Muddy Run (Spruce Run tributary)
Muddy Run is a tributary of Spruce Run in Union County, Pennsylvania, in the United States. It is approximately long and flows through West Buffalo Township and Buffalo Township. The watershed of the stream has an area of . Part of the stream is designated as an impaired waterbody due to sedimentation and siltation from grazing-related agriculture. The majority of the watershed is forested, but there is also a considerable amount of agricultural land. A bridge has been constructed over the stream in the community of Mazeppa. Course. Muddy Run begins near the base of  Buffalo Mountain in West Buffalo Township. It flows east-southeast for several tenths of a mile before turning east-northeast and then east-southeast. Several tenths of a mile further downstream, the stream turns south-southeast for a few tenths of a mile before entering Buffalo Township and turning east for a few miles. It then turns southeast for several tenths of a mile before turning northeast. Several hundred feet further downstream, it reaches its confluence with Spruce Run. Muddy Run joins Spruce Run upstream of its mouth. Hydrology. A total of of streams in the watershed of Muddy Run  are designated as impaired waterbodies. The cause of the impairment is sedimentation/siltation and the source of the impairment is grazing-related agriculture. The total maximum daily load date is 2015. In addition to sediment, Muddy Run is also affected by "E. coli", nutrient pollution, and thermal radiation. In 2000, the load of sediment in Muddy Run was , while in 2008 it was . This equates to somewhere between . In the future, the load could be reduced by 50.30 percent to per year. In 2000, the nitrogen load in the stream was and in 2008, it was . This equates to somewhere  between . In the future, the nitrogen load could be reduced by 20.26 percent to per year. In 2000 and 2008, the phosphorus load was , respectively. This equates to more than . In the future, the phosphorus load could be reduced by 37.53 percent to per year. Of the of sediment in Muddy Run in 2000, came from row crops and came from streambank erosion. Another came from hay and pastures, while came from unpaved roads. A total of came from low-density urban development, while came from other sources. In 2000, the total load of nitrogen in Muddy Run from groundwater  was . The load from row crops was and the load from hay and pastures was . The nitrogen load from low-density urban development was , the load from unpaved roads was , and the load from septic systems was . A total of came from streambank erosion and came from other sources. In 2000, the total load of phosphorus in Muddy Run from row crops was and the load from groundwater was . The load from hay and pastures was , the load from low-density urban land was , came from unpaved roads, and came from septic systems. Other sources contributed . Geography and geology. The  elevation near the mouth of Muddy Run is above sea level. The elevation of the stream's source is between above sea level. A total of of streams in the watershed of Muddy Run are flanked by fences, though this could eventually increase to . Stabilization occurs on only of streams, though this could increase to in the future. Watershed and biology. The watershed of Muddy Run has an area of . The mouth of the stream is in the United States Geological Survey quadrangle of Lewisburg. However, the source is in the quadrangle of Mifflinburg. The watershed makes up 3 percent  of the watershed of Buffalo Creek. There are of streams in the watershed of Muddy Run, of which are in agricultural land. A total of 57 percent of the watershed of Muddy Run is on forested land. Another 35 percent is on agricultural land, while 3 percent is on impervious surfaces. The amount of land on impervious surfaces could be as high as 26 percent in the future. There is a field lane improvement project on of Muddy Run. A total of of agricultural land in the watershed is on slopes of more than 3 percent. There are of unpaved  roads in the stream's watershed. A total of of streams in the watershed of Muddy Run have riparian buffering, but this could increase to as much as in the future. History. Muddy Run was entered into the Geographic Names Information System on August 2, 1979. Its identifier in the Geographic Names Information System is 1182059. A concrete stringer/multi-beam or girder bridge carrying State Route 1001 was constructed over Muddy Run in Mazeppa in 1932. It is long.