HILLSBOROUGH R BL HANNAHS WHIRL NR SULPHUR SPGS FL
USGS 02304517 · Florida · reports water temperature, dissolved oxygen, specific conductance
Reading HILLSBOROUGH R BL HANNAHS WHIRL NR SULPHUR SPGS FL…
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USGS 02304517 · Florida · reports water temperature, dissolved oxygen, specific conductance
What the agencies suggest
Fish early in the morning while the water temperature is coolerNational Park Service
Play and land fish quickly to reduce exhaustion stressNational Park Service
General guidance from the readings and the published lines named above, not a fishing forecast. Local rules and closures come first.
Reading Nov 5, 8:30 PM EST · provisional USGS data
No flow at this gauge. USGS does not publish discharge here, so there are no flow statistics either; it reports what is shown. Flow on the same river: HILLSBOROUGH RIVER AT ROWLETT PK DR NEAR TAMPA FL (USGS 02304510, 0.7 miles away).
Water temperature, last 7 days: 169 readings from Oct 29, 9:30 PM EDT to Nov 5, 8:30 PM EST; ranging 74.7 to 78.6 °F; latest 78.4 °F.
USGS provisional data may be revised. Source: USGS instantaneous values.
| Time | Water temperature (°F) |
|---|---|
| Nov 5, 8:30 PM EST | 78.4 |
| Nov 5, 7:30 PM EST | 78.4 |
| Nov 5, 6:30 PM EST | 78.6 |
| Nov 5, 5:30 PM EST | 78.4 |
| Nov 5, 4:30 PM EST | 78.1 |
| Nov 5, 3:30 PM EST | 77.7 |
| Nov 5, 2:30 PM EST | 77.4 |
| Nov 5, 1:30 PM EST | 76.5 |
| Nov 5, 12:30 PM EST | 76.3 |
| Nov 5, 11:30 AM EST | 76.3 |
| Nov 5, 10:30 AM EST | 76.3 |
| Nov 5, 9:30 AM EST | 76.3 |
| Nov 5, 8:30 AM EST | 76.1 |
| Nov 5, 7:30 AM EST | 76.3 |
| Nov 5, 6:30 AM EST | 76.3 |
| Nov 5, 5:30 AM EST | 76.3 |
| Nov 5, 4:30 AM EST | 76.3 |
| Nov 5, 3:30 AM EST | 76.5 |
| Nov 5, 2:30 AM EST | 76.8 |
| Nov 5, 1:30 AM EST | 77.4 |
| Nov 5, 12:30 AM EST | 77.5 |
| Nov 4, 11:30 PM EST | 77.7 |
| Nov 4, 10:30 PM EST | 77.5 |
| Nov 4, 9:30 PM EST | 77.5 |
| Nov 4, 8:30 PM EST | 77.4 |
| Nov 4, 7:30 PM EST | 77.4 |
| Nov 4, 6:30 PM EST | 77.4 |
| Nov 4, 5:30 PM EST | 77.4 |
| Nov 4, 4:30 PM EST | 77.2 |
| Nov 4, 3:30 PM EST | 77 |
| Nov 4, 2:30 PM EST | 76.6 |
| Nov 4, 1:30 PM EST | 76.5 |
| Nov 4, 12:30 PM EST | 76.3 |
| Nov 4, 11:30 AM EST | 75.9 |
| Nov 4, 10:30 AM EST | 75.9 |
| Nov 4, 9:30 AM EST | 75.9 |
| Nov 4, 8:30 AM EST | 75.9 |
| Nov 4, 7:30 AM EST | 75.9 |
| Nov 4, 6:30 AM EST | 76.1 |
| Nov 4, 5:30 AM EST | 76.1 |
| Nov 4, 4:30 AM EST | 76.3 |
| Nov 4, 3:30 AM EST | 76.1 |
| Nov 4, 2:30 AM EST | 75.7 |
| Nov 4, 1:30 AM EST | 75.7 |
| Nov 4, 12:30 AM EST | 75.7 |
| Nov 3, 11:30 PM EST | 75.9 |
| Nov 3, 10:30 PM EST | 75.9 |
| Nov 3, 9:30 PM EST | 75.7 |
| Nov 3, 8:30 PM EST | 75.7 |
| Nov 3, 7:30 PM EST | 75.7 |
| Nov 3, 6:30 PM EST | 75.9 |
| Nov 3, 5:30 PM EST | 76.1 |
| Nov 3, 4:30 PM EST | 75.9 |
| Nov 3, 3:30 PM EST | 75.7 |
| Nov 3, 2:30 PM EST | 75.6 |
| Nov 3, 1:30 PM EST | 75.2 |
| Nov 3, 12:30 PM EST | 75 |
| Nov 3, 11:30 AM EST | 74.8 |
| Nov 3, 10:30 AM EST | 74.7 |
| Nov 3, 9:30 AM EST | 74.7 |
| Nov 3, 8:30 AM EST | 74.7 |
| Nov 3, 7:30 AM EST | 74.8 |
| Nov 3, 6:30 AM EST | 74.8 |
| Nov 3, 5:30 AM EST | 74.8 |
| Nov 3, 4:30 AM EST | 74.8 |
| Nov 3, 3:30 AM EST | 74.8 |
| Nov 3, 2:30 AM EST | 74.8 |
| Nov 3, 1:30 AM EST | 74.8 |
| Nov 3, 12:30 AM EST | 75 |
| Nov 2, 11:30 PM EST | 75 |
| Nov 2, 10:30 PM EST | 75.2 |
| Nov 2, 9:30 PM EST | 75.2 |
| Nov 2, 8:30 PM EST | 75.4 |
| Nov 2, 7:30 PM EST | 75.4 |
| Nov 2, 6:30 PM EST | 75.4 |
| Nov 2, 5:30 PM EST | 75.4 |
| Nov 2, 4:30 PM EST | 75.6 |
| Nov 2, 3:30 PM EST | 75.6 |
| Nov 2, 2:30 PM EST | 75.4 |
| Nov 2, 1:30 PM EST | 75.4 |
| Nov 2, 12:30 PM EST | 75.2 |
| Nov 2, 11:30 AM EST | 75.2 |
| Nov 2, 10:30 AM EST | 75 |
| Nov 2, 9:30 AM EST | 74.8 |
| Nov 2, 8:30 AM EST | 75 |
| Nov 2, 7:30 AM EST | 75.2 |
| Nov 2, 6:30 AM EST | 75.6 |
| Nov 2, 5:30 AM EST | 75.7 |
| Nov 2, 4:30 AM EST | 75.7 |
| Nov 2, 3:30 AM EST | 75.7 |
| Nov 2, 2:30 AM EST | 75.9 |
| Nov 2, 1:30 AM EST | 75.9 |
| Nov 2, 12:30 AM EST | 75.9 |
| Nov 1, 11:30 PM EST | 76.1 |
| Nov 1, 10:30 PM EST | 76.1 |
| Nov 1, 9:30 PM EST | 76.1 |
| Nov 1, 8:30 PM EST | 76.1 |
| Nov 1, 7:30 PM EST | 76.3 |
| Nov 1, 6:30 PM EST | 76.3 |
| Nov 1, 5:30 PM EST | 76.3 |
| Nov 1, 4:30 PM EST | 76.3 |
| Nov 1, 3:30 PM EST | 76.5 |
| Nov 1, 2:30 PM EST | 76.6 |
| Nov 1, 1:30 PM EST | 76.6 |
| Nov 1, 12:30 PM EST | 76.5 |
| Nov 1, 11:30 AM EST | 76.3 |
| Nov 1, 10:30 AM EST | 76.3 |
| Nov 1, 9:30 AM EST | 76.1 |
| Nov 1, 8:30 AM EST | 76.1 |
| Nov 1, 7:30 AM EST | 76.1 |
| Nov 1, 6:30 AM EST | 76.1 |
| Nov 1, 5:30 AM EST | 76.1 |
| Nov 1, 4:30 AM EST | 76.3 |
| Nov 1, 3:30 AM EST | 76.3 |
| Nov 1, 2:30 AM EST | 76.3 |
| Nov 1, 1:30 AM EST | 76.3 |
| Nov 1, 1:30 AM EDT | 76.3 |
| Nov 1, 12:30 AM EDT | 76.3 |
| Oct 31, 11:30 PM EDT | 76.5 |
| Oct 31, 10:30 PM EDT | 76.5 |
| Oct 31, 9:30 PM EDT | 76.6 |
| Oct 31, 8:30 PM EDT | 76.6 |
| Oct 31, 7:30 PM EDT | 76.8 |
| Oct 31, 6:30 PM EDT | 76.6 |
| Oct 31, 5:30 PM EDT | 76.5 |
| Oct 31, 4:30 PM EDT | 76.3 |
| Oct 31, 3:30 PM EDT | 76.3 |
| Oct 31, 2:30 PM EDT | 76.3 |
| Oct 31, 1:30 PM EDT | 76.3 |
| Oct 31, 12:30 PM EDT | 76.3 |
| Oct 31, 11:30 AM EDT | 76.3 |
| Oct 31, 10:30 AM EDT | 76.3 |
| Oct 31, 9:30 AM EDT | 76.3 |
| Oct 31, 8:30 AM EDT | 76.3 |
| Oct 31, 7:30 AM EDT | 76.3 |
| Oct 31, 6:30 AM EDT | 76.3 |
| Oct 31, 5:30 AM EDT | 76.5 |
| Oct 31, 4:30 AM EDT | 76.6 |
| Oct 31, 3:30 AM EDT | 76.8 |
| Oct 31, 2:30 AM EDT | 76.8 |
| Oct 31, 1:30 AM EDT | 76.8 |
| Oct 31, 12:30 AM EDT | 76.8 |
| Oct 30, 11:30 PM EDT | 76.8 |
| Oct 30, 10:30 PM EDT | 76.8 |
| Oct 30, 9:30 PM EDT | 76.8 |
| Oct 30, 8:30 PM EDT | 77 |
| Oct 30, 7:30 PM EDT | 76.6 |
| Oct 30, 6:30 PM EDT | 76.5 |
| Oct 30, 5:30 PM EDT | 76.5 |
| Oct 30, 4:30 PM EDT | 75.9 |
| Oct 30, 3:30 PM EDT | 75.6 |
| Oct 30, 2:30 PM EDT | 75.6 |
| Oct 30, 1:30 PM EDT | 75.4 |
| Oct 30, 12:30 PM EDT | 75.2 |
| Oct 30, 11:30 AM EDT | 75.2 |
| Oct 30, 10:30 AM EDT | 75.2 |
| Oct 30, 9:30 AM EDT | 75.4 |
| Oct 30, 8:30 AM EDT | 75.2 |
| Oct 30, 7:30 AM EDT | 75.2 |
| Oct 30, 6:30 AM EDT | 75 |
| Oct 30, 5:30 AM EDT | 75 |
| Oct 30, 4:30 AM EDT | 75 |
| Oct 30, 3:30 AM EDT | 74.8 |
| Oct 30, 2:30 AM EDT | 74.8 |
| Oct 30, 1:30 AM EDT | 74.8 |
| Oct 30, 12:30 AM EDT | 74.7 |
| Oct 29, 11:30 PM EDT | 74.8 |
| Oct 29, 10:30 PM EDT | 74.8 |
| Oct 29, 9:30 PM EDT | 74.7 |
Map of USGS gauge 02304517 and the river around it
Where HILLSBOROUGH R BL HANNAHS WHIRL NR SULPHUR SPGS FL sits, with 8 other gauges on the same river.
Federal guidance. Florida Fish and Wildlife Conservation Commission publishes no water-temperature line for trout anglers that we found. The lines below are the National Park Service's, federal guidance, not a Florida rule:
Stressful for trout. Water 78.4°F now; the highest in the last 24 hours was 78.6°F. At 68°F the U.S. Fish and Wildlife Service says rainbow trout “start stressing”, and the National Park Service at Grand Teton recommends that anglers “cease fishing at 2 p.m. when water temperatures are likely to exceed 68°F.” Its advice: “Fish early in the morning while the water temperature is cooler”, “Play and land fish quickly to reduce exhaustion stress” and “Keep the fish in the water as much as possible.”
High water temperatures prompt fishing advisory in Grand Teton National Park (29 July 2022) (National Park Service) Up a climate-stressed creek (9 June 2023) (U.S. Fish and Wildlife Service)Species list not on file for this gauge. Check the Florida Fish and Wildlife Conservation Commission: Florida freshwater fishing sites and forecasts · Florida saltwater recreational fishing regulations.
Turn Around Don't Drown. “A mere 6 inches of fast-moving flood water can knock over an adult.” No flow number makes a crossing safe; if in doubt, stay out.
Turn Around Don't Drown (National Weather Service)Dissolved oxygen 6.9 mg/L at Nov 5, 8:30 PM EST; 7-day range 1.8–7.8 mg/L
Enough oxygen for coldwater fish: 6.9 mg/L meets the 6.5 mg/L EPA sets for coldwater fish (other life stages; eggs and fry need a 8 mg/L minimum).
Quality Criteria for Water 1986 (“Gold Book”): dissolved oxygen, Table 1; pH (U.S. Environmental Protection Agency)Specific conductance 301 µS/cm at Nov 5, 8:30 PM EST; 7-day range 261–14,100 µS/cm
Dissolved ions: Specific conductance rises with the ions dissolved in the water. No fishing threshold is published for it; compare with this gauge's own recent readings.
Conductivity (Electrical Conductance) and Water (U.S. Geological Survey)Guidance from the readings above and the published thresholds named with each line; not a fishing forecast, a safety guarantee or a statement about access. Local rules and closures come first.
The National Weather Service has no flood-stage gauge here, so no official flood category is shown.
Checked Nov 5, 8:56 PM EST; readings refresh at most every 15 minutes and statistics daily. Provisional USGS data can be revised. Conditions change: re-check before you go. This is general guidance, not a fishing forecast, a safety guarantee or a statement about access.