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Crescent Lake algae history from satellite

We read Crescent Lake from 398 cloud-free satellite scenes between Feb 14, 2016 – Oct 1, 2026. Here is what the surface water showed.

Clear scenes
398
Typical (median), index
21
Highest reading
382 · Dec 8, 2025
Latest scene
74 · Oct 1, 2026

Algae signal (red-edge index) over time

01002003004002017201820192020202120222023202420252026Feb 14, 2016: 16 index (low)Apr 14, 2016: 48 index (low)May 14, 2016: 56 index (low)Jun 23, 2016: 111 index (high)Jul 13, 2016: 104 index (high)Aug 2, 2016: 91 index (high)Aug 22, 2016: 71 index (high)Sep 11, 2016: 50 index (low)Oct 1, 2016: 64 index (high)Oct 21, 2016: 37 index (low)Nov 10, 2016: 34 index (low)Nov 20, 2016: 37 index (low)Mar 30, 2017: 63 index (low)Apr 19, 2017: 89 index (low)May 9, 2017: 52 index (high)May 29, 2017: 71 index (low)Jun 18, 2017: 86 index (low)Jul 28, 2017: 96 index (low)Aug 12, 2017: 67 index (low)Aug 17, 2017: 62 index (high)Sep 26, 2017: 7.5 index (low)Oct 31, 2017: -2.5 index (low)Nov 20, 2017: -0.5 index (low)Nov 25, 2017: 3 index (low)Nov 30, 2017: -0.5 index (low)Dec 10, 2017: -3 index (low)Dec 20, 2017: 3.3 index (low)Jan 4, 2018: -0.5 index (low)Jan 9, 2018: 4.5 index (low)Jan 19, 2018: -1.5 index (low)Jan 24, 2018: 2 index (low)Feb 23, 2018: 12 index (low)Feb 28, 2018: 6.5 index (low)Mar 5, 2018: 5.5 index (low)Mar 15, 2018: 6 index (low)Apr 4, 2018: 13 index (low)Apr 14, 2018: 26 index (low)Apr 19, 2018: 22 index (low)Apr 24, 2018: 31 index (low)Apr 29, 2018: 15 index (low)May 9, 2018: 18 index (low)May 29, 2018: 53 index (low)Jun 13, 2018: 22 index (low)Jun 18, 2018: 38 index (low)Jun 23, 2018: 56 index (low)Jun 28, 2018: 50 index (low)Jul 13, 2018: 19 index (low)Jul 18, 2018: 32 index (low)Jul 28, 2018: 21 index (low)Aug 7, 2018: 11 index (low)Aug 17, 2018: 22 index (low)Aug 27, 2018: 13 index (low)Sep 1, 2018: 27 index (low)Sep 6, 2018: 18 index (low)Sep 11, 2018: 9.5 index (low)Sep 16, 2018: 17 index (low)Sep 21, 2018: 13 index (low)Sep 26, 2018: 8 index (low)Oct 16, 2018: 4.5 index (low)Oct 21, 2018: 5.5 index (low)Oct 31, 2018: 3 index (low)Dec 5, 2018: -2 index (low)Jan 24, 2019: 11 index (low)Jan 29, 2019: 1.5 index (low)Feb 8, 2019: 6.5 index (low)Feb 18, 2019: 11 index (low)Feb 23, 2019: 8.5 index (low)Feb 28, 2019: 8 index (low)Mar 10, 2019: 10 index (low)Mar 15, 2019: 8.5 index (low)Mar 25, 2019: 13 index (low)Apr 4, 2019: 15 index (low)Apr 24, 2019: 5 index (low)Apr 29, 2019: 33 index (low)May 4, 2019: 32 index (low)May 14, 2019: 30 index (low)May 19, 2019: 21 index (low)May 24, 2019: 25 index (low)May 29, 2019: 28 index (low)Jun 3, 2019: 38 index (low)Jun 23, 2019: 77 index (low)Jun 28, 2019: 74 index (low)Jul 3, 2019: 52 index (high)Jul 8, 2019: 81 index (low)Jul 23, 2019: 79 index (high)Jul 28, 2019: 80 index (low)Aug 12, 2019: 47 index (low)Aug 22, 2019: 82 index (high)Aug 27, 2019: 106 index (high)Sep 6, 2019: 70 index (high)Sep 11, 2019: 61 index (low)Sep 16, 2019: 90 index (low)Sep 21, 2019: 58 index (low)Oct 1, 2019: 51 index (low)Oct 11, 2019: 52 index (high)Oct 26, 2019: 61 index (high)Nov 10, 2019: 34 index (low)Nov 20, 2019: 17 index (low)Nov 25, 2019: 22 index (low)Nov 30, 2019: 19 index (low)Dec 5, 2019: 18 index (low)Dec 10, 2019: 20 index (low)Dec 15, 2019: 15 index (low)Jan 9, 2020: 14 index (low)Feb 3, 2020: 17 index (low)Feb 8, 2020: 23 index (low)Feb 13, 2020: 31 index (low)Feb 18, 2020: 22 index (low)Feb 23, 2020: 34 index (low)Feb 28, 2020: 27 index (low)Mar 9, 2020: 36 index (low)Mar 14, 2020: 58 index (high)Mar 19, 2020: 70 index (high)Mar 24, 2020: 66 index (high)Mar 29, 2020: 66 index (high)Apr 3, 2020: 67 index (high)Apr 28, 2020: 48 index (low)May 3, 2020: 45 index (low)May 8, 2020: 60 index (low)May 13, 2020: 86 index (low)Jun 17, 2020: 62 index (low)Jun 22, 2020: 136 index (high)Jul 2, 2020: 171 index (low)Jul 12, 2020: 137 index (high)Jul 17, 2020: 170 index (high)Jul 27, 2020: 151 index (high)Aug 1, 2020: 162 index (high)Aug 11, 2020: 218 index (high)Aug 26, 2020: 199 index (high)Aug 31, 2020: 116 index (high)Sep 5, 2020: 112 index (high)Sep 10, 2020: 102 index (high)Oct 10, 2020: 35 index (low)Oct 15, 2020: 9 index (low)Oct 25, 2020: 8 index (low)Oct 30, 2020: 4 index (low)Nov 4, 2020: 9 index (low)Nov 14, 2020: 7.5 index (low)Nov 24, 2020: 0 index (low)Dec 9, 2020: -1 index (low)Dec 14, 2020: 6.5 index (low)Dec 19, 2020: 9.5 index (low)Dec 29, 2020: 0 index (low)Jan 18, 2021: 1.5 index (low)Jan 28, 2021: 5.5 index (low)Feb 2, 2021: 8 index (low)Feb 7, 2021: 18 index (low)Feb 12, 2021: 15 index (low)Feb 22, 2021: 11 index (low)Feb 27, 2021: 11 index (low)Mar 4, 2021: 10 index (low)Mar 9, 2021: 12 index (low)Mar 14, 2021: 8 index (low)Mar 19, 2021: 11 index (low)Mar 24, 2021: 11 index (low)Apr 3, 2021: 17 index (low)Apr 8, 2021: 10 index (low)Apr 13, 2021: 5 index (low)Apr 23, 2021: 23 index (low)Apr 28, 2021: 33 index (low)May 3, 2021: 40 index (low)May 8, 2021: 5.5 index (low)May 18, 2021: 52 index (low)May 23, 2021: 14 index (low)May 28, 2021: 14 index (low)Jun 12, 2021: 64 index (low)Jun 22, 2021: 59 index (low)Jun 27, 2021: 71 index (low)Jul 2, 2021: 55 index (low)Jul 17, 2021: 24 index (low)Jul 22, 2021: 47 index (low)Jul 27, 2021: 39 index (low)Aug 6, 2021: 32 index (low)Aug 21, 2021: 14 index (low)Aug 31, 2021: 37 index (low)Sep 10, 2021: 17 index (low)Sep 25, 2021: 12 index (low)Sep 30, 2021: 17 index (low)Oct 10, 2021: 15 index (low)Nov 9, 2021: 13 index (low)Nov 14, 2021: 7 index (low)Nov 24, 2021: 13 index (low)Nov 29, 2021: 4 index (low)Dec 4, 2021: 25 index (low)Dec 24, 2021: 2.5 index (low)Dec 29, 2021: 1.5 index (low)Jan 3, 2022: 6.5 index (low)Jan 8, 2022: 5 index (low)Jan 13, 2022: 8.5 index (low)Jan 18, 2022: 6.5 index (low)Feb 17, 2022: 20 index (low)Feb 22, 2022: 15 index (low)Feb 27, 2022: 9 index (low)Mar 4, 2022: 9.3 index (low)Mar 9, 2022: 28 index (low)Mar 29, 2022: 11 index (low)Apr 3, 2022: 20 index (low)Apr 8, 2022: 22 index (low)Apr 28, 2022: 33 index (low)May 8, 2022: 16 index (low)May 13, 2022: 31 index (low)May 18, 2022: 30 index (low)May 23, 2022: 82 index (low)May 28, 2022: 28 index (low)Jun 2, 2022: 28 index (low)Jun 7, 2022: 27 index (low)Jun 12, 2022: 82 index (low)Jun 17, 2022: 44 index (low)Jun 22, 2022: 56 index (low)Jul 12, 2022: 82 index (low)Jul 17, 2022: 74 index (high)Jul 22, 2022: 57 index (high)Jul 27, 2022: 83 index (low)Aug 1, 2022: 61 index (high)Aug 16, 2022: 90 index (low)Aug 26, 2022: 74 index (high)Aug 31, 2022: 72 index (high)Sep 20, 2022: 51 index (high)Sep 25, 2022: 36 index (low)Sep 30, 2022: 57 index (high)Oct 5, 2022: 23 index (low)Oct 10, 2022: 12 index (low)Oct 15, 2022: 5.3 index (low)Oct 20, 2022: 6 index (low)Oct 25, 2022: 1.8 index (low)Nov 4, 2022: 6 index (low)Nov 29, 2022: -1.5 index (low)Dec 4, 2022: 8.5 index (low)Dec 9, 2022: 5 index (low)Dec 19, 2022: -1.5 index (low)Dec 24, 2022: -4 index (low)Dec 29, 2022: 0 index (low)Jan 3, 2023: 2.5 index (low)Jan 8, 2023: -1 index (low)Jan 23, 2023: 5 index (low)Jan 28, 2023: 9 index (low)Feb 7, 2023: 1 index (low)Feb 17, 2023: 9.5 index (low)Feb 22, 2023: 8.5 index (low)Feb 27, 2023: 5.5 index (low)Mar 9, 2023: 7.8 index (low)Mar 14, 2023: 11 index (low)Mar 19, 2023: 10 index (low)Mar 24, 2023: 12 index (low)Apr 8, 2023: 18 index (low)Apr 13, 2023: 21 index (low)Apr 18, 2023: 8 index (low)May 3, 2023: 18 index (low)May 8, 2023: 17 index (low)May 13, 2023: 34 index (low)May 18, 2023: 37 index (low)May 28, 2023: 32 index (low)Jun 7, 2023: 70 index (low)Jun 27, 2023: 83 index (low)Jul 2, 2023: 26 index (low)Jul 7, 2023: 92 index (low)Jul 12, 2023: 53 index (high)Jul 22, 2023: 76 index (low)Aug 1, 2023: 40 index (low)Aug 6, 2023: 54 index (low)Aug 11, 2023: 36 index (low)Aug 21, 2023: 69 index (low)Aug 26, 2023: 37 index (low)Aug 31, 2023: 40 index (low)Sep 10, 2023: 29 index (low)Sep 15, 2023: 39 index (low)Sep 20, 2023: 34 index (low)Oct 5, 2023: 32 index (low)Oct 10, 2023: -4 index (low)Oct 15, 2023: 15 index (low)Oct 20, 2023: 9 index (low)Oct 25, 2023: 12 index (low)Oct 30, 2023: 7.5 index (low)Nov 9, 2023: 7 index (low)Nov 19, 2023: 0 index (low)Nov 29, 2023: -2.5 index (low)Dec 9, 2023: 5 index (low)Dec 19, 2023: 0 index (low)Jan 28, 2024: 6.5 index (low)Feb 2, 2024: 5.5 index (low)Feb 7, 2024: 8.5 index (low)Feb 12, 2024: 8.5 index (low)Feb 22, 2024: 3.5 index (low)Feb 27, 2024: 6.5 index (low)Mar 3, 2024: 12 index (low)Mar 23, 2024: 20 index (low)Apr 7, 2024: 12 index (low)Apr 12, 2024: 24 index (low)Apr 22, 2024: 37 index (low)Apr 27, 2024: 59 index (low)May 7, 2024: 40 index (low)May 22, 2024: 69 index (low)May 27, 2024: 51 index (low)Jun 6, 2024: 64 index (low)Jun 26, 2024: 77 index (low)Jul 1, 2024: 79 index (low)Jul 6, 2024: 56 index (low)Jul 16, 2024: 72 index (high)Jul 21, 2024: 66 index (high)Aug 10, 2024: 80 index (low)Aug 20, 2024: 76 index (low)Aug 25, 2024: 56 index (high)Sep 24, 2024: 32 index (low)Oct 14, 2024: 18 index (low)Oct 24, 2024: 5 index (low)Nov 3, 2024: 7 index (low)Nov 13, 2024: 9.5 index (low)Nov 18, 2024: 6 index (low)Nov 23, 2024: -2.5 index (low)Dec 3, 2024: 0.5 index (low)Dec 13, 2024: 4.5 index (low)Dec 18, 2024: 14 index (low)Dec 28, 2024: 21 index (low)Jan 12, 2025: -3 index (low)Jan 17, 2025: -0.5 index (low)Jan 27, 2025: 2 index (low)Feb 1, 2025: 4 index (low)Feb 6, 2025: 4 index (low)Feb 21, 2025: 3.5 index (low)Feb 26, 2025: 5 index (low)Mar 3, 2025: 6 index (low)Mar 13, 2025: 7 index (low)Mar 18, 2025: 2 index (low)Apr 2, 2025: 22 index (low)Apr 7, 2025: 15 index (low)Apr 12, 2025: 18 index (low)Apr 17, 2025: 2.5 index (low)May 7, 2025: 36 index (low)May 9, 2025: 46 index (low)May 17, 2025: 37 index (low)May 22, 2025: 38 index (low)Jun 1, 2025: 29 index (low)Jun 6, 2025: 65 index (low)Jun 11, 2025: 63 index (low)Jun 16, 2025: 38 index (low)Jun 18, 2025: 65 index (low)Jun 21, 2025: 34 index (low)Jun 26, 2025: 39 index (low)Jul 1, 2025: 62 index (low)Jul 21, 2025: 56 index (low)Jul 26, 2025: 38 index (low)Jul 28, 2025: 41 index (low)Aug 5, 2025: 30 index (low)Aug 15, 2025: 28 index (low)Aug 25, 2025: 31 index (low)Sep 4, 2025: 25 index (low)Sep 6, 2025: 35 index (low)Sep 14, 2025: 19 index (low)Sep 19, 2025: 19 index (low)Sep 24, 2025: 9.5 index (low)Sep 26, 2025: 13 index (low)Oct 14, 2025: 3 index (low)Oct 16, 2025: 8 index (low)Oct 19, 2025: 8 index (low)Oct 24, 2025: 2 index (low)Nov 3, 2025: 2 index (low)Nov 5, 2025: 7 index (low)Nov 13, 2025: 5.5 index (low)Nov 18, 2025: 5.5 index (low)Nov 23, 2025: 3 index (low)Nov 28, 2025: 0 index (low)Dec 3, 2025: 4 index (low)Dec 8, 2025: 382 index (low)Dec 13, 2025: 1.5 index (low)Dec 15, 2025: 5 index (low)Dec 23, 2025: 2.5 index (low)Jan 7, 2026: 4 index (low)Jan 17, 2026: 4.5 index (low)Jan 27, 2026: 2.5 index (low)Feb 1, 2026: 9.5 index (low)Feb 6, 2026: 10 index (low)Feb 21, 2026: 9.5 index (low)Mar 8, 2026: 15 index (low)Mar 18, 2026: 13 index (low)Mar 28, 2026: 15 index (low)Apr 2, 2026: 16 index (low)Apr 4, 2026: 18 index (low)Apr 12, 2026: 18 index (low)Apr 17, 2026: 20 index (low)Apr 24, 2026: 29 index (low)May 7, 2026: 43 index (low)May 14, 2026: 58 index (low)May 22, 2026: 37 index (low)Jun 6, 2026: 55 index (low)Jun 11, 2026: 42 index (low)Jun 16, 2026: 74 index (low)Jun 21, 2026: 57 index (low)Jun 26, 2026: 61 index (low)Jul 6, 2026: 93 index (low)Jul 11, 2026: 85 index (low)Jul 16, 2026: 117 index (low)Jul 21, 2026: 71 index (low)Aug 15, 2026: 52 index (low)Aug 22, 2026: 50 index (low)Aug 30, 2026: 36 index (low)Sep 11, 2026: 46 index (low)Sep 14, 2026: 59 index (high)Oct 1, 2026: 74 index (high)
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
Jan244.250%
Feb379.50%
Mar311113%
Apr36203%
May38373%
Jun35616%
Jul377230%
Aug365536%
Sep323019%
Oct328.513%
Nov3160%
Dec2940%

By year (median / highest): 2016: 53 / 111 (12 scenes) · 2017: 52 / 96 (15 scenes) · 2018: 13 / 56 (35 scenes) · 2019: 30 / 106 (41 scenes) · 2020: 46 / 218 (40 scenes) · 2021: 14 / 71 (43 scenes) · 2022: 22 / 90 (46 scenes) · 2023: 16 / 92 (46 scenes) · 2024: 20 / 80 (35 scenes) · 2025: 13 / 382 (53 scenes) · 2026: 39 / 117 (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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