These data files include georeferenced water-quality data with associated time stamps (Central Standard Time) for basic water-quality parameters as measured by a towed multiparameter sonde (YSI 6920 sonde) from a manned boat in the Chicago Sanitary and Ship Canal. Data were collected on February 25-27, 2010, and again on March 2-3, 2010. The data collected in February 2010 had the sonde on a fixed mount about 1 foot below the surface. The data collected in March 2010 had the sonde on a towed cable about 7-9 feet below the surface. All data have been edited and reviewed. Omitted data have been flagged with a data value of -9999 in the data files.

In June and July of 2020, 45 groundwater wells in McHenry County, Illinois, were sampled for water quality (field properties, major ions, nutrients, and trace metals) and 12 wells were sampled for contaminants of emerging concern (pharmaceuticals, pesticides, and wastewater indicator compounds). Quality-assurance and quality-control samples were collected during the June and July 2020 sampling that included equipment blanks, field blanks, and replicates. The results of these samples were used to understand the sources of bias and variability associated with sample collection, processing, storage, and shipping. This data release contains one comma separated values files containing the results of the quality-control sample collection for general water quality (metals, nutrients, and major ions) and contaminants of emerging concern (wastewater indicator compounds and pharmaceuticals). Water-quality data from the associated groundwater monitoring well data are available at the National Water Information System (NWIS) web database (https://doi.org/10.5066/F7P55KJN). Results and discussion of the water quality and contaminants of emerging concern can also be found in the associated scientific investigation report referenced.

In June and July of 2020, 45 groundwater wells in McHenry County, Illinois, were sampled for water quality (field properties, major ions, nutrients, and trace metals) and 12 wells were sampled for contaminants of emerging concern (pharmaceuticals, pesticides, and wastewater indicator compounds). Quality-assurance and quality-control samples were collected during the June and July 2020 sampling that included equipment blanks, field blanks, and replicates. The results of these samples were used to understand the sources of bias and variability associated with sample collection, processing, storage, and shipping. This data release contains one comma separated values files containing the results of the quality-control sample collection for general water quality (metals, nutrients, and major ions) and contaminants of emerging concern (wastewater indicator compounds and pharmaceuticals). Water-quality data from the associated groundwater monitoring well data are available at the National Water Information System (NWIS) web database (https://doi.org/10.5066/F7P55KJN). Results and discussion of the water quality and contaminants of emerging concern can also be found in the associated scientific investigation report referenced.

These data are high-resolution bathymetry (riverbed elevation) in LAS format, generated from the August 22-24, 2022, hydrographic survey of the Chicago Sanitary and Ship Canal (CS&SC) and sections of the Chicago River and North Branch Chicago River in Cook County, Illinois. The survey extends from the Cook County line near Interstate 355 in the southwest upstream to the Chicago Harbor Lock on the Chicago River in the northeast, and northward on the North Branch Chicago River to the North Avenue Turning Basin in the north. Hydrographic data were collected using a high-resolution multibeam echosounder mapping system (MBMS), which consists of a multibeam echosounder (MBES) and an inertial navigation system (INS) mounted on a marine survey vessel. Data were collected as the vessel traversed the river along overlapping longitudinal survey lines distributed throughout the reach. Data collection software integrated and stored the depth data from the MBES and the horizontal and vertical position and attitude data of the vessel from the INS in real time. Data processing required specialized computer software to extract bathymetry data from the raw data files and to summarize and map the information. The bathymetry dataset is provided in American Society for Photogrammetry and Remote Sensing (ASPRS) LAS format with metadata as ChicagoSSCanal_bathymetry_2022-08.las. The LAS format is a standardized binary format for storing 3-dimensional point cloud data and point attributes along with header information and variable length records specific to the data. Data points are stored as a 3-dimensional data cloud as a series of x (longitude), y (latitude), and z (elevation) points. Please refer to http://www.asprs.org/Committee-General/LASer-LAS-File-Format-Exchange-Activities.html for additional information.

These data are high-resolution bathymetry (riverbed elevation) in LAS format, generated from the August 22-24, 2022, hydrographic survey of the Chicago Sanitary and Ship Canal (CS&SC) and sections of the Chicago River and North Branch Chicago River in Cook County, Illinois. The survey extends from the Cook County line near Interstate 355 in the southwest upstream to the Chicago Harbor Lock on the Chicago River in the northeast, and northward on the North Branch Chicago River to the North Avenue Turning Basin in the north. Hydrographic data were collected using a high-resolution multibeam echosounder mapping system (MBMS), which consists of a multibeam echosounder (MBES) and an inertial navigation system (INS) mounted on a marine survey vessel. Data were collected as the vessel traversed the river along overlapping longitudinal survey lines distributed throughout the reach. Data collection software integrated and stored the depth data from the MBES and the horizontal and vertical position and attitude data of the vessel from the INS in real time. Data processing required specialized computer software to extract bathymetry data from the raw data files and to summarize and map the information. The bathymetry dataset is provided in American Society for Photogrammetry and Remote Sensing (ASPRS) LAS format with metadata as ChicagoSSCanal_bathymetry_2022-08.las. The LAS format is a standardized binary format for storing 3-dimensional point cloud data and point attributes along with header information and variable length records specific to the data. Data points are stored as a 3-dimensional data cloud as a series of x (longitude), y (latitude), and z (elevation) points. Please refer to http://www.asprs.org/Committee-General/LASer-LAS-File-Format-Exchange-Activities.html for additional information.

This dataset includes water temperature and specific conductance (TC) data measured at USGS streamgage number 05536995 (Chicago Sanitary and Ship Canal at Romeoville, IL). Four Campbell® Scientific SC547 TC probes are positioned in a natural niche on east (left) bank 1200 feet downstream of the stage gage at this site. The TC data are measured every five minutes at four gage height levels (P1 = 21 feet, P2 = 17 feet, P3 = 13 feet, P4 = 9 feet). The gage datum is 551.76 feet above the North American Vertical Datum of 1988 (NAVD88). The annual statistics of TC (minimum, maximum, mean, median, and standard deviation) for Water Year 2018 are provided in a comma separated value (csv) file.

This dataset includes water temperature and specific conductance (TC) data measured at USGS streamgage number 05536995 (Chicago Sanitary and Ship Canal at Romeoville, IL). Four Campbell® Scientific SC547 TC probes are positioned in a natural niche on east (left) bank 1200 feet downstream of the stage gage at this site. The TC data are measured every five minutes at four gage height levels (P1 = 21 feet, P2 = 17 feet, P3 = 13 feet, P4 = 9 feet). The gage datum is 551.76 feet above the North American Vertical Datum of 1988 (NAVD88). The annual statistics of TC (minimum, maximum, mean, median, and standard deviation) for Water Year 2018 are provided in a comma separated value (csv) file.

In 2022, the U.S. Geological Survey (USGS), in collaboration with the Cook County Bureau of Technology (BOT), carried out comprehensive hydrographic and water quality surveys, along with activity and disturbance assessments of 41 total water bodies encompassing lakes, rivers, and canals within Cook County, Illinois. These surveys and assessments describe the bathymetry, water-quality conditions, and on-site field crew observations and impressions for each water body and its surrounding catchment area. Data collected may assist BOT with resource management decisions and practices, as well as contribute to an inventory that can be shared with other local governmental agencies. Included in this data release are bathymetric, water quality, and observational findings gathered in 2022 for the following water bodies listed in alphabetical order: Axehead Lake, Baker's Lake, Belly Deep Slough, Bode Lake North, Bode Lake South, Bull Frog Lake, Busse Lake Main Pool, Busse Lake North Pool, Busse Lake South Pool, Busse Woods Reservoir, Consumers Quarry, Crabtree Lake, Doughnut Lake, Flatfoot Lake, Forge Quarry, Great Lakes Quarries East, Great Lakes Quarries West, Green Lake, Horsetail Lake, Icebox Quarry, Lake Arlington, Lake Arrowhead, Lake Charlemagne, Lake Opeka, Maple Lake, Midlothian Reservoir East, Midlothian Reservoir West, Papoose Lake, Powderhorn Lake South, Sag Quarry West, Saganashkee Slough, Sauk Lake, Vollmer Road Wildlife Pond East, Vollmer Road Wildlife Pond Middle, Vollmer Road Wildlife Pond West, Wampum Lake, Westbury Park Lake, Wolf Lake Pond 1, Wolf Lake Pond 2, Wolf Lake Pond 3, Wolf Lake Pond 4, and Wolf Lake Pond 8. First posted July 17, 2023, ver. 1.0 Revised January 17, 2025, ver. 2.0

In 2022, the U.S. Geological Survey (USGS), in collaboration with the Cook County Bureau of Technology (BOT), carried out comprehensive hydrographic and water quality surveys, along with activity and disturbance assessments of 41 total water bodies encompassing lakes, rivers, and canals within Cook County, Illinois. These surveys and assessments describe the bathymetry, water-quality conditions, and on-site field crew observations and impressions for each water body and its surrounding catchment area. Data collected may assist BOT with resource management decisions and practices, as well as contribute to an inventory that can be shared with other local governmental agencies. Included in this data release are bathymetric, water quality, and observational findings gathered in 2022 for the following water bodies listed in alphabetical order: Axehead Lake, Baker's Lake, Belly Deep Slough, Bode Lake North, Bode Lake South, Bull Frog Lake, Busse Lake Main Pool, Busse Lake North Pool, Busse Lake South Pool, Busse Woods Reservoir, Consumers Quarry, Crabtree Lake, Doughnut Lake, Flatfoot Lake, Forge Quarry, Great Lakes Quarries East, Great Lakes Quarries West, Green Lake, Horsetail Lake, Icebox Quarry, Lake Arlington, Lake Arrowhead, Lake Charlemagne, Lake Opeka, Maple Lake, Midlothian Reservoir East, Midlothian Reservoir West, Papoose Lake, Powderhorn Lake South, Sag Quarry West, Saganashkee Slough, Sauk Lake, Vollmer Road Wildlife Pond East, Vollmer Road Wildlife Pond Middle, Vollmer Road Wildlife Pond West, Wampum Lake, Westbury Park Lake, Wolf Lake Pond 1, Wolf Lake Pond 2, Wolf Lake Pond 3, Wolf Lake Pond 4, and Wolf Lake Pond 8. First posted July 17, 2023, ver. 1.0 Revised January 17, 2025, ver. 2.0

In 2022, the U.S. Geological Survey (USGS), in collaboration with the Cook County Bureau of Technology (BOT), carried out comprehensive hydrographic and water quality surveys, along with activity and disturbance assessments of 41 total water bodies encompassing lakes, rivers, and canals within Cook County, Illinois. These surveys and assessments describe the bathymetry, water-quality conditions, and on-site field crew observations and impressions for each water body and its surrounding catchment area. Data collected may assist BOT with resource management decisions and practices, as well as contribute to an inventory that can be shared with other local governmental agencies. Included in this data release are bathymetric, water quality, and observational findings gathered in 2022 for the following water bodies listed in alphabetical order: Axehead Lake, Baker's Lake, Belly Deep Slough, Bode Lake North, Bode Lake South, Bull Frog Lake, Busse Lake Main Pool, Busse Lake North Pool, Busse Lake South Pool, Busse Woods Reservoir, Consumers Quarry, Crabtree Lake, Doughnut Lake, Flatfoot Lake, Forge Quarry, Great Lakes Quarries East, Great Lakes Quarries West, Green Lake, Horsetail Lake, Icebox Quarry, Lake Arlington, Lake Arrowhead, Lake Charlemagne, Lake Opeka, Maple Lake, Midlothian Reservoir East, Midlothian Reservoir West, Papoose Lake, Powderhorn Lake South, Sag Quarry West, Saganashkee Slough, Sauk Lake, Vollmer Road Wildlife Pond East, Vollmer Road Wildlife Pond Middle, Vollmer Road Wildlife Pond West, Wampum Lake, Westbury Park Lake, Wolf Lake Pond 1, Wolf Lake Pond 2, Wolf Lake Pond 3, Wolf Lake Pond 4, and Wolf Lake Pond 8. First posted July 17, 2023, ver. 1.0 Revised January 17, 2025, ver. 2.0