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Doctors Lake algae history from satellite

We read Doctors Lake from 373 cloud-free satellite scenes between Feb 14, 2016 – Sep 19, 2026. Here is what the surface water showed.

Clear scenes
373
Typical (median), index
50
Highest reading
234 · Jul 16, 2024
Latest scene
60 · Sep 19, 2026

Algae signal (red-edge index) over time

01002003002017201820192020202120222023202420252026Feb 14, 2016: 30 index (low)May 14, 2016: 195 index (high)Jun 23, 2016: 199 index (high)Jul 13, 2016: 101 index (low)Aug 2, 2016: 114 index (high)Aug 22, 2016: 92 index (high)Sep 11, 2016: 48 index (low)Oct 1, 2016: 51 index (high)Oct 21, 2016: 35 index (low)Nov 10, 2016: 28 index (low)Nov 20, 2016: 27 index (low)Mar 30, 2017: 29 index (low)Apr 19, 2017: 55 index (low)May 9, 2017: 58 index (high)Jun 18, 2017: 108 index (high)Sep 21, 2017: 26 index (low)Sep 26, 2017: 21 index (low)Oct 16, 2017: 18 index (low)Oct 31, 2017: 7.5 index (low)Nov 20, 2017: 6.5 index (low)Nov 25, 2017: 6 index (low)Nov 30, 2017: 4.5 index (low)Dec 10, 2017: 2 index (low)Dec 20, 2017: 11 index (low)Jan 4, 2018: 6.5 index (low)Jan 19, 2018: 5 index (low)Jan 24, 2018: 5.5 index (low)Feb 18, 2018: 17 index (low)Feb 23, 2018: 17 index (low)Feb 28, 2018: 12 index (low)Mar 5, 2018: 9 index (low)Mar 15, 2018: 9.5 index (low)Apr 4, 2018: 20 index (low)Apr 14, 2018: 24 index (low)Apr 19, 2018: 30 index (low)Apr 24, 2018: 28 index (low)Apr 29, 2018: 17 index (low)May 4, 2018: 17 index (low)May 9, 2018: 23 index (low)May 19, 2018: 37 index (low)May 24, 2018: 46 index (low)May 29, 2018: 59 index (low)Jun 8, 2018: 53 index (low)Jun 13, 2018: 60 index (low)Jun 18, 2018: 139 index (high)Jun 23, 2018: 87 index (low)Jun 28, 2018: 80 index (low)Jul 28, 2018: 47 index (low)Aug 2, 2018: 59 index (low)Aug 7, 2018: 53 index (high)Aug 12, 2018: 62 index (low)Aug 17, 2018: 52 index (low)Aug 22, 2018: 56 index (high)Aug 27, 2018: 28 index (low)Sep 1, 2018: 57 index (low)Sep 11, 2018: 49 index (low)Sep 16, 2018: 63 index (high)Sep 26, 2018: 66 index (high)Oct 6, 2018: 64 index (high)Oct 11, 2018: 50 index (low)Oct 16, 2018: 58 index (high)Oct 21, 2018: 56 index (high)Oct 31, 2018: 50 index (low)Dec 5, 2018: 17 index (low)Dec 25, 2018: 26 index (low)Jan 9, 2019: 18 index (low)Jan 14, 2019: 20 index (low)Jan 24, 2019: 36 index (low)Jan 29, 2019: -2 index (low)Feb 8, 2019: 19 index (low)Feb 18, 2019: 24 index (low)Feb 28, 2019: 27 index (low)Mar 10, 2019: 26 index (low)Mar 15, 2019: 25 index (low)Mar 20, 2019: 33 index (low)Apr 4, 2019: 33 index (low)Apr 9, 2019: 39 index (low)Apr 29, 2019: 40 index (low)May 9, 2019: 71 index (low)May 14, 2019: 46 index (low)May 19, 2019: 64 index (low)May 24, 2019: 85 index (high)May 29, 2019: 129 index (high)Jun 3, 2019: 77 index (low)Jun 23, 2019: 123 index (high)Jul 3, 2019: 96 index (high)Jul 23, 2019: 90 index (high)Aug 12, 2019: 81 index (high)Aug 22, 2019: 70 index (high)Aug 27, 2019: 77 index (high)Sep 1, 2019: 125 index (low)Sep 6, 2019: 61 index (high)Sep 11, 2019: 56 index (low)Sep 16, 2019: 67 index (high)Sep 21, 2019: 69 index (low)Sep 26, 2019: 55 index (high)Oct 11, 2019: 67 index (high)Oct 16, 2019: 68 index (low)Oct 26, 2019: 48 index (low)Nov 10, 2019: 58 index (high)Nov 20, 2019: 58 index (high)Nov 25, 2019: 70 index (high)Nov 30, 2019: 69 index (high)Dec 5, 2019: 75 index (high)Dec 10, 2019: 73 index (high)Dec 15, 2019: 66 index (high)Dec 25, 2019: 63 index (high)Feb 3, 2020: 53 index (high)Feb 8, 2020: 70 index (high)Feb 28, 2020: 26 index (low)Mar 4, 2020: 60 index (low)Mar 14, 2020: 46 index (low)Mar 19, 2020: 54 index (high)Mar 24, 2020: 60 index (high)Mar 29, 2020: 54 index (high)Apr 3, 2020: 44 index (low)Apr 28, 2020: 93 index (high)May 3, 2020: 86 index (high)May 8, 2020: 81 index (low)May 13, 2020: 117 index (low)May 23, 2020: 86 index (high)Jun 17, 2020: 72 index (low)Jun 22, 2020: 72 index (low)Jul 2, 2020: 105 index (low)Jul 12, 2020: 62 index (low)Jul 17, 2020: 74 index (low)Aug 1, 2020: 92 index (high)Aug 16, 2020: 78 index (high)Aug 26, 2020: 82 index (high)Sep 5, 2020: 74 index (high)Sep 10, 2020: 84 index (high)Sep 25, 2020: 74 index (high)Sep 30, 2020: 65 index (high)Oct 5, 2020: -24.5 index (low)Oct 25, 2020: 73 index (high)Oct 30, 2020: 61 index (high)Nov 4, 2020: 63 index (high)Nov 14, 2020: 55 index (high)Nov 24, 2020: 52 index (high)Dec 9, 2020: 44 index (low)Dec 19, 2020: 57 index (low)Dec 29, 2020: 40 index (low)Jan 18, 2021: 25 index (low)Jan 28, 2021: 29 index (low)Feb 2, 2021: 39 index (low)Feb 7, 2021: 36 index (low)Feb 22, 2021: 29 index (low)Feb 27, 2021: 31 index (low)Mar 4, 2021: 25 index (low)Mar 9, 2021: 39 index (low)Mar 14, 2021: 29 index (low)Mar 19, 2021: 42 index (low)Apr 3, 2021: 41 index (low)Apr 8, 2021: 20 index (low)Apr 13, 2021: 37 index (low)Apr 23, 2021: 38 index (low)Apr 28, 2021: 63 index (low)May 3, 2021: 51 index (low)May 8, 2021: 48 index (low)May 18, 2021: 73 index (low)May 23, 2021: 52 index (low)May 28, 2021: 88 index (high)Jun 12, 2021: 121 index (low)Jun 27, 2021: 102 index (low)Jul 17, 2021: 61 index (high)Jul 22, 2021: 88 index (low)Jul 27, 2021: 85 index (high)Aug 11, 2021: 72 index (high)Aug 31, 2021: 81 index (high)Sep 10, 2021: 60 index (low)Sep 15, 2021: 36 index (low)Sep 25, 2021: 50 index (low)Oct 10, 2021: 63 index (high)Oct 15, 2021: 26 index (low)Oct 30, 2021: 56 index (high)Nov 9, 2021: 38 index (low)Nov 14, 2021: 24 index (low)Nov 24, 2021: 41 index (low)Nov 29, 2021: 37 index (low)Dec 24, 2021: 22 index (low)Dec 29, 2021: 33 index (low)Jan 3, 2022: 54 index (high)Jan 8, 2022: 44 index (low)Jan 13, 2022: 49 index (low)Jan 18, 2022: 52 index (high)Jan 23, 2022: 43 index (low)Feb 22, 2022: 34 index (low)Feb 27, 2022: 41 index (low)Mar 4, 2022: 40 index (low)Mar 9, 2022: 61 index (low)Mar 14, 2022: 61 index (low)Mar 29, 2022: 43 index (low)Apr 3, 2022: 47 index (low)Apr 8, 2022: 54 index (low)Apr 13, 2022: 55 index (low)Apr 23, 2022: 64 index (low)Apr 28, 2022: 58 index (low)May 3, 2022: 85 index (low)May 8, 2022: 83 index (high)May 13, 2022: 106 index (high)May 18, 2022: 73 index (high)May 28, 2022: 78 index (low)Jun 2, 2022: 49 index (low)Jun 7, 2022: 31 index (low)Jul 12, 2022: 165 index (high)Jul 17, 2022: 115 index (high)Jul 22, 2022: 110 index (high)Aug 16, 2022: 112 index (high)Aug 21, 2022: 89 index (high)Aug 31, 2022: 87 index (high)Sep 5, 2022: 77 index (high)Sep 10, 2022: 80 index (high)Sep 15, 2022: 86 index (high)Sep 25, 2022: 74 index (high)Oct 5, 2022: 66 index (high)Oct 10, 2022: 45 index (low)Oct 15, 2022: 48 index (low)Oct 20, 2022: 41 index (low)Oct 25, 2022: 40 index (low)Nov 4, 2022: 58 index (high)Nov 14, 2022: 33 index (low)Nov 29, 2022: 24 index (low)Dec 9, 2022: 22 index (low)Dec 19, 2022: 13 index (low)Dec 24, 2022: 10 index (low)Jan 8, 2023: 13 index (low)Jan 13, 2023: 20 index (low)Jan 23, 2023: 20 index (low)Jan 28, 2023: 17 index (low)Feb 7, 2023: 23 index (low)Feb 17, 2023: 33 index (low)Feb 22, 2023: 34 index (low)Mar 14, 2023: 29 index (low)Mar 24, 2023: 32 index (low)Mar 29, 2023: 52 index (low)Apr 13, 2023: 44 index (low)Apr 18, 2023: 28 index (low)Apr 23, 2023: 43 index (low)May 3, 2023: 44 index (low)May 8, 2023: 40 index (low)May 18, 2023: 53 index (low)Jun 2, 2023: 64 index (low)Jun 17, 2023: 56 index (low)Jun 27, 2023: 80 index (low)Jul 2, 2023: 52 index (low)Jul 17, 2023: 86 index (low)Aug 1, 2023: 82 index (high)Aug 6, 2023: 62 index (high)Aug 16, 2023: 55 index (low)Aug 21, 2023: 86 index (low)Aug 26, 2023: 66 index (high)Aug 31, 2023: 76 index (high)Sep 15, 2023: 87 index (high)Sep 20, 2023: 64 index (high)Oct 10, 2023: 58 index (high)Oct 15, 2023: 55 index (high)Oct 20, 2023: 41 index (low)Oct 30, 2023: 44 index (low)Nov 19, 2023: 29 index (low)Nov 29, 2023: 25 index (low)Dec 9, 2023: 28 index (low)Dec 19, 2023: 29 index (low)Dec 29, 2023: 19 index (low)Jan 28, 2024: 37 index (low)Feb 2, 2024: 22 index (low)Feb 7, 2024: 20 index (low)Feb 22, 2024: 24 index (low)Feb 27, 2024: 29 index (low)Apr 7, 2024: 36 index (low)Apr 12, 2024: 55 index (low)Apr 22, 2024: 53 index (low)May 2, 2024: 47 index (low)May 27, 2024: 93 index (low)Jun 6, 2024: 58 index (low)Jun 11, 2024: 71 index (low)Jun 26, 2024: 109 index (high)Jul 1, 2024: 127 index (low)Jul 16, 2024: 234 index (high)Jul 21, 2024: 141 index (high)Aug 15, 2024: 105 index (high)Aug 25, 2024: 67 index (high)Aug 30, 2024: 65 index (high)Sep 24, 2024: 30 index (low)Oct 14, 2024: 44 index (low)Oct 24, 2024: 39 index (low)Nov 3, 2024: 43 index (low)Nov 23, 2024: 18 index (low)Nov 28, 2024: 31 index (low)Dec 3, 2024: 23 index (low)Dec 13, 2024: 31 index (low)Dec 18, 2024: 27 index (low)Jan 2, 2025: 10 index (low)Jan 12, 2025: 12 index (low)Jan 17, 2025: 12 index (low)Jan 27, 2025: 16 index (low)Feb 1, 2025: 18 index (low)Feb 21, 2025: 28 index (low)Feb 26, 2025: 16 index (low)Mar 13, 2025: 25 index (low)Mar 18, 2025: 25 index (low)Mar 23, 2025: 28 index (low)Apr 2, 2025: 36 index (low)Apr 12, 2025: 38 index (low)Apr 17, 2025: 18 index (low)May 22, 2025: 36 index (low)May 27, 2025: 89 index (high)Jun 1, 2025: 69 index (low)Jun 6, 2025: 165 index (high)Jun 16, 2025: 79 index (high)Jun 18, 2025: 82 index (high)Jun 21, 2025: 63 index (high)Jul 1, 2025: 106 index (low)Jul 6, 2025: 53 index (high)Jul 16, 2025: 73 index (low)Jul 26, 2025: 101 index (high)Jul 28, 2025: 115 index (high)Jul 31, 2025: 147 index (high)Aug 5, 2025: 163 index (high)Aug 10, 2025: 117 index (high)Aug 15, 2025: 152 index (high)Aug 20, 2025: 119 index (high)Sep 4, 2025: 88 index (high)Sep 6, 2025: 107 index (high)Sep 14, 2025: 89 index (high)Sep 19, 2025: 97 index (high)Sep 24, 2025: 92 index (high)Sep 26, 2025: 106 index (high)Oct 14, 2025: 38 index (low)Oct 16, 2025: 44 index (low)Oct 24, 2025: 33 index (low)Oct 29, 2025: 38 index (low)Nov 3, 2025: 34 index (low)Nov 5, 2025: 39 index (low)Nov 13, 2025: 38 index (low)Nov 18, 2025: 39 index (low)Nov 23, 2025: 20 index (low)Nov 25, 2025: 38 index (low)Nov 28, 2025: 33 index (low)Dec 13, 2025: 19 index (low)Dec 15, 2025: 37 index (low)Dec 23, 2025: 29 index (low)Jan 17, 2026: 26 index (low)Jan 22, 2026: 23 index (low)Jan 27, 2026: 26 index (low)Feb 1, 2026: 29 index (low)Feb 6, 2026: 27 index (low)Feb 21, 2026: 33 index (low)Feb 26, 2026: 44 index (low)Mar 3, 2026: 34 index (low)Mar 8, 2026: 47 index (low)Mar 13, 2026: 54 index (high)Mar 15, 2026: 52 index (high)Mar 18, 2026: 34 index (low)Apr 2, 2026: 39 index (low)Apr 4, 2026: 41 index (low)Apr 12, 2026: 23 index (low)Apr 17, 2026: 27 index (low)Apr 24, 2026: 35 index (low)May 7, 2026: 30 index (low)May 14, 2026: 34 index (low)Jun 3, 2026: 65 index (low)Jun 6, 2026: 42 index (low)Jun 11, 2026: 44 index (low)Jun 21, 2026: 68 index (low)Jun 23, 2026: 99 index (low)Jun 26, 2026: 60 index (low)Jul 11, 2026: 59 index (low)Aug 15, 2026: 64 index (high)Aug 22, 2026: 64 index (low)Aug 30, 2026: 70 index (high)Sep 4, 2026: 69 index (high)Sep 14, 2026: 78 index (high)Sep 19, 2026: 60 index (low)
Algae signal (red-edge index), index. One dot per cloud-free scene; dates are local to the lake.

When it peaks

MonthClear scenesMedian, indexScenes rated high
Jan26208%
Feb30287%
Mar303617%
Apr35393%
May356431%
Jun327228%
Jul259652%
Aug357780%
Sep366864%
Oct334836%
Nov313726%
Dec252816%

By year (median / highest): 2016: 51 / 199 (11 scenes) · 2017: 18 / 108 (13 scenes) · 2018: 47 / 139 (41 scenes) · 2019: 63 / 129 (42 scenes) · 2020: 65 / 117 (35 scenes) · 2021: 41 / 121 (39 scenes) · 2022: 55 / 165 (44 scenes) · 2023: 44 / 87 (38 scenes) · 2024: 44 / 234 (28 scenes) · 2025: 38 / 165 (50 scenes) · 2026: 43 / 99 (32 scenes).

What a satellite can and can’t tell you

Satellites see only the surface layer, only on cloud-free days, and only away from the shoreline. They estimate algae; they do not measure toxins, and they can’t see what the lake bottom is doing. A clear reading is not a safety clearance.

For current conditions and health advisories, check the Florida DEP algal bloom page and the Florida Department of Health. If a person or pet may have been exposed to a bloom, call a doctor, a veterinarian, or Poison Help at 1-800-222-1222.

Source: Sentinel-2 MSI (ESA Copernicus), Red-edge cyanobacteria index (CI-cyano); a scene counts as a bloom when the index is above 50 and stays high relative to turbidity (bloom rule v1 (2026-10)). Snapshot exported Oct 9, 2026.

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