Red Flag Warning
2026-03-05T18:00:00-07:00

The National Weather Service in Denver has issued a Red Flag Warning for wind and low relative humidity, which is in effect from noon to 6 PM MST Thursday. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Fire Weather Zones 241, 246 and 247. * TIMING...From noon to 6 PM MST Thursday. * WINDS...South 10 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...10 to 15 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.


Hillsborough River River Levels

Last Updated: March 4, 2026

The Hillsborough River is a 54-mile long river in western Florida that flows from the Green Swamp to Hillsborough Bay in Tampa.


Summary

Total streamflow across the Hillsborough River was last observed at 256 cfs, and is expected to yield approximately 507 acre-ft of water today; about 45% of normal. River levels are low and may signify a drought. Average streamflow for this time of year is 563 cfs, with recent peaks last observed on 2017-09-15 when daily discharge volume was observed at 16,270 cfs.

Maximum discharge along the river is currently at the Hillsborough R At Morris Br Near Thonotosassa Fl reporting a streamflow rate of 89.3 cfs. However, the streamgauge with the highest stage along the river is the Hillsborough R Ab Crystal Spr Near Zephyrhills Fl with a gauge stage of 52.14 ft. This river is monitored from 5 different streamgauging stations along the Hillsborough River, the highest being situated at an altitude of 118 ft, the Hillsborough R Ab Crystal Spr Near Zephyrhills Fl.




15-Day Weather Outlook


River Details

Last Updated 2026-03-04
Discharge Volume 507 ACRE-FT
Streamflow 255.8 cfs
-6.2 cfs (-2.37%)
Percent of Normal 45.45%
Maximum 16,270.0 cfs
2017-09-15
Seasonal Avg 563 cfs
       
River Streamflow Levels
Streamgauge Streamflow Gauge Stage 24hr Change (%) % Normal Minimum (cfs) Maximum (cfs) Air Temp Elevation
Hillsborough R Ab Crystal Spr Near Zephyrhills Fl
USGS 02301990
19 cfs 52.14 ft -1.6
Hillsborough R Bl Crystal Spr Near Zephyrhills Fl
USGS 02302010
61 cfs 49.41 ft -0.65
Hillsborough River Near Zephyrhills Fl
USGS 02303000
87 cfs 1.08 ft -1.24
Hillsborough R At Morris Br Near Thonotosassa Fl
USGS 02303330
89 cfs 24.3 ft -4.7
Hillsborough River Near Tampa Fl
USGS 02304500
0 cfs 21.56 ft None
Seasonal Discharge Comparison
Maximum Streamflow Discharge
Streamflow Elevation Profile

The Hillsborough River is a river located in the state of Florida in the United States. It arises in the Green Swamp near the juncture of Hillsborough, Pasco and Polk counties, and flows 60 miles (97 km) through Pasco and Hillsborough Counties to an outlet in the city of Tampa on Tampa Bay. It includes 4 nature trails extending for over seven miles, making it perfect for hikers. The name Hillsborough River first appeared on a British map in 1769. At the time, the Earl of Hillsborough was the British Secretary of State for the Colonies, and thus controlled the pensions of the surveyors working in the American colonies, which included East Florida.