Elevation Benchmarks

The following dataset, known as "Active Benchmarks," is provided to facilitate the identification of City-managed standard benchmarks. Standard benchmarks are for public and private use in establishing a point in space. This dataset was last updated February 2011. Click here to view map.

Click Menu in the upper right-hand corner of the Data Player below to: view, print, or download this data set or access the data via API. To sort or remove columns, click More Views. Click the Share button on the left, which is just below the Menu button, to email data or post to social networks. To view the date last updated, click on the Info button, which is on the right just below the City seal.

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Description: This dataset provides "Active Benchmarks," which facilitate the identification of City-managed standard benchmarks. Standard benchmarks establish a point in space, and are used by surveyors in measuring site elevations, or as a starting point for surveys. To view map, go to https://data.cityofchicago.org/Buildings/Elevation-Benchmarks-Map/kmt9-pg57 or for PDF map click here.

The dataset includes the following attributes for each benchmark: number, northing, easting, elevation, location description, mark description, year benchmark elevation was fixed, book number, and comments.

Note: The Benchmarks are referenced to the Chicago City Datum = 0.00, (CCD = 579.88 feet above mean tide New York).

The City of Chicago Department of Water Management’s [Topographic Benchmark] is the source of the benchmark information contained in this online database. The information contained in the index card system was compiled by scanning the original cards, then transcribing some of this information to prepare a table and map. Over time, the DWM will contract services to field verify the data and update the index card system and this online database.

This dataset was last updated February 2011. Please read the Terms of Use.

Data Owner: Water Management

Last Updated: February 2011

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