylvania, in the United States. It is approximately 6.53 miles (10.51 km) long. The creek flows through North Centre Township and Briar Creek Township and has two tributaries: Cabin Run and Fester Hollow. Its watershed has an area of 12.06 square miles.
The discharge of West Branch Briar Creek ranges from 0.67 to 33.1 cubic meters per second. Rocks found in the watershed include shale, sandstone, siltstone, mudstone, and limestone.
The Fowlersville Covered Bridge used to cross West Branch Briar Creek.
West Branch Briar Creek begins in western North Centre Township, near the Hidlay Church. The creek flows east-northeast on fairly level ground. It receives the tributary Cabin Run, which flows south from Summer Hill, after some distance, and continues heading east-northeast. A number of miles later, the creek picks up the tributary Fester Hollow. It then turns northeast and passes near the community of Fowlersville. It then begins flowing parallel to Pennsylvania Route 93 and exits North Centre Township. Upon exiting North Centre Township, the creek enters Briar Creek Township. Shortly afterwards, it reaches its confluence with Briar Creek.
There are two named tributaries to West Branch Briar Creek: Cabin Run and Fester Hollow. Fester Hollow is several times longer than Cabin Run and its watershed is far larger. Cabin Run is 1.22 miles (1.96 km) long and Fester Hollow is 5.66 miles (9.11 km) long.
The discharge of West Branch Briar Creek ranges from 0.67 to 31.1 cubic meters per second. The median discharge is 3.2 cubic meters per second. The water temperature of the creek ranges from 35.6 °F (2.0 °C) to 71.6 °F (22.0 °C), with a median of 57.38 °F (14.10 °C). According to the Briar Creek Association for Watershed Solutions, the water temperature is often higher than they consider acceptable.