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.

These data are high-resolution bathymetry (riverbed elevation) in compressed LAS (*.laz) format, generated from the July 17–19, 2023, hydrographic survey of Bubbly Creek and various sidings, harbors, and turning basins on the Chicago Sanitary and Ship Canal (CS&SC) in Cook County, Illinois. The survey includes all Bubbly Creek from the confluence with the CS&SC in the north to the Racine Avenue Pump station in the south; various sidings and turning basins along the CS&SC between Kedzie Avenue and South Halsted Street; and the Marine Safety Station harbor near the Chicago Harbor Lock on Lake Michigan. This survey is a continuation and enhancement of the bathymetric survey of the CS&SC in Cook County, Illinois, conducted August 22–24, 2022 (Huizinga and Rivers, 2023). 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 full-resolution data are provided in American Society for Photogrammetry and Remote Sensing (ASPRS) compressed LAS format as BubblyCr_CSSCsidings_bathymetry_2023-07_fullres.laz. This bathymetry dataset is the full-resolution, near-raw data output from the processing software. This dataset has undergone limited cleanup and editing to remove obvious stray data and aquatic vegetation, but data editing was minimized to retain detail. Furthermore, this dataset is large, and may not be readily viewable without specialized software. The reduced-resolution data also are provided in ASPRS compressed LAS format as BubblyCr_CSSCsidings_bathymetry_2023-07.laz. This bathymetry dataset is a subset of the full-resolution data in the BubblyCr_CSSCsidings_bathymetry_2023-07_fullres.laz file, reduced to a nominal 0.5-meter point spacing. The compressed 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. Reference Cited: Huizinga, R.J., and Rivers, B.C., 2023, Chicago River and Chicago Sanitary and Ship Canal Bathymetry in Cook County, Illinois, August 2022: U.S. Geological Survey data release, https://doi.org/10.5066/P94TL2PV.

These data are high-resolution bathymetry (riverbed elevation) in compressed LAS (*.laz) format, generated from the July 17–19, 2023, hydrographic survey of Bubbly Creek and various sidings, harbors, and turning basins on the Chicago Sanitary and Ship Canal (CS&SC) in Cook County, Illinois. The survey includes all Bubbly Creek from the confluence with the CS&SC in the north to the Racine Avenue Pump station in the south; various sidings and turning basins along the CS&SC between Kedzie Avenue and South Halsted Street; and the Marine Safety Station harbor near the Chicago Harbor Lock on Lake Michigan. This survey is a continuation and enhancement of the bathymetric survey of the CS&SC in Cook County, Illinois, conducted August 22–24, 2022 (Huizinga and Rivers, 2023). 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 full-resolution data are provided in American Society for Photogrammetry and Remote Sensing (ASPRS) compressed LAS format as BubblyCr_CSSCsidings_bathymetry_2023-07_fullres.laz. This bathymetry dataset is the full-resolution, near-raw data output from the processing software. This dataset has undergone limited cleanup and editing to remove obvious stray data and aquatic vegetation, but data editing was minimized to retain detail. Furthermore, this dataset is large, and may not be readily viewable without specialized software. The reduced-resolution data also are provided in ASPRS compressed LAS format as BubblyCr_CSSCsidings_bathymetry_2023-07.laz. This bathymetry dataset is a subset of the full-resolution data in the BubblyCr_CSSCsidings_bathymetry_2023-07_fullres.laz file, reduced to a nominal 0.5-meter point spacing. The compressed 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. Reference Cited: Huizinga, R.J., and Rivers, B.C., 2023, Chicago River and Chicago Sanitary and Ship Canal Bathymetry in Cook County, Illinois, August 2022: U.S. Geological Survey data release, https://doi.org/10.5066/P94TL2PV.

These data are high-resolution bathymetry (lakebed elevation) of the southern portion of Lake Calumet in Cook County, Illinois, acquired from a hydrographic survey on June 30, 2023. This dataset is provided as American Society for Photogrammetry and Remove Sensing (ASPRS) compressed LAS (*laz) files, a standardized binary format for storing three-dimensional point cloud data as a series of x (longitude), y (latitude), and z (elevation) points and attributes (ASPRS, 2011). This survey utilized a multibeam echosounder mapping system (MBMS), which consists of a multibeam echosounder (MBES) and an internal navigation system (INS) mounted on a marine survey vessel. Data were collected as the vessel traversed the lake along overlapping longitudinal survey lines. Data collection software integrated and stored the depth data from the MBES, along with the horizontal position and vertical attitude data of the vessel from the INS in real time. Proprietary computer software was used to post-process bathymetry data from the real-time data files for final export. The northern portion of the lake, characterized by shallower depths, was surveyed using a single-beam echosounder in July 2023; those data are available within this data release but are not included in the compressed LAS files. The bathymetric dataset, provided in ASPRS compressed LAS format as "LakeCalumet_MBES_20230630_fullres.laz," represents the data at its full resolution obtained during data collection with minimal cleanup to preserve as much detail as possible. Any edits made to the dataset were focused on removing obvious outliers clearly distinguishable from genuine bathymetric details. Please note that the full-resolution dataset is large and may not be readily viewable without specialized software. A reduced-resolution version of the full dataset was created featuring a nominal 0.5-meter (m) point spacing to enhance accessibility and usability. This downscaled dataset is provided in ASPRS compressed LAS format as "LakeCalumet_MBES_20230630_reducedres.laz."

These data are high-resolution bathymetry (lakebed elevation) of the southern portion of Lake Calumet in Cook County, Illinois, acquired from a hydrographic survey on June 30, 2023. This dataset is provided as American Society for Photogrammetry and Remove Sensing (ASPRS) compressed LAS (*laz) files, a standardized binary format for storing three-dimensional point cloud data as a series of x (longitude), y (latitude), and z (elevation) points and attributes (ASPRS, 2011). This survey utilized a multibeam echosounder mapping system (MBMS), which consists of a multibeam echosounder (MBES) and an internal navigation system (INS) mounted on a marine survey vessel. Data were collected as the vessel traversed the lake along overlapping longitudinal survey lines. Data collection software integrated and stored the depth data from the MBES, along with the horizontal position and vertical attitude data of the vessel from the INS in real time. Proprietary computer software was used to post-process bathymetry data from the real-time data files for final export. The northern portion of the lake, characterized by shallower depths, was surveyed using a single-beam echosounder in July 2023; those data are available within this data release but are not included in the compressed LAS files. The bathymetric dataset, provided in ASPRS compressed LAS format as "LakeCalumet_MBES_20230630_fullres.laz," represents the data at its full resolution obtained during data collection with minimal cleanup to preserve as much detail as possible. Any edits made to the dataset were focused on removing obvious outliers clearly distinguishable from genuine bathymetric details. Please note that the full-resolution dataset is large and may not be readily viewable without specialized software. A reduced-resolution version of the full dataset was created featuring a nominal 0.5-meter (m) point spacing to enhance accessibility and usability. This downscaled dataset is provided in ASPRS compressed LAS format as "LakeCalumet_MBES_20230630_reducedres.laz."

These data are high-resolution bathymetry (riverbed elevation) in LAS format, generated from the August 1-3, 2022, hydrographic survey of the Calumet River and Calumet Sag Channel in Cook County, Illinois. The survey extends from the junction with Lake Michigan in the northeast downstream to the junction with the Chicago Sanitary and Ship Canal in the southwest. 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 channel 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 CalSagChannel_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 1-3, 2022, hydrographic survey of the Calumet River and Calumet Sag Channel in Cook County, Illinois. The survey extends from the junction with Lake Michigan in the northeast downstream to the junction with the Chicago Sanitary and Ship Canal in the southwest. 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 channel 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 CalSagChannel_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.

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