Seventy One (also known as Garner Run) is a

tributary A tributary, or affluent, is a stream or river that flows into a larger stream or main stem (or parent) river or a lake. A tributary does not flow directly into a sea or ocean. Tributaries and the main stem river drain the surrounding drainage ...

of Elk Creek in

Elk County, Pennsylvania Elk County is a County (United States), county in the Commonwealth (U.S. state), Commonwealth of Pennsylvania. As of the 2020 United States census, the population was 30,990. Its county seat is Ridgway, Pennsylvania, Ridgway. The county was crea ...

, in the United States. It is approximately long and flows through St Marys. The watershed of the stream has an area of . The amounts of aluminum and iron in the stream are too small to be detectable. However, there are detectable amounts of manganese, acidity, and alkalinity in the stream. A portion of the stream's watershed is part of a greenway. A coal bed also is found near it.

Course

Seventy One begins at the top of a hill in St Marys. It flows southeast for a short distance before turning south-southwest for several tenths of a mile. It then receives an unnamed tributary from the

right Rights are law, legal, social, or ethics, ethical principles of Liberty, freedom or entitlement; that is, rights are the fundamental normative rules about what is allowed of people or owed to people according to some legal system, social convent ...

and then turns south-southwest for several tenths of a mile, entering a valley. The stream then receives another unnamed tributary and turns south for more than a mile. At the end of its valley, it crosses a

railroad Rail transport (also known as train transport) is a means of transport that transfers passengers and goods on wheeled vehicles running on rails, which are incorporated in tracks. In contrast to road transport, where the vehicles run on a pre ...

line and reaches its confluence with Elk Creek. Seventy One joins Elk Run upstream of its mouth.

Tributaries

Seventy One has no named tributaries. However, it does have two unnamed tributaries. The first is approximately long and joins the stream in its upper reaches. The second is also approximately long.

Hydrology

The concentrations and daily loads of

aluminum Aluminium (aluminum in American and Canadian English) is a chemical element with the symbol Al and atomic number 13. Aluminium has a density lower than those of other common metals, at approximately one third that of steel. It has ...

and

iron Iron () is a chemical element with symbol Fe (from la, ferrum) and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is, by mass, the most common element on Earth, right in f ...

in the waters of Seventy One at its mouth are too low to be detectable. However, the daily load of

manganese Manganese is a chemical element with the symbol Mn and atomic number 25. It is a hard, brittle, silvery metal, often found in minerals in combination with iron. Manganese is a transition metal with a multifaceted array of industrial alloy use ...

is per day and the concentration is 0.01 milligrams per liter. It requires no reduction to meet the stream's total maximum daily load requirements. The daily load of acidity in the stream is per day and the acidity concentration is 12.43 milligrams per liter. It requires a reduction of 67 percent to meet the stream's total maximum daily load requirements. The pH of the stream is between 5.5 and 6.1. The daily load of alkalinity is . The average

discharge Discharge may refer to Expel or let go * Discharge, the act of firing a gun * Discharge, or termination of employment, the end of an employee's duration with an employer * Military discharge, the release of a member of the armed forces from serv ...

of Seventy One at its mouth is 1.26 million gallons per day.

Geography and geology

The elevation near the

mouth In animal anatomy, the mouth, also known as the oral cavity, or in Latin cavum oris, is the opening through which many animals take in food and issue vocal sounds. It is also the cavity lying at the upper end of the alimentary canal, bounded on ...

of Seventy One is above

sea level Mean sea level (MSL, often shortened to sea level) is an average surface level of one or more among Earth's coastal bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datuma standardised g ...

. The elevation near the stream's source is between above sea level. A

coal bed Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. Coal is formed when dea ...

known as the Alton Upper Bed occurs in the vicinity of Seventy One, on the stream's western side.

Watershed

The watershed of Seventy One has an area of . The mouth of the stream is in the

United States Geological Survey The United States Geological Survey (USGS), formerly simply known as the Geological Survey, is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, ...

quadrangle of Ridgway. However, its source is in the quadrangle of St Marys. A portion of the watershed of Seventy One is in a greenway known as the Elk Creek Natural System Greenway Corridor.

History

Seventy One was entered into the

Geographic Names Information System The Geographic Names Information System (GNIS) is a database of name and locative information about more than two million physical and cultural features throughout the United States and its territories, Antarctica, and the associated states of ...

on August 2, 1979. Its identifier in the Geographic Names Information System is 1199966.

References

{{authority control Rivers of Elk County, Pennsylvania Tributaries of the Allegheny River Rivers of Pennsylvania