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."

The U.S. Geological Survey-Illinois Water Science Center collected bathymetric data in Lake Calumet and a portion of the Calumet River in the vicinity of Lake Calumet to produce a bathymetric map. The bathymetric survey was conducted over three days (July 26, September 11, and November 7, 2012). Lake Calumet has become a focus area for Asian carp rapid response efforts by state and federal agencies and very little bathymetric data existed prior to this survey. This bathymetric survey provides data for a variety of scientific and engineering studies of the area; for example, hydraulic modelling of water and sediment transport from Lake Calumet to the Calumet River.

These data are single-beam bathymetry points compiled in comma separated values (CSV) file format, generated from a hydrographic survey of the northern portion of Lake Calumet in Cook County, Illinois. Hydrographic data were collected July 18-19, 2023, using a single-beam echosounder (SBES) integrated with a Global Navigation Satellite System (GNSS) mounted on a marine survey vessel. Surface water elevation data were collected July 18 utilizing a single-base real-time kinematic (RTK)/GNSS unit. Bathymetric data points were collected as the vessel traversed the northern portions of the lake along overlapping survey lines. The SBES internally collected and stored the depth data from the echosounder and the horizontal and vertical position data of the vessel from the GNSS in real time. Data processing required specialized computer software to export bathymetry data from the raw data files. A Python script was written to calculate the lakebed elevations and identify outliers in the dataset. These data are provided in comma separated values (CSV) format as LakeCalumet_SBES_20230718.csv. Data points are stored as a series of x (longitude), y (latitude), and z (elevation or depth) points along with variable length records specific to the data transects.

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.

These data are high-resolution bathymetry (riverbed elevation) in compressed LAS (*.laz) format, generated from the July 17–18, 2023, hydrographic survey of the North Branch Chicago River and North Shore Channel in Cook County, Illinois. The survey extends from near the North Avenue Turning Basin and Goose Island in the south, upstream to the Metropolitan Water Reclamation District (MWRD) Wilmette Pumping station in the north. The survey is a continuation of the bathymetric survey of the Chicago River and Chicago Sanitary and Ship Canal (CS&SC) in Cook County, Illinois, conducted August 22–24, 2022 (Huizinga and Rivers, 2023). These data also include an ultra-high resolution resurvey of a large sunken vessel discovered in August 2022 in the eastern channel near Goose Island. 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 NChicagoRivChannel_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 NChicagoRivChannel_bathymetry_2023-07.laz. This bathymetry dataset is a subset of the full-resolution data in the NChicagoRivChannel_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.

In 2023, the U.S. Geological Survey (USGS), in collaboration with the Cook County Bureau of Technology (BoT), conducted comprehensive hydrographic and water quality surveys, along with activity and disturbance assessments of 58 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 2023 for the following 58 water bodies listed in alphabetical order: 59th Street Harbor, Beck Lake, Belleau Lake, Bergman Slough, Beverly Lake, Big Bend, Big Marsh, Big Marsh NE (3 Fingers Pond), Burnham Prairie Marsh West, Columbus Park Lagoon, Crawdad Slough, Diversey Harbor, Douglass Park Lagoon, Garfield Park Lagoon, Goose Lake (East and West), Humboldt Park Lagoon, Jackson Park East Lagoon, Jackson Park Inner Harbor, Jackson Park Outer Harbor, Jackson Park West Lagoon, Joes Pond, Lake Calumet, Lake Glenview, Lake Ida, Lake Shermerville, Longjohn Slough, Marquette Park Lagoon, McGinnis Slough, McGinty Slough, McKinley Park Lagoon, North Pond (Lincoln Park), Palatine Marsh South, Pogie Lake, Sag Quarry East, Sherman Park Lagoon, Skokie Lagoons 1 through 7, South Pond (Lincoln Park), Tampier Lake, Tampier Slough North, Tampier Slough South, Tampier Slough West, Tampier Slough Will Cook Rd., Tomahawk Slough, Tryners Pond, Tuma Lake, Turtlehead Lake, Unknown A27280010, Unknown A27330013, Unknown A33290005, and Washington Park Lagoon. This data release provides water body survey data in three parts: (1) Single-beam data for lakes surveyed in 2023 except Lake Calumet. (2) Lake Calumet multibeam survey from June 30, 2023. (3) Lake Calumet single-beam survey from July 18-19, 2023. First posted June 26, 2024, ver. 1.0 Revised November 12, 2024, ver. 2.0

In 2024, the U.S. Geological Survey (USGS), in collaboration with the Cook County Bureau of Technology (BOT), carried out comprehensive hydrographic and water-quality surveys, and activity and disturbance assessments of 44 total water bodies encompassing lakes and rivers 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 the BOT with resource management decisions and practices and 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 2024 for the following water bodies listed in alphabetical order: Barrington Road Pond, Butterfield Creek Lake, Cermak Quarry, Chicago Botanic Garden lakes (East Lake, Great Basin, Japanese Garden Lake, North Lake, Prairie Lake, South Lake, and West Lake (includes Spider Pool)), Cranberry Slough, Des Plaines River, Dr. Mary Woodland Reservoir, Eggers Grove Marsh, Glenbrook Park Lake, Indian Ridge Marsh Ponds (1, 4, 5, and 8), Lake Sedgewick, MacIntyre Pond, Margreth Riemer Reservoir East, Margreth Riemer Reservoir West, O'Malley Ponds (Central, North, and South), Penny Road Pond, Peregrine Lake, Phoenix Lake, Plum Grove Reservoir, Poplar Creek, Potawatomi Pond, Rolling Knolls Pond, Schiller Pond, Schultz Park Lake, Skokie Lagoon 3 Channel (main lagoon surveyed in 2023), Skokie River, Spring Creek Valley North, Thatcher Glen Pond, Tom T. Hamilton Reservoir, Volkening Lake, and Whitford Pond. First posted August 23, 2024, ver. 1.0 Revised February 11, 2025, ver. 2.0

In 2024, the U.S. Geological Survey (USGS), in collaboration with the Cook County Bureau of Technology (BOT), carried out comprehensive hydrographic and water-quality surveys, and activity and disturbance assessments of 44 total water bodies encompassing lakes and rivers 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 the BOT with resource management decisions and practices and 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 2024 for the following water bodies listed in alphabetical order: Barrington Road Pond, Butterfield Creek Lake, Cermak Quarry, Chicago Botanic Garden lakes (East Lake, Great Basin, Japanese Garden Lake, North Lake, Prairie Lake, South Lake, and West Lake (includes Spider Pool)), Cranberry Slough, Des Plaines River, Dr. Mary Woodland Reservoir, Eggers Grove Marsh, Glenbrook Park Lake, Indian Ridge Marsh Ponds (1, 4, 5, and 8), Lake Sedgewick, MacIntyre Pond, Margreth Riemer Reservoir East, Margreth Riemer Reservoir West, O'Malley Ponds (Central, North, and South), Penny Road Pond, Peregrine Lake, Phoenix Lake, Plum Grove Reservoir, Poplar Creek, Potawatomi Pond, Rolling Knolls Pond, Schiller Pond, Schultz Park Lake, Skokie Lagoon 3 Channel (main lagoon surveyed in 2023), Skokie River, Spring Creek Valley North, Thatcher Glen Pond, Tom T. Hamilton Reservoir, Volkening Lake, and Whitford Pond. First posted August 23, 2024, ver. 1.0 Revised February 11, 2025, ver. 2.0