Lake Hartwell Water Temperature & Level Today
Live surface water temp (68.9°F), pool elevation (658.68 ft MSL), dam outflow, and 30-day hydrological history.
What Today's Conditions (68.9°F • 658.7 ft) Mean
Boat Ramps & Navigation
At 658.7 ft MSL, main public concrete ramps remain fully functional with sufficient trailer draft. Boaters should exercise standard vigilance around shallow sandbars when straying outside marked navigation channels.
Private Docks & Shorelines
Water line is situated 1.3 ft below normal conservation pool. Floating docks and gangways are operating at optimal gangway slope without mud grounding.
Water Temperature & Recreation
Surface water temperature of 68.9°F provides brisk recreational conditions ideal for fishing and boating; early-season swimmers may prefer a shorty wetsuit. Safety status is currently rated CLEAR.
Spaceborne Satellite Observation & Water Clarity
Fresh multi-spectral overhead Earth observation from the European Space Agency (ESA) Sentinel-2 constellation (10m spatial resolution).
Satellite imagery and indices processed via Copernicus Data Space Ecosystem (CDSE) / Sentinel Hub API. Data reflects actual surface conditions at the time of orbital passage.
Derived from Band 4 red reflectance across open water pixels. Low reflectance indicates minimal suspended silt and high underwater visibility for angling and navigation.
Normalized Difference Chlorophyll Index (NDCI: -0.063) measures phytoplankton concentration using Red-Edge (B05) and Red (B04) bands to detect early bloom development before surface scums appear.
Normalized Difference Water Index (NDWI) contrasts Green and Near-Infrared spectra to map shallow shoals, sandbars, and exposed islands (like Sometimes Island on Travis or Wood Island on Texoma).
Reservoir Pool Benchmarks & Historical Records
| Pool Benchmark | Elevation (ft MSL) | Difference from Current | Notes / Historical Significance |
|---|---|---|---|
| Current Level (Today) | 658.68 ft | — | Live observation from USACE Savannah District |
| Normal Conservation Pool | 660.00 ft | -1.32 ft | Target design storage pool for recreation & water supply |
| Flood Control Pool (Top of Gates) | 665.00 ft | 6.32 ft remaining capacity | Water above this stage triggers emergency spillway discharge |
| Record Historical High | 665.40 ft | 6.72 ft above current | Recorded on 1964-04-08 |
| Record Historical Low | 637.49 ft | 21.19 ft above record | Recorded on 2008-12-09 |
30-Day Daily Water Level History
Official daily snapshots from USACE Savannah District
| Date | Elevation (ft MSL) | Daily Change | Inflow (cfs) | Release / Outflow (cfs) | Water Temp |
|---|---|---|---|---|---|
| 2026-09-18 | 658.68 ft | -0.01 ft | 880 | 967 | 76.6°F |
| 2026-09-17 | 658.69 ft | +0.01 ft | 810 | 909 | 76.5°F |
| 2026-09-16 | 658.68 ft | -0.02 ft | 864 | 844 | 76.1°F |
| 2026-09-15 | 658.70 ft | -0.03 ft | 734 | 944 | 76.1°F |
| 2026-09-14 | 658.73 ft | -0.01 ft | 704 | 890 | 76.5°F |
| 2026-09-13 | 658.74 ft | +0.02 ft | 925 | 894 | 76.4°F |
| 2026-09-12 | 658.72 ft | +0.02 ft | 788 | 891 | 75.5°F |
| 2026-09-11 | 658.70 ft | -0.03 ft | 834 | 919 | 74.8°F |
| 2026-09-10 | 658.73 ft | -0.07 ft | 692 | 906 | 75.3°F |
| 2026-09-09 | 658.80 ft | -0.05 ft | 789 | 845 | 76.4°F |
| 2026-09-08 | 658.85 ft | +0.01 ft | 931 | 974 | 76.9°F |
| 2026-09-07 | 658.84 ft | +0.01 ft | 748 | 871 | 76.5°F |
| 2026-09-06 | 658.83 ft | -0.01 ft | 807 | 840 | 75.9°F |
| 2026-09-05 | 658.84 ft | -0.03 ft | 693 | 1,017 | 76°F |
| 2026-09-04 | 658.87 ft | 0.00 ft | 876 | 814 | 76.3°F |
| 2026-09-03 | 658.87 ft | +0.02 ft | 888 | 880 | 75.9°F |
| 2026-09-02 | 658.85 ft | -0.01 ft | 710 | 1,016 | 75.2°F |
| 2026-09-01 | 658.86 ft | -0.06 ft | 800 | 774 | 75°F |
| 2026-08-31 | 658.92 ft | -0.06 ft | 729 | 938 | 75.9°F |
| 2026-08-30 | 658.98 ft | -0.02 ft | 931 | 972 | 76.9°F |
| 2026-08-29 | 659.00 ft | +0.03 ft | 808 | 780 | 77°F |
| 2026-08-28 | 658.97 ft | +0.01 ft | 698 | 973 | 76.2°F |
| 2026-08-27 | 658.96 ft | -0.03 ft | 817 | 916 | 75.6°F |
| 2026-08-26 | 658.99 ft | -0.02 ft | 776 | 826 | 75.8°F |
| 2026-08-25 | 659.01 ft | 0.00 ft | 938 | 962 | 76.1°F |
| 2026-08-24 | 659.01 ft | +0.01 ft | 720 | 886 | 75.7°F |
| 2026-08-23 | 659.00 ft | -0.03 ft | 727 | 880 | 75.2°F |
| 2026-08-22 | 659.03 ft | -0.07 ft | 845 | 913 | 75.5°F |
| 2026-08-21 | 659.10 ft | -0.04 ft | 811 | 903 | 76.6°F |
| 2026-08-20 | 659.14 ft | +0.01 ft | 899 | 904 | 77.2°F |
| 2026-08-19 | 659.13 ft | — | 658 | 862 | 76.7°F |
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