East Fork Cimarron River

{{Infobox river

| name = East Fork Cimarron River{{cite gnis|id= 188469 |name=East Fork Cimarron River|accessdate= 2011-02-14}}

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| mouth_location = Confluence with Middle Fork

| mouth_coordinates = {{coord|38|12|15|N|107|31|11|W|display=inline,title}}

| progression = Cimarron—Gunnison—Colorado

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| mouth_elevation = {{convert|9022|ft|m|abbr=on}}

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East Fork Cimarron River is a {{convert|12.6|mi|km|adj=mid|-long}}U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. [http://viewer.nationalmap.gov/viewer/ The National Map] {{webarchive|url=https://web.archive.org/web/20120329155652/http://viewer.nationalmap.gov/viewer/ |date=2012-03-29 }}, accessed March 18, 2011 tributary of the Cimarron River in Colorado. The river's source is near Wetterhorn Peak in the Uncompahgre Wilderness of Hinsdale County. It joins the Middle Fork Cimarron River in Gunnison County to form the Cimarron River, and is impounded by Silver Jack Dam.