A river mile is a measure of distance in miles along a river from its mouth. River mile numbers begin at zero and increase further upstream. The corresponding metric unit using kilometers is the river kilometer. They are analogous to vehicle roadway mile markers, except that river miles are rarely marked on the physical river; instead they are marked on navigation charts, and topographic maps. Riverfront properties are sometimes partially legally described by their river mile.
The river mile is not the same as the length of the river, rather it is a means of locating any feature along the river relative to its distance from the mouth, when measured along the course (or navigable channel) of the river.[1]
River mile zero may not be exactly at the mouth. For example, the Willamette River (which discharges into the Columbia River) has its river mile zero at the edge of the navigable channel in the Columbia, some 900 feet (270 m) beyond the mouth.[2] Also, the river mile zero for the Lower Mississippi River is located at Head of Passes, where the main stem of the Mississippi splits into three major branches before flowing into the Gulf of Mexico. Mileages are indicated as AHP (Above Head of Passes) or BHP (Below Head of Passes).[3]
Uses in the United Statesedit
River miles are used in a variety of ways. The Commonwealth of Pennsylvania, in its 2001 Pennsylvania Gazetteer of Streams, lists every named stream and every unnamed stream in a named geographic feature in the state, and gives the drainage basin area, mouth coordinates, and river mile, specifically the distance from the mouth of the tributary to the mouth of its parent stream.[1] Some islands are named for their river mile distance, for example the Allegheny River in Pennsylvania has Six Mile Island, Nine Mile Island, Twelve Mile Island, and Fourteen Mile Island.[4][5] (The last two islands form Allegheny Islands State Park, although Fourteen Mile Island was split into two parts by a dam).[6][7]
The state of Ohio uses the "River Mile System of Ohio", which is "a method to reference locations on streams and rivers of Ohio".[8] This work began by hand measurements on paper maps between 1972 and 1975 and has since been converted to a computer-based electronic version, which now covers the state in 787 river mile maps. Locations of facilities such as wastewater treatment plants and water quality measurement sites are referenced via river miles. Ohio uses one of two systems. The simplest is just the name of the river and the location in river miles. In cases where there is ambiguity, for example when more than one stream has the same name, it uses a series of river mile strings referring to the distance to the ocean along either the Ohio River (and Mississippi River) or through Lake Erie (and the Saint Lawrence Seaway).[8]
Another example of a River Mile System is utilized by the U.S. Bureau of Reclamation, in New Mexico, on the Rio Grande. The river miles in Central New Mexico are measured from Caballo Dam upstream to near Embudo, New Mexico. For example, a river mile sign in the Albuquerque Bosque (part of Albuquerque's Open Space Park) is River Mile 184, approximately 184 miles above Caballo Dam. As mentioned earlier in this system the further you go up stream the higher the river mile number. This system is measured in 10ths of a mile.
River Mile 184 sign in the Bosque along the Rio Grande in the Albuquerque Open Space
^Sole, Robert L.; et al. (November 1999). "Lower Mississippi River Ports and Waterways Safety System (PAWSS) RF Coverage Test Results" (PDF). Retrieved 2010-10-08.
^. University of Pittsburgh, Department of Geology. Archived from the original on 2007-07-15. Retrieved 2008-04-11.
^ ab(PDF) (Map). 1' - 1500". U.S. Army Corps of Engineers, Pittsburgh District. January 2004. Archived from the original (PDF) on 2007-06-11. Retrieved 2007-08-25.
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A river mile is a measure of distance in miles along a river from its mouth River mile numbers begin at zero and increase further upstream The corresponding metric unit using kilometers is the river kilometer They are analogous to vehicle roadway mile markers except that river miles are rarely marked on the physical river instead they are marked on navigation charts and topographic maps Riverfront properties are sometimes partially legally described by their river mile Part of Fourteen Mile Island in the Allegheny River the island is named for its distance from the river s mouth in river miles The river mile is not the same as the length of the river rather it is a means of locating any feature along the river relative to its distance from the mouth when measured along the course or navigable channel of the river 1 River mile zero may not be exactly at the mouth For example the Willamette River which discharges into the Columbia River has its river mile zero at the edge of the navigable channel in the Columbia some 900 feet 270 m beyond the mouth 2 Also the river mile zero for the Lower Mississippi River is located at Head of Passes where the main stem of the Mississippi splits into three major branches before flowing into the Gulf of Mexico Mileages are indicated as AHP Above Head of Passes or BHP Below Head of Passes 3 Uses in the United States editRiver miles are used in a variety of ways The Commonwealth of Pennsylvania in its 2001 Pennsylvania Gazetteer of Streams lists every named stream and every unnamed stream in a named geographic feature in the state and gives the drainage basin area mouth coordinates and river mile specifically the distance from the mouth of the tributary to the mouth of its parent stream 1 Some islands are named for their river mile distance for example the Allegheny River in Pennsylvania has Six Mile Island Nine Mile Island Twelve Mile Island and Fourteen Mile Island 4 5 The last two islands form Allegheny Islands State Park although Fourteen Mile Island was split into two parts by a dam 6 7 The state of Ohio uses the River Mile System of Ohio which is a method to reference locations on streams and rivers of Ohio 8 This work began by hand measurements on paper maps between 1972 and 1975 and has since been converted to a computer based electronic version which now covers the state in 787 river mile maps Locations of facilities such as wastewater treatment plants and water quality measurement sites are referenced via river miles Ohio uses one of two systems The simplest is just the name of the river and the location in river miles In cases where there is ambiguity for example when more than one stream has the same name it uses a series of river mile strings referring to the distance to the ocean along either the Ohio River and Mississippi River or through Lake Erie and the Saint Lawrence Seaway 8 Another example of a River Mile System is utilized by the U S Bureau of Reclamation in New Mexico on the Rio Grande The river miles in Central New Mexico are measured from Caballo Dam upstream to near Embudo New Mexico For example a river mile sign in the Albuquerque Bosque part of Albuquerque s Open Space Park is River Mile 184 approximately 184 miles above Caballo Dam As mentioned earlier in this system the further you go up stream the higher the river mile number This system is measured in 10ths of a mile nbsp River Mile 184 sign in the Bosque along the Rio Grande in the Albuquerque Open SpaceThe U S Army Corps of Engineers uses river miles for its navigation maps 5 References edit a b Pennsylvania Gazetteer of Streams PDF Pennsylvania Department of Environmental Protection 2001 Archived from the original PDF on 2008 06 25 Retrieved 2008 04 11 See this map of the Willamette s mouth Sole Robert L et al November 1999 Lower Mississippi River Ports and Waterways Safety System PAWSS RF Coverage Test Results PDF Retrieved 2010 10 08 Site PGHBW 4 3 A View of the Point from Grandview Avenue Pittsburgh PA University of Pittsburgh Department of Geology Archived from the original on 2007 07 15 Retrieved 2008 04 11 a b Allegheny River Chart No 5 Pennsylvania Allegheny County Twelve Mile Island Fourteen Mile Island C W Bill Young Lock amp Dam Pool PDF Map 1 1500 U S Army Corps of Engineers Pittsburgh District January 2004 Archived from the original PDF on 2007 06 11 Retrieved 2007 08 25 Allegheny Islands State Park Pennsylvania Department of Conservation and Natural Resources Archived from the original on March 2 2004 Retrieved 2008 04 11 Pennsylvania Environmental Council Three Rivers Conservation Plan Chapter One Project Area Characteristics PDF Pennsylvania Department of Conservation and Natural Resources Archived from the original PDF on March 28 2006 Retrieved 2008 04 11 a b River Mile System of Ohio Ohio Environmental Protection Agency Division of Surface Water Archived from the original on 2008 06 08 Retrieved 2008 04 11 External links editWaterway Mile Marker Database Delaware River Mileage System Retrieved from https en wikipedia org w index php title River mile amp oldid 1138898107, wikipedia, wiki, book, books, library,
