|Main source||Greenfield Township, Grundy County, Illinois
|River mouth||Confluence with the Illinois River, Morris, Illinois
489 ft (149 m)
|Progression||Mazon River → Illinois → Mississippi → Gulf of Mexico|
|Length||28 mi (45 km)|
The Mazon River is associated with the Mazon Creek fossils of the Francis Creek Shale, which are also exposed in strip mines and quarries near the River. This fossil bed includes well-preserved fossils from the Pennsylvanian period of the Paleozoic era and is a world-famous Lagerstätten site.
The Mazon River is approximately 28 miles (45 km) in length, with the West Fork considered the main branch.
The river was named in honor of William Mason, a pioneer settler.
Cities and counties
The following cities, towns and villages are within the Mazon watershed:
The following counties are at least partly drained by the Mazon River:
- U.S. Geological Survey Geographic Names Information System: Mazon River
- U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map Archived 2012-04-05 at WebCite, accessed May 13, 2011
- Gannett, Henry (1905). The Origin of Certain Place Names in the United States. U.S. Government Printing Office. p. 202.
- American Whitewater
- Prairie State Canoeists
- Field Museum Collection, Mazon Creek Fossils
- Illinois State Museum, Mazon Creek Fossil Collection
- Prairie Rivers Network
- USGS Real-time Stream Gage Mazon River
- Upper Illinois/Mazon River watershed map (PDF)
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