The following dataset includes "Active Benchmarks," which are provided to facilitate the identification of City-managed standard benchmarks. Standard benchmarks are for public and private use in establishing a point in space. 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 (DWM) 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 September 2011. Coordinates are estimated. To view map, go to https://data.cityofchicago.org/Buildings/Elevation-Benchmarks-Map/kmt9-pg57 or for PDF map, go to http://cityofchicago.org/content/dam/city/depts/water/supp_info/Benchmarks/BMMap.pdf. Please read the Terms of Use: http://www.cityofchicago.org/city/en/narr/foia/data_disclaimer.html.
This dataset has the following 12 columns:
| Column Name | API Column Name | Data Type | Sample Values |
|---|---|---|---|
| BENCHMARK NUMBER | benchmark_number | number | 124.000000 14.000000 323.000000 486.000000 348.000000 view top 100 |
| NORTHING | northing | number | 1865528.104000 1938919.693000 1905130.582000 1912636.151000 1830658.558000 view top 100 |
| EASTING | easting | number | 1158405.461000 1170641.716000 1155835.609000 1150803.609000 1201373.451000 view top 100 |
| ELEVATION | elevation | number | 31.173000 31.198000 41.463000 17.043000 15.629000 view top 100 |
| LOCATION DESCRIPTION | location_description | text | 99.5 FEET NORTH OF THE NORTH LINE OF W 59TH STREET 10.4 FEET N. OF S. LINE OF W. PERSHING ROAD 50.3 FEET SOUTH OF THE SOUTH LINE OF W BELMONT AVENUE 13.2 FEET SOUTH OF THE SOUTH LINE OF W FULLERTON AVENUE 8.8' E. OF W. LINE N. MASON AVE. view top 100 |
| LOCATION DESCRIPTION 2 | location_description_2 | text | 9.5 FEET EAST OF THE WEST LINE OF N ALBANY AVENUE 13.5' E. OF THE W LINE OF N. RACINE AVE. 11.5 FEET SOUTH OF THE NORTH LINE OF W 104TH STREET 11.2' N. OF N. LINE OF W. 34TH PL. 19 FEET N. OF N. LINE OF W. 71ST STREET view top 100 |
| MARK DESCRIPTION | mark_description | text | COPPER POINT IN CONCRETE SHAFT WITHOUT A COVER COVER OF THIS MONUMENT SET TO PERMANENT GRADE SW COR N. OF N.E. COR. NE COR view top 100 |
| YEAR BENCHMARK ELEVATION FIXED | year_benchmark_elevation_fixed | number | 1968.000000 1970.000000 1979.000000 1978.000000 1967.000000 view top 100 |
| BOOK NUMBER | book_number | number | 0.000000 77.000000 91.000000 410.000000 1741.000000 view top 100 |
| LATITUDE | latitude | number | 41.78674742400 41.97577326070 41.74334998290 41.84222259580 41.75001836350 view top 100 |
| LONGITUDE | longitude | number | -87.69474401670 -87.60359331850 -87.59692659680 -87.77451326070 -87.75459500550 view top 100 |
| ESTIMATED LOCATION | estimated_location | location | view top 100 |