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Mississippi River Pool Lock and Dam 26 at Alton,IL (USGS-05587498) site data in the Water Quality Portal

Data Provider: NWIS (Learn more about Water Quality Portal Data Providers)

This stream site, maintained by the USGS Missouri Water Science Center (identifier USGS-MO), has the name "Mississippi River Pool Lock and Dam 26 at Alton,IL" and has the identifier USGS-05587498. This site is in the watershed defined by the 8 digit Hydrologic Unit Code (HUC)07110009. See more details of this site the the USGS NWIS Web page for this site.

This site is located in Madison County County, Illinois at 38.88730556000000 degrees latitude and -90.1840000000000 degrees longitude using the datum NAD83. The horizontal location collection method was "Interpolated from Digital MAP." and the accuracy is 5 seconds. The source map scale is 1:24000. This site is at an elevation of 399.66 feet and the accuracy of the elevation measurement, collected using the method "GNSS2 - Level 2 Quality Survey Grade Global Navigation Satellite System" is .17 feet. The vertical coordinate reference system is NAVD88.

What other monitoring locations are upstream or downstream from this one?

This map shows all Water Quality Portal stations that are 10 miles upstream (dashed dark blue) and 10 miles downstream (solid light blue) of this monitoring location (indicated by the large blue circle). The upstream and downstream functionality is provided by the Network Linked Data Index.

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Leaflet | USGS The National Map: National Boundaries Dataset, 3DEP Elevation Program, Geographic Names Information System, National Hydrography Dataset, National Land Cover Database, National Structures Dataset, and National Transportation Dataset; USGS Global Ecosystems; U.S. Census Bureau TIGER/Line data; USFS Road data; Natural Earth Data; U.S. Department of State HIU; NOAA National Centers for Environmental Information. Data refreshed July 22, 2025.

What other information is available for this location?

For the definitions of the metadata elements, please go to the Water Quality Portal user guide