Cabin Run is a tributary of West Branch Briar Creek in Columbia County, Pennsylvania, in the United States. It is approximately long and flows through North Centre Township. The watershed of the stream has an area of . The waters of the stream are slightly acidic. Its watershed lies over shale and siltstone. Several early attempts at settlement on Cabin Run occurred in 1777 and 1778. Course Cabin Run begins in a valley on Summer Hill in North Centre Township. It flows southeast for a short distance before turning south and flowing parallel to Cabin Run Road for several tenths of a mile. Upon leaving the valley, the stream crosses Fowlersville Road and turns southeast for a short distance before turning south again. After another few tenths of a mile, it reaches its confluence with West Branch Briar Creek. Cabin Run reaches its confluence with West Branch Briar Creek upstream of its mouth. Hydrology The discharge of Cabin Run ranges from 0.17 to 15.7 cubic feet per second. The median discharge is 0.53 cubic feet per second. The water temperature of the stream ranges from to . The pH of Cabin Run ranges from 7.28 to 7.9, with a median of 7.73. The concentration of total dissolved solids in the stream ranges from 42 to 106 parts per million. The median concentration of total dissolved solids is 59 parts per million. The stream sometimes has high concentrations of lead and nitrates. In a visual assessment by the Briar Creek Association for Watershed Solutions, Cabin Run was given a score of 5.6 on a scale of 1 to 10. The stream scored best on nutrient enhancement and fish barriers and it scored worst on streambank stability and riparian buffering. Of ten sites in the Briar Creek watershed, this location has a priority rank of 5. Geography and geology The elevation near the mouth of Cabin Run is above sea level. The elevation of the stream at its source is between and . A hill known as Summer Hill is in the watershed of Cabin Run. The mouth of Cabin Run lies over calcareous shale. The rest of the lower part of the watershed is on shale. The upper reaches of the watershed lie over siltstone. The soil in an area in the lower reaches of the stream is of the Zipp Series. This is a poorly drained silt loam. The lower