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Johnson Creek is a 25-mile (40 km) tributary of the Willamette River in the Portland metropolitan area of the U.S. state of Oregon.Part of the drainage basin of the Columbia River, its catchment consists of 54 square miles (140 km 2) of mostly urban land occupied by about 180,000 people as of 2012.
All rivers with average discharge more than 15,000 cubic feet per second are listed. Estimates are approximate, because data are variable with time period measured and also because many rivers lack a gauging station near their point of outflow.
In fiscal year 2008, the USGS provided 35% of the funding for everyday operation and maintenance of gauges. [8] Additionally, USGS uses hydrographs to study streamflow in rivers. A hydrograph is a chart showing, most often, river stage (height of the water above an arbitrary altitude) and streamflow (amount of water, usually in cubic feet per ...
The water-quality data include highway-runoff-quality statistics, upstream-water-quality statistics, downstream-water-quality definitions, and BMP-performance statistics. There also is a GUI form for running the model and accessing the distinct set of output files.
USGS operates a number of water-related programs, notably the National Streamflow Information Program [23] and National Water-Quality Assessment Program. [24] USGS Water data is publicly available from their National Water Information System [25] database.
The USGS and the water bureau operate a stream gauge at RM 4.7 (RK 7.6), which is 1.8 miles (2.9 km) downstream from Bull Run Reservoir 2 and the water system intake. Measurements are for the river only and do not include water diverted upstream of the gauge to the city water supply or to a former power plant.
Within the USGS, the Water Resources Division carries the responsibility for monitoring water resources. To establish a stream gauge, USGS personnel first choose a site on a stream where the geometry is relatively stable and there is a suitable location to make discrete direct measurements of streamflow using specialized equipment.
The average flow of the creek at this station in 2008, the only full calendar year for which data was available in 2010, was 202 cubic feet per second (5.7 m 3 /s). [5] The maximum flow recorded there was 1,880 cubic feet per second (53 m 3 /s) on January 11, 2008, [ 9 ] and the minimum flow was 6.4 cubic feet per second (0.18 m 3 /s) on ...