:Chimneystack Run

Chimneystack Run begins in a deep valley between Central Mountain and Red Rock Mountain in northern Sugarloaf Township, slightly more than {{convert|1000|ft|m}} south of the Columbia County/Sullivan County line. It flows east-southeast for a few tenths of a mile and its valley deepens. The stream then turns south for a similar distance before turning east-southeast. Its valley becomes significantly shallower at this point. After a few tenths of a mile, it leaves its valley altogether, turning south-southeast and flowing down Central Mountain. After several tenths of a mile, the stream receives an unnamed tributary from the left. A short distance later, it reaches its confluence with Coles Creek.

Chimneystack Run joins Coles Creek {{convert|4.70|mi|km}} upstream of its mouth.{{Citation|url = http://www.lycoming.edu/cwi/pdfs/paGazetterOfStreams.pdf|title = Pennsylvania Gazetteer of Streams|date = November 2, 2001|accessdate = December 23, 2014}}

The elevation near the mouth of Chimneystack Run is {{convert|1038|ft|m}} above sea level.{{Citation|author = Geographic Names Information System|url = http://gnis.usgs.gov/apex/f?p=136:3:0::NO::P3_FID,P3_TITLE:1171790,Chimneystack%20Run|archive-url = https://archive.today/20141223223007/http://gnis.usgs.gov/apex/f?p=136:3:0::NO::P3_FID,P3_TITLE:1171790,Chimneystack+Run|url-status = dead|archive-date = December 23, 2014|title = Feature Detail Report for: Chimneystack Run|accessdate = December 23, 2014}} The elevation of the stream's source is between {{convert|2100|and|2120|ft|m}} above sea level.

The headwaters of Chimneystack Run are on a saddle between Central Mountain and the westernmost portion of Red Rock Mountain. During a period of glaciation an ice lobe at the headwaters of Chimneystack Run nearly split the western part of a nunatak on Central Mountain and Red Rock Mountain. There are abandoned glacial meltwater channels near the stream's headwaters. Some bedrock ledge outcrops are present in the upper reaches of the watershed.{{Citation|author=Duane D. Braun |url=http://www.dcnr.state.pa.us/topogeo/openfile/redrock.pdf |title=Surficial Geology of the Red Rock 7.5-Minute Quadrangle Luzerne, Sullivan, and Columbia Counties, Pennsylvania |pages=12, 18 |year=2007 |accessdate=December 23, 2014 |url-status=dead |archiveurl=https://web.archive.org/web/20120924083144/http://www.dcnr.state.pa.us/topogeo/openfile/redrock.pdf |archivedate=September 24, 2012 }}

For most of its lower reaches, Chimneystack Run flows over a glacial till known as the Wisconsinan Bouldery Till. It is also present near the headwaters of the stream. Boulder colluvium and a glacial till known as the Wisconsinan Till occur along the stream's middle reaches. Most of the till in the vicinity of the creek is expected to be more than {{convert|6|ft|m}} thick. The surface in these areas contains cobbles and boulders made of quartz, sandstone, and conglomerate. In the stream's upper reaches, the bedrock contains red and gray sandstone and shale. The bedrock underlies red-brown to yellow-brown diamict that contains clayey silt and sandy silt.

The watershed of Chimneystack Run has an area of {{convert|1.07|sqmi|km2}}. The stream is entirely within the United States Geological Survey quadrangle of Red Rock. It is located in the northeastern part of Sugarloaf Township.

Chimneystack Run was entered into the Geographic Names Information System on August 2, 1979. Its identifier in the Geographic Names Information System is 1171790.

Chimneystack Run is named after Chimneystack Rock, a sandstone rock on Central Mountain. The rock itself is named for its resemblance to a chimneystack.

Wild trout naturally reproduce in Chimneystack Run.{{Citation|author = Columbia County Conservation District|url = http://www.columbiaccd.org/natural_trout_reproduction_july_2013.pdf|title = Pennsylvania Wild Trout Waters (Natural Reproduction) ‐ July 2013 Columbia County|date = July 2013|accessdate = December 23, 2014|url-status = dead|archiveurl = https://web.archive.org/web/20140910195305/http://www.columbiaccd.org/natural_trout_reproduction_july_2013.pdf|archivedate = September 10, 2014}} The 1977 Columbia County Natural Resource Inventory states that the stream is an "excellent" stream for trout fishing.{{Citation|author = Columbia County Planning Commission|url = https://books.google.com/books?id=bDcNAQAAMAAJ&q=%22Chimneystack+Run%22|title = Columbia County Natural Resource Inventory: June, 1977|page = 20|date = June 1977}}

• List of tributaries of Fishing Creek (North Branch Susquehanna River)

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Category:Rivers of Columbia County, Pennsylvania

Category:Tributaries of Fishing Creek (North Branch Susquehanna River)

Category:Rivers of Pennsylvania