2026-04-03T19:00:00-06:00
The National Weather Service in Denver has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 8 AM to 7 PM MDT Friday. * AFFECTED AREA...Fire Weather Zones 238, 239, 240, 241, 242, 243, 244, 245, 248, 249, 250 and 251. * TIMING...From 8 AM to 7 PM MDT Friday. * WINDS...Northwest 20 to 35 mph, with gusts around 45 mph. Gusts as high as 60 mph near the foothills of Boulder and Larimer Counties. * RELATIVE HUMIDITY...As low as 16 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire.
Summary
Maximum discharge along the river is currently at the reporting a streamflow rate of cfs. This is also the highest stage along the Grand Calumet River, with a gauge stage of ft at this location. This river is monitored from 1 different streamgauging stations along the Grand Calumet River, the highest being situated at an altitude of ft, the .
15-Day Weather Outlook
River Streamflow Levels
| Streamgauge | Streamflow | Gauge Stage | 24hr Change (%) | % Normal | Minimum (cfs) | Maximum (cfs) | Air Temp | Elevation |
|---|---|---|---|---|---|---|---|---|
|
Grand Calumet River At Industrial Hwy At Gary
USGS 04092677 |
593 cfs | 1.46 ft | 37.59 |
Seasonal Discharge Comparison
Maximum Streamflow Discharge
Streamflow Elevation Profile
The river has a long history of industrial pollution, which has led to its designation as one of the most polluted rivers in America. The hydrology of the river has been significantly altered by the construction of dams and reservoirs along its length, including the highly controversial Indiana Harbor and Ship Canal. These structures have been built in an effort to control the flow of the river, reduce flooding, and provide water for industrial and agricultural use. Despite its environmental challenges, the Grand Calumet River has some recreational uses, including fishing and boating. The river also supports some agriculture in the surrounding area, though the pollution levels in the river are a concern for farmers.