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Topographic Maps of Imperial County, California

June 6, 2007

This collection contains images of all 7.5-minute USGS topographic maps of Imperial County, California.

To find the desired image, look on the layout map below.

To view an image, click on the name of the map in the list at the end of this page. CAUTION: Most versions of Windows Internet Explorer won't display these images because they are too large. If you have this problem, download the image and use your favorite image software (or the Windows Picture and Fax Viewer) to view it. Or you can download the Mozilla Firefox browser from

If your browser does clickable maps, you can also view an image by clicking on it in the layout map.

To download an image, right-click on the name and select "Save Link" or "Save Target" from the context menu.

The scale of the images is 528 pixels per mile.

The file LIST.TXT contains a comma-delimited list of all 7.5-minute maps. The fields in each list entry are as follows:

  1. name of map
  2. latitude degrees
  3. latitude minutes
  4. longitude degrees
  5. longitude minutes

The latitude and longitude are those of the southeast corner of the mapped area.

The list can be imported into most spreadsheets and database management systems.

The IN-KOH-PAH GORGE map has two entries LIST.TXT. It contains slightly more than the standard 7.5 minutes of latitude and longitude. The excess is an area at the edge of United States that is not large enough to merit a separate map, but it is listed in LIST.TXT as though it were a separate map with the same name.

The images for this collection were downloaded from the California Spatial Information Library.

The USGS topographic maps, the downloaded images, and the images in this collection are all in the public domain. You may use them for any legal purpose without permission or royalties. Although the maps are generally quite accurate, many of them are significantly out of date.

Philip J. Erdelsky

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