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Minar also cautions that there is some missing data as well as some nuances of the data and software that causes some blue rectangles and variable density, particularly north of Texas and west of the Mississippi.
Each year since 1986 the American Rivers organization has surveyed the nation's waterways to determine which are most distressed. One of us [Gleick] grew up along the Hudson River on the East Coast, and encountered rivers that seemed to be about the same size: the Susquehanna, the Delaware, the Potomac. The data for this map come from the National Hydrography Dataset (NHDPlus v2) developed and managed by the US EPA and US Geological Survey, made available to the public and water resources community. Another extraordinary map created using the same dataset was recently published by Nelson Minar, a Google software engineer. Now if only you could see the Amazon, whose flow is more than ten times greater than the Mississippi. I live in MI, where we often note that Canada seems to have no weather according to some sources.
Blog round-up: Bloggers on Delta Plan lawsuits, the BDCP, and regional issues, plus data visualizations, Aquapedia, a super cool party trick, and more!
Andrew Goldsmith made this representation of the United States using words to represent the geographic boundaries of the named states.

The map illustrates the major rivers of the United States, which include: Missouri, Mississippi, Ohoi, Columbia, Colorado, Snake river, Red river, Arkansas, Brazos river, Pecos river, Rio Grande, Platte River, St Lawrence river.
The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country.
Using USGS data, Nelson Minar has created a vector tile map of all the water flowlines in the 48 contiguous states. After a devastating year of watershed runoff and heavily polluted Lake Okeechobee water releases into the Caloosahatchee on the heels of the 2004 and 2005 hurricane seasons, CRCA-Riverwatch documented the unprecedented destruction and submitted its evidence to American Rivers. Perhaps unsurprisingly, people have little sense of how their local water resources compare in size to other water resources. Anyone living in the West working on water issues becomes more familiar with the Colorado, the Sacramento, the San Joaquin, and the Rio Grande rivers, but still may have little sense of how much water flows through these different river systems on any given year. At the Pacific Institute we have used a new dataset to create a scaled map of the major rivers of the contiguous 48 United States. And while we share many rivers with our neighbors, this dataset, unfortunately, stops abruptly at the Canadian and Mexican borders. His maps show every river and stream channel identified by the National Hydrography Dataset project, including intermittent and ephemeral rivers that run dry for part or most of the year.

The symbols drawn here have widths proportional to the square root of the rivers’ estimated average annual discharge. If and when we get the data for Mexico and Canada, we can redo North America properly and show the great rivers of Canada and the proper flows of the rivers we share! The scale of the damage to the river and estuary's water quality, aquatic habitat, fish and wildlife was recognized as a national level ecological tragedy and American Rivers named the Caloosahatchee as the 7th Most Endangered River of 2006. We’re accustomed to seeing maps with what cartographers call proportional symbols: big cites get bigger dots than small ones, and interstate highways have a heavier line than county roads.
The purpose of this list is to heighten awareness among the public and the local, state, and national officials in an effort to prompt action. Rivers in Florida have been named to this list 5 times in the past 21 years: the Everglades in 1992 and 1993, Chattahoochee River in 1998, Apalachicola River in 2002, and the Peace River in 2004.

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