Coal Creek flows from the west slope of the part of the Wasatch Mountain range which is located in the southeast part of Iron County, Utah. Its drainage area is almost 100 square miles.
Seasonal and daily stream-flow fluctuations are very pronounced. During the high water of spring the flow has reached more than 600 second-feet. At the time of high water, the daily fluctuations are the greatest. During the low water season in July and August, the flow has dropped as low as 12 second-feet since 1917, when accurate records were first kept; and, from the accounts of early settlers, there have been times when the stream was too low to be of any service for irrigation.
Fife, Arthur, "Bulletin No. 181 - Duty-of-Water Investigations on Coal Creek, Utah" (1922). UAES Bulletins. Paper 147.