Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

New WQX 3.0 profiles are available at waterqualitydata.us/beta/. These profiles will contain recent USGS data added since March 11, 2024, which marks the beginning of limited accessibility for USGS data. Read more about the 3.0 profiles and associated changes here. This user interface only serves WQX2.2 profiles, which do NOT contain USGS data added after March 11, 2024.

WQP Home >  Providers >  STORET >  MDC >  MDC-3699/6.55

Mississippi River .55 DS lock and dam 25 (MDC-3699/6.55) site data in the Water Quality Portal

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

This river/stream site, maintained by the Missouri Dept. of Conservation (identifier MDC), has the name "Mississippi River .55 DS lock and dam 25" and has the identifier MDC-3699/6.55. This site is in the watershed defined by the 8 digit Hydrologic Unit Code (HUC)07110004.

This site is located in Calhoun County County, Illinois at 38.9988606400 degrees latitude and -90.6793997869 degrees longitude using the datum NAD83. The horizontal location collection method was "Interpolation-Map" and the accuracy is 12 m. The source map scale is 1:24000.

To download the metadata about this site along with water quality data, go to the Portal Page and enter "MDC-3699/6.55" into the "Site ID" box under Site Parameters

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

Upstream and downstream locations

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.

When were data collected at this location?

Periods of record for data characteristic groups

For a more detailed breakdown of data, go to the Monitoring Report at the EPA How's My Waterway Application
Characteristic Group Date Range*
Inorganics, Minor, Metals 2024 - 2024
Inorganics, Minor, Non-metals 2024 - 2024
Organics, Pesticide 2024 - 2024
*Date ranges may contain gap years

What other information is available for this location?

Detailed Metadata

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

Location Metadata Value
OrganizationIdentifier MDC
OrganizationFormalName Missouri Dept. of Conservation
MonitoringLocationIdentifier MDC-3699/6.55
MonitoringLocationName Mississippi River .55 DS lock and dam 25
MonitoringLocationTypeName River/Stream
HUCEightDigitCode 07110004
LatitudeMeasure 38.9988606400
LongitudeMeasure -90.6793997869
SourceMapScaleNumeric 24000
HorizontalAccuracyMeasure/MeasureValue 12
HorizontalAccuracyMeasure/MeasureUnitCode m
HorizontalCollectionMethodName Interpolation-Map
HorizontalCoordinateReferenceSystemDatumName NAD83
CountryCode US
StateCode 17
CountyCode 013
ProviderName STORET