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Crooked Lake algae history from satellite

We read Crooked Lake from 393 cloud-free satellite scenes between Feb 14, 2016 – Sep 24, 2026. Here is what the surface water showed.

Clear scenes
393
Typical (median), index
19
Highest reading
94 · Jun 12, 2022
Latest scene
44 · Sep 24, 2026

Algae signal (red-edge index) over time

0501002017201820192020202120222023202420252026Feb 14, 2016: 8 index (low)Apr 14, 2016: 27 index (low)May 14, 2016: 66 index (low)Jun 23, 2016: 20 index (low)Jul 13, 2016: 25 index (low)Aug 2, 2016: 31 index (low)Aug 22, 2016: 16 index (low)Sep 11, 2016: 22 index (low)Oct 1, 2016: 19 index (low)Oct 21, 2016: 17 index (low)Nov 10, 2016: 12 index (low)Nov 20, 2016: 11 index (low)Nov 30, 2016: 11 index (low)Dec 30, 2016: 5 index (low)Feb 8, 2017: 15 index (low)Mar 10, 2017: 7.5 index (low)Mar 30, 2017: 20 index (low)Apr 19, 2017: 32 index (low)May 9, 2017: 48 index (low)May 29, 2017: 44 index (low)Jun 18, 2017: 30 index (low)Aug 12, 2017: 28 index (low)Aug 17, 2017: 15 index (low)Sep 21, 2017: 16 index (low)Sep 26, 2017: 14 index (low)Oct 16, 2017: 15 index (low)Nov 20, 2017: 8 index (low)Nov 25, 2017: 8 index (low)Nov 30, 2017: 13 index (low)Dec 10, 2017: 2 index (low)Dec 15, 2017: 6.5 index (low)Dec 20, 2017: 11 index (low)Dec 30, 2017: 7.5 index (low)Jan 4, 2018: 4 index (low)Jan 24, 2018: 9 index (low)Feb 18, 2018: 5 index (low)Feb 23, 2018: 14 index (low)Mar 5, 2018: 6.5 index (low)Mar 15, 2018: 4.5 index (low)Mar 25, 2018: 14 index (low)Mar 30, 2018: 19 index (low)Apr 4, 2018: 13 index (low)Apr 14, 2018: 39 index (low)Apr 19, 2018: 19 index (low)Apr 24, 2018: 43 index (low)May 4, 2018: 43 index (low)May 9, 2018: 33 index (low)May 24, 2018: 52 index (low)Jun 3, 2018: 89 index (low)Jun 8, 2018: 33 index (low)Jun 13, 2018: 15 index (low)Jun 18, 2018: 47 index (low)Jun 23, 2018: 88 index (low)Jun 28, 2018: 73 index (low)Jul 3, 2018: 20 index (low)Jul 13, 2018: 37 index (low)Jul 18, 2018: 54 index (low)Jul 28, 2018: 19 index (low)Aug 2, 2018: 57 index (low)Aug 7, 2018: 47 index (low)Aug 12, 2018: 27 index (low)Aug 17, 2018: 41 index (low)Aug 22, 2018: 15 index (low)Aug 27, 2018: 32 index (low)Sep 1, 2018: 33 index (low)Sep 6, 2018: 29 index (low)Sep 16, 2018: 20 index (low)Sep 21, 2018: 19 index (low)Sep 26, 2018: 18 index (low)Oct 6, 2018: 17 index (low)Oct 16, 2018: 14 index (low)Oct 21, 2018: 14 index (low)Oct 26, 2018: 19 index (low)Oct 31, 2018: 8 index (low)Nov 5, 2018: 9 index (low)Nov 10, 2018: 10 index (low)Nov 25, 2018: 10 index (low)Nov 30, 2018: 6.5 index (low)Dec 5, 2018: 2.5 index (low)Dec 25, 2018: 2.5 index (low)Jan 4, 2019: 5.5 index (low)Jan 14, 2019: 2.5 index (low)Jan 19, 2019: 6 index (low)Jan 29, 2019: 0.5 index (low)Feb 3, 2019: 12 index (low)Feb 8, 2019: 5.5 index (low)Feb 23, 2019: 16 index (low)Mar 10, 2019: 12 index (low)Mar 15, 2019: 14 index (low)Mar 25, 2019: 7 index (low)Apr 4, 2019: 26 index (low)Apr 9, 2019: 50 index (low)Apr 24, 2019: 9 index (low)Apr 29, 2019: 43 index (low)May 9, 2019: 86 index (low)May 19, 2019: 26 index (low)May 24, 2019: 50 index (low)May 29, 2019: 59 index (low)Jun 3, 2019: 50 index (low)Jun 23, 2019: 57 index (low)Jun 28, 2019: 81 index (low)Jul 3, 2019: 26 index (low)Jul 23, 2019: 51 index (low)Jul 28, 2019: 22 index (low)Aug 2, 2019: 29 index (low)Aug 22, 2019: 21 index (low)Aug 27, 2019: 21 index (low)Sep 11, 2019: 23 index (low)Sep 16, 2019: 30 index (low)Sep 21, 2019: 29 index (low)Sep 26, 2019: 8 index (low)Oct 1, 2019: 21 index (low)Oct 11, 2019: 18 index (low)Oct 16, 2019: 17 index (low)Oct 21, 2019: 17 index (low)Oct 26, 2019: 22 index (low)Nov 10, 2019: 13 index (low)Nov 20, 2019: 9.5 index (low)Nov 30, 2019: 10 index (low)Dec 10, 2019: 12 index (low)Dec 15, 2019: 2.5 index (low)Dec 20, 2019: 8 index (low)Dec 25, 2019: 15 index (low)Jan 14, 2020: 39 index (low)Jan 24, 2020: 7 index (low)Jan 29, 2020: 9 index (low)Feb 3, 2020: 4.5 index (low)Feb 8, 2020: 14 index (low)Feb 23, 2020: 12 index (low)Feb 28, 2020: 10 index (low)Mar 4, 2020: 11 index (low)Mar 14, 2020: 13 index (low)Mar 19, 2020: 17 index (low)Mar 24, 2020: 13 index (low)Mar 29, 2020: 17 index (low)Apr 3, 2020: 8 index (low)Apr 8, 2020: 18 index (low)May 3, 2020: 22 index (low)May 8, 2020: 37 index (low)May 13, 2020: 52 index (low)Jun 17, 2020: 19 index (low)Jun 22, 2020: 16 index (low)Jul 2, 2020: 57 index (low)Jul 12, 2020: 86 index (low)Jul 17, 2020: 66 index (low)Jul 27, 2020: 22 index (low)Aug 11, 2020: 16 index (low)Sep 5, 2020: 15 index (low)Sep 10, 2020: 26 index (low)Sep 25, 2020: 17 index (low)Oct 15, 2020: 14 index (low)Oct 25, 2020: 14 index (low)Oct 30, 2020: 11 index (low)Nov 4, 2020: 17 index (low)Nov 14, 2020: 16 index (low)Nov 24, 2020: 9 index (low)Nov 29, 2020: 6.5 index (low)Dec 9, 2020: 7.5 index (low)Dec 19, 2020: 8 index (low)Dec 29, 2020: 6 index (low)Jan 28, 2021: 3 index (low)Feb 2, 2021: 6 index (low)Feb 22, 2021: 15 index (low)Feb 27, 2021: 13 index (low)Mar 9, 2021: 15 index (low)Mar 14, 2021: 9 index (low)Mar 19, 2021: 20 index (low)Mar 24, 2021: 10 index (low)Apr 3, 2021: 23 index (low)Apr 8, 2021: 7 index (low)Apr 13, 2021: 17 index (low)Apr 18, 2021: 53 index (low)Apr 28, 2021: 51 index (low)May 3, 2021: 42 index (low)May 8, 2021: 41 index (low)May 23, 2021: 53 index (low)May 28, 2021: 20 index (low)Jun 2, 2021: 55 index (low)Jun 22, 2021: 30 index (low)Jul 17, 2021: 25 index (low)Jul 22, 2021: 23 index (low)Jul 27, 2021: 39 index (low)Aug 1, 2021: 47 index (low)Aug 6, 2021: 43 index (low)Aug 21, 2021: 21 index (low)Sep 10, 2021: 21 index (low)Sep 15, 2021: 24 index (low)Sep 20, 2021: 20 index (low)Sep 25, 2021: 13 index (low)Sep 30, 2021: 15 index (low)Oct 10, 2021: 16 index (low)Oct 15, 2021: 14 index (low)Oct 20, 2021: 13 index (low)Oct 30, 2021: 13 index (low)Nov 9, 2021: 8.5 index (low)Nov 14, 2021: 2.5 index (low)Nov 19, 2021: 7 index (low)Nov 24, 2021: 9 index (low)Nov 29, 2021: 7.5 index (low)Dec 4, 2021: 6.5 index (low)Dec 9, 2021: 30 index (low)Dec 14, 2021: 26 index (low)Dec 24, 2021: 7.5 index (low)Dec 29, 2021: 5 index (low)Jan 3, 2022: 6.5 index (low)Jan 8, 2022: 5 index (low)Jan 13, 2022: 5.5 index (low)Jan 18, 2022: 0.5 index (low)Feb 2, 2022: 7 index (low)Feb 7, 2022: 11 index (low)Feb 12, 2022: 8 index (low)Mar 4, 2022: 8.5 index (low)Mar 29, 2022: 5 index (low)Apr 8, 2022: 21 index (low)May 8, 2022: 57 index (low)May 13, 2022: 25 index (low)May 18, 2022: 37 index (low)May 23, 2022: 80 index (low)Jun 2, 2022: 88 index (low)Jun 7, 2022: 49 index (low)Jun 12, 2022: 94 index (low)Jun 17, 2022: 71 index (low)Jun 22, 2022: 55 index (low)Jul 7, 2022: 46 index (low)Jul 12, 2022: 61 index (low)Jul 22, 2022: 54 index (low)Jul 27, 2022: 64 index (low)Aug 1, 2022: 38 index (low)Aug 6, 2022: 69 index (low)Aug 16, 2022: 36 index (low)Aug 21, 2022: 36 index (low)Sep 20, 2022: 21 index (low)Sep 25, 2022: 26 index (low)Sep 30, 2022: 21 index (low)Oct 5, 2022: 18 index (low)Oct 25, 2022: 11 index (low)Oct 30, 2022: 11 index (low)Nov 4, 2022: 8.5 index (low)Nov 14, 2022: 15 index (low)Nov 19, 2022: 12 index (low)Nov 29, 2022: 7 index (low)Dec 4, 2022: 9 index (low)Dec 9, 2022: 11 index (low)Dec 14, 2022: 13 index (low)Dec 29, 2022: 4.5 index (low)Jan 18, 2023: 9.5 index (low)Jan 23, 2023: 10 index (low)Feb 7, 2023: 7.5 index (low)Feb 17, 2023: 13 index (low)Feb 22, 2023: 15 index (low)Feb 27, 2023: 7 index (low)Mar 4, 2023: 16 index (low)Mar 9, 2023: 13 index (low)Mar 14, 2023: 12 index (low)Mar 24, 2023: 13 index (low)Mar 29, 2023: 30 index (low)Apr 8, 2023: 24 index (low)Apr 18, 2023: 18 index (low)May 3, 2023: 41 index (low)May 8, 2023: 39 index (low)May 13, 2023: 53 index (low)May 18, 2023: 32 index (low)May 23, 2023: 31 index (low)Jun 2, 2023: 87 index (low)Jun 7, 2023: 75 index (low)Jun 27, 2023: 78 index (low)Jul 2, 2023: 23 index (low)Jul 12, 2023: 41 index (low)Jul 22, 2023: 67 index (low)Aug 1, 2023: 31 index (low)Aug 6, 2023: 33 index (low)Aug 11, 2023: 24 index (low)Aug 26, 2023: 26 index (low)Sep 10, 2023: 17 index (low)Sep 15, 2023: 20 index (low)Sep 20, 2023: 20 index (low)Sep 25, 2023: 23 index (low)Oct 5, 2023: 23 index (low)Oct 15, 2023: 23 index (low)Oct 30, 2023: 23 index (low)Nov 4, 2023: 19 index (low)Nov 9, 2023: 12 index (low)Nov 19, 2023: 11 index (low)Nov 29, 2023: 8 index (low)Dec 19, 2023: 5.5 index (low)Dec 29, 2023: 14 index (low)Feb 2, 2024: 8 index (low)Feb 7, 2024: 12 index (low)Feb 12, 2024: 15 index (low)Feb 22, 2024: 8.5 index (low)Feb 27, 2024: 15 index (low)Mar 23, 2024: 43 index (low)Apr 12, 2024: 30 index (low)Apr 17, 2024: 28 index (low)May 2, 2024: 45 index (low)May 7, 2024: 26 index (low)May 22, 2024: 69 index (low)May 27, 2024: 55 index (low)Jun 6, 2024: 27 index (low)Jun 16, 2024: 45 index (low)Jun 21, 2024: 23 index (low)Jul 16, 2024: 26 index (low)Jul 26, 2024: 39 index (low)Aug 20, 2024: 51 index (low)Oct 14, 2024: 18 index (low)Oct 24, 2024: 13 index (low)Oct 29, 2024: 21 index (low)Nov 3, 2024: 21 index (low)Nov 8, 2024: 20 index (low)Nov 13, 2024: 22 index (low)Nov 18, 2024: 13 index (low)Nov 23, 2024: 8 index (low)Nov 28, 2024: 7 index (low)Dec 3, 2024: 7.5 index (low)Dec 8, 2024: 10 index (low)Dec 13, 2024: 12 index (low)Dec 23, 2024: 11 index (low)Jan 12, 2025: 6.5 index (low)Feb 6, 2025: 3.5 index (low)Feb 21, 2025: 6 index (low)Feb 26, 2025: 8.5 index (low)Mar 3, 2025: 11 index (low)Mar 8, 2025: 11 index (low)Mar 13, 2025: 10 index (low)Mar 18, 2025: 4 index (low)Apr 2, 2025: 34 index (low)Apr 12, 2025: 25 index (low)Apr 17, 2025: 15 index (low)Apr 27, 2025: 11 index (low)May 2, 2025: 31 index (low)May 7, 2025: 36 index (low)May 9, 2025: 45 index (low)May 17, 2025: 31 index (low)Jun 1, 2025: 48 index (low)Jun 6, 2025: 52 index (low)Jun 11, 2025: 57 index (low)Jun 16, 2025: 35 index (low)Jun 21, 2025: 30 index (low)Jul 1, 2025: 61 index (low)Jul 16, 2025: 63 index (low)Jul 21, 2025: 49 index (low)Jul 26, 2025: 32 index (low)Jul 28, 2025: 24 index (low)Aug 5, 2025: 21 index (low)Aug 17, 2025: 17 index (low)Aug 20, 2025: 57 index (low)Aug 30, 2025: 30 index (low)Sep 14, 2025: 14 index (low)Sep 24, 2025: 11 index (low)Sep 26, 2025: 23 index (low)Sep 29, 2025: 37 index (low)Oct 14, 2025: 13 index (low)Oct 19, 2025: 19 index (low)Oct 24, 2025: 14 index (low)Nov 3, 2025: 14 index (low)Nov 5, 2025: 22 index (low)Nov 8, 2025: 11 index (low)Nov 13, 2025: 8 index (low)Nov 18, 2025: 13 index (low)Nov 23, 2025: 8.5 index (low)Nov 28, 2025: 8.5 index (low)Dec 28, 2025: 11 index (low)Jan 7, 2026: 32 index (low)Jan 17, 2026: 8.5 index (low)Jan 27, 2026: 5 index (low)Feb 1, 2026: 7 index (low)Feb 6, 2026: 7 index (low)Feb 21, 2026: 6 index (low)Mar 8, 2026: 21 index (low)Mar 28, 2026: 16 index (low)Apr 12, 2026: 21 index (low)Apr 17, 2026: 16 index (low)Apr 24, 2026: 49 index (low)May 7, 2026: 36 index (low)May 17, 2026: 71 index (low)Jun 1, 2026: 49 index (low)Jun 16, 2026: 71 index (low)Jun 21, 2026: 14 index (low)Jun 23, 2026: 25 index (low)Jun 26, 2026: 33 index (low)Jul 6, 2026: 38 index (low)Jul 11, 2026: 35 index (low)Jul 16, 2026: 61 index (low)Jul 21, 2026: 51 index (low)Jul 26, 2026: 70 index (low)Aug 15, 2026: 28 index (low)Aug 20, 2026: 21 index (low)Aug 22, 2026: 38 index (low)Aug 30, 2026: 29 index (low)Sep 9, 2026: 34 index (low)Sep 11, 2026: 63 index (low)Sep 19, 2026: 19 index (low)Sep 24, 2026: 44 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
Jan206.250%
Feb328.50%
Mar32130%
Apr29240%
May36430%
Jun36490%
Jul34400%
Aug34290%
Sep35210%
Oct32160%
Nov43100%
Dec307.750%

By year (median / highest): 2016: 18 / 66 (14 scenes) · 2017: 15 / 48 (19 scenes) · 2018: 19 / 89 (47 scenes) · 2019: 18 / 86 (43 scenes) · 2020: 15 / 86 (37 scenes) · 2021: 16 / 55 (44 scenes) · 2022: 21 / 94 (41 scenes) · 2023: 23 / 87 (41 scenes) · 2024: 21 / 69 (31 scenes) · 2025: 19 / 63 (45 scenes) · 2026: 32 / 71 (31 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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