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Lake Jackson algae history from satellite

We read Lake Jackson from 367 cloud-free satellite scenes between Apr 27, 2016 – Sep 17, 2026. Here is what the surface water showed.

Clear scenes
367
Typical (median), index
81
Highest reading
549 · Apr 11, 2023
Latest scene
140 · Sep 17, 2026

Algae signal (red-edge index) over time

02004006002017201820192020202120222023202420252026Apr 27, 2016: 61 index (low)May 7, 2016: 23 index (low)May 27, 2016: 37 index (low)Jul 6, 2016: 36 index (low)Aug 15, 2016: 25 index (low)Sep 24, 2016: 43 index (low)Oct 14, 2016: 26 index (low)Nov 3, 2016: 27 index (low)Dec 23, 2016: 11 index (low)Jan 12, 2017: 6 index (low)Feb 1, 2017: 5.5 index (low)Mar 3, 2017: 6 index (low)Apr 12, 2017: 13 index (low)May 2, 2017: 38 index (low)Jul 1, 2017: 42 index (low)Jul 6, 2017: 48 index (low)Jul 21, 2017: 34 index (low)Jul 26, 2017: 65 index (high)Aug 10, 2017: 54 index (high)Aug 15, 2017: 65 index (low)Sep 4, 2017: 51 index (low)Sep 24, 2017: 49 index (low)Oct 9, 2017: 59 index (low)Oct 14, 2017: 49 index (low)Oct 29, 2017: 50 index (low)Nov 3, 2017: 50 index (low)Nov 13, 2017: 69 index (low)Nov 18, 2017: 43 index (low)Dec 13, 2017: 21 index (low)Jan 2, 2018: 74 index (high)Feb 6, 2018: 37 index (low)Feb 16, 2018: 25 index (low)Feb 26, 2018: 100 index (low)Mar 3, 2018: 30 index (low)Mar 8, 2018: 35 index (low)Mar 13, 2018: 40 index (low)Mar 23, 2018: 5.5 index (low)Mar 28, 2018: 46 index (low)Apr 2, 2018: 30 index (low)Apr 12, 2018: 37 index (low)Apr 17, 2018: 50 index (low)Apr 27, 2018: 136 index (low)May 2, 2018: 221 index (high)May 7, 2018: 259 index (high)May 12, 2018: 215 index (high)May 17, 2018: 309 index (high)Jun 1, 2018: 69 index (high)Jun 6, 2018: 66 index (high)Jun 16, 2018: 83 index (low)Jun 21, 2018: 82 index (low)Jun 26, 2018: 56 index (high)Jul 11, 2018: 43 index (low)Jul 26, 2018: 50 index (low)Aug 5, 2018: 42 index (low)Aug 20, 2018: 44 index (low)Aug 25, 2018: 63 index (low)Sep 9, 2018: 39 index (low)Sep 14, 2018: 44 index (low)Sep 19, 2018: 43 index (low)Sep 24, 2018: 47 index (low)Sep 29, 2018: 42 index (low)Oct 4, 2018: 42 index (low)Oct 14, 2018: 42 index (low)Oct 19, 2018: 23 index (low)Oct 24, 2018: 34 index (low)Oct 29, 2018: 42 index (low)Nov 3, 2018: 33 index (low)Nov 18, 2018: 29 index (low)Dec 18, 2018: 39 index (low)Dec 23, 2018: 31 index (low)Jan 7, 2019: 3.5 index (low)Jan 17, 2019: 41 index (low)Feb 21, 2019: 36 index (low)Mar 3, 2019: 80 index (low)Mar 8, 2019: 31 index (low)Mar 23, 2019: 12 index (low)Mar 28, 2019: 19 index (low)Apr 2, 2019: 20 index (low)Apr 22, 2019: 45 index (low)Apr 27, 2019: 81 index (high)May 7, 2019: 96 index (high)May 17, 2019: 74 index (low)May 22, 2019: 37 index (low)May 27, 2019: 37 index (low)Jun 1, 2019: 60 index (high)Jun 11, 2019: 81 index (high)Jun 16, 2019: 85 index (high)Jun 21, 2019: 113 index (low)Jul 1, 2019: 81 index (low)Jul 16, 2019: 66 index (low)Jul 21, 2019: 54 index (high)Aug 5, 2019: 52 index (high)Aug 10, 2019: 80 index (high)Aug 15, 2019: 74 index (high)Aug 30, 2019: 43 index (low)Sep 4, 2019: 78 index (high)Sep 9, 2019: 58 index (high)Sep 14, 2019: 53 index (low)Sep 19, 2019: 54 index (high)Sep 24, 2019: 33 index (low)Sep 29, 2019: 40 index (low)Oct 4, 2019: 25 index (low)Oct 9, 2019: 42 index (low)Oct 14, 2019: 23 index (low)Nov 3, 2019: 21 index (low)Nov 13, 2019: 45 index (low)Nov 18, 2019: 61 index (high)Nov 28, 2019: 54 index (high)Dec 3, 2019: 53 index (high)Dec 8, 2019: 58 index (high)Dec 18, 2019: 26 index (low)Jan 2, 2020: 25 index (low)Jan 17, 2020: 28 index (low)Jan 22, 2020: 34 index (low)Feb 21, 2020: 127 index (high)Mar 7, 2020: 149 index (high)Mar 27, 2020: 10 index (low)Apr 1, 2020: 76 index (low)Apr 6, 2020: 89 index (high)Apr 11, 2020: 120 index (high)Apr 16, 2020: 137 index (high)Apr 21, 2020: 164 index (high)Apr 26, 2020: 196 index (high)May 1, 2020: 160 index (high)May 6, 2020: 161 index (high)May 11, 2020: 151 index (high)May 16, 2020: 104 index (high)May 31, 2020: 85 index (high)Jun 10, 2020: 89 index (high)Jun 15, 2020: 76 index (high)Jun 20, 2020: 69 index (high)Jun 30, 2020: 115 index (high)Jul 10, 2020: 69 index (low)Jul 20, 2020: 38 index (low)Jul 30, 2020: 128 index (high)Aug 4, 2020: 142 index (high)Aug 9, 2020: 147 index (high)Sep 3, 2020: 131 index (high)Sep 8, 2020: 1 index (low)Sep 13, 2020: 44 index (low)Sep 18, 2020: 100 index (high)Sep 23, 2020: 59 index (high)Sep 28, 2020: 120 index (high)Oct 13, 2020: 133 index (high)Oct 18, 2020: 132 index (high)Oct 28, 2020: 131 index (high)Nov 2, 2020: 123 index (high)Nov 17, 2020: 104 index (high)Dec 2, 2020: 82 index (high)Dec 7, 2020: 89 index (high)Dec 22, 2020: 75 index (high)Dec 27, 2020: 70 index (high)Jan 6, 2021: 95 index (low)Jan 16, 2021: 82 index (high)Feb 20, 2021: 44 index (low)Mar 7, 2021: 38 index (low)Mar 12, 2021: 55 index (high)Mar 17, 2021: 41 index (low)Apr 1, 2021: 116 index (low)Apr 6, 2021: 88 index (high)Apr 21, 2021: 120 index (high)Apr 26, 2021: 104 index (high)May 21, 2021: 39 index (low)May 26, 2021: 108 index (high)May 31, 2021: 130 index (low)Jun 10, 2021: 148 index (high)Jun 15, 2021: 74 index (low)Jun 25, 2021: 130 index (high)Jul 25, 2021: 132 index (high)Jul 30, 2021: 210 index (high)Aug 14, 2021: 132 index (high)Aug 19, 2021: 168 index (high)Aug 24, 2021: 84 index (low)Sep 3, 2021: 90 index (low)Sep 23, 2021: 79 index (high)Sep 28, 2021: 98 index (high)Oct 13, 2021: 82 index (high)Oct 23, 2021: 81 index (high)Nov 2, 2021: 76 index (high)Nov 7, 2021: 91 index (high)Nov 12, 2021: 92 index (high)Nov 17, 2021: 99 index (high)Nov 27, 2021: 80 index (high)Dec 2, 2021: 98 index (high)Dec 22, 2021: 48 index (low)Jan 1, 2022: 59 index (high)Jan 6, 2022: 76 index (high)Jan 11, 2022: 69 index (high)Jan 16, 2022: 20 index (low)Jan 31, 2022: 81 index (high)Feb 5, 2022: 52 index (high)Feb 10, 2022: 74 index (high)Feb 20, 2022: 88 index (high)Feb 25, 2022: 96 index (high)Mar 2, 2022: 85 index (high)Mar 12, 2022: 102 index (low)Mar 17, 2022: 35 index (low)Mar 27, 2022: 81 index (high)Apr 1, 2022: 90 index (high)Apr 11, 2022: 158 index (high)Apr 21, 2022: 264 index (high)Apr 26, 2022: 395 index (high)May 11, 2022: 101 index (high)May 16, 2022: 91 index (high)May 31, 2022: 117 index (high)Jun 10, 2022: 22 index (low)Jul 5, 2022: 192 index (high)Jul 15, 2022: -508 index (low)Jul 25, 2022: 154 index (high)Jul 30, 2022: 150 index (high)Aug 4, 2022: 159 index (high)Aug 19, 2022: 96 index (high)Sep 13, 2022: 81 index (high)Sep 18, 2022: 131 index (high)Sep 23, 2022: 145 index (high)Oct 3, 2022: 139 index (high)Oct 8, 2022: 139 index (high)Oct 13, 2022: 149 index (high)Oct 18, 2022: 125 index (high)Oct 23, 2022: 133 index (high)Nov 7, 2022: 104 index (high)Nov 12, 2022: 62 index (high)Nov 22, 2022: 122 index (high)Dec 2, 2022: 100 index (high)Dec 7, 2022: 99 index (high)Dec 27, 2022: 92 index (high)Jan 6, 2023: 78 index (high)Jan 11, 2023: 39 index (low)Jan 16, 2023: 84 index (high)Jan 26, 2023: 72 index (high)Feb 20, 2023: 99 index (high)Mar 22, 2023: 433 index (high)Apr 1, 2023: 298 index (high)Apr 11, 2023: 549 index (high)Apr 21, 2023: 530 index (high)May 6, 2023: 108 index (high)May 16, 2023: 249 index (high)Jun 5, 2023: 177 index (high)Jun 10, 2023: 147 index (high)Jun 25, 2023: 110 index (high)Jun 30, 2023: 163 index (high)Jul 5, 2023: 247 index (high)Jul 20, 2023: 169 index (high)Jul 30, 2023: 219 index (high)Aug 9, 2023: 189 index (high)Aug 14, 2023: 162 index (high)Aug 19, 2023: 200 index (high)Sep 3, 2023: 156 index (high)Sep 18, 2023: 136 index (high)Oct 3, 2023: 189 index (high)Oct 8, 2023: 152 index (high)Oct 18, 2023: 159 index (high)Oct 23, 2023: 165 index (high)Oct 28, 2023: 31 index (low)Nov 2, 2023: 172 index (high)Nov 7, 2023: 150 index (high)Nov 17, 2023: 126 index (high)Dec 7, 2023: 57 index (high)Dec 22, 2023: 41 index (low)Jan 1, 2024: 47 index (low)Jan 6, 2024: 46 index (low)Jan 31, 2024: 37 index (low)Feb 5, 2024: 25 index (low)Feb 20, 2024: 41 index (low)Feb 25, 2024: 61 index (high)Mar 16, 2024: 98 index (high)Mar 21, 2024: 77 index (high)Mar 31, 2024: 168 index (high)Apr 5, 2024: 199 index (high)Apr 15, 2024: 158 index (high)Apr 25, 2024: 256 index (high)May 25, 2024: 64 index (low)May 30, 2024: 124 index (high)Jun 4, 2024: 56 index (high)Jun 9, 2024: 61 index (high)Jun 14, 2024: 83 index (high)Jul 4, 2024: 143 index (high)Jul 14, 2024: 102 index (high)Jul 19, 2024: 128 index (high)Jul 29, 2024: 169 index (high)Aug 3, 2024: 154 index (high)Aug 13, 2024: 141 index (high)Aug 23, 2024: 102 index (high)Aug 28, 2024: 87 index (high)Sep 2, 2024: 144 index (high)Sep 22, 2024: 92 index (high)Sep 27, 2024: 70 index (high)Oct 2, 2024: 100 index (high)Oct 7, 2024: 89 index (high)Oct 12, 2024: 84 index (high)Oct 17, 2024: 80 index (high)Oct 22, 2024: 126 index (high)Oct 27, 2024: 99 index (high)Nov 1, 2024: 141 index (high)Nov 16, 2024: 60 index (high)Nov 21, 2024: 68 index (high)Dec 1, 2024: 72 index (high)Dec 6, 2024: 71 index (high)Dec 16, 2024: 75 index (high)Dec 21, 2024: 65 index (high)Dec 31, 2024: 75 index (high)Jan 25, 2025: 15 index (low)Jan 30, 2025: 39 index (low)Feb 4, 2025: 43 index (low)Feb 14, 2025: 43 index (low)Mar 1, 2025: 32 index (low)Mar 6, 2025: 30 index (low)Mar 11, 2025: 31 index (low)Mar 21, 2025: 21 index (low)Mar 23, 2025: 33 index (low)Mar 26, 2025: 34 index (low)Apr 10, 2025: 183 index (high)Apr 12, 2025: 192 index (high)Apr 25, 2025: 149 index (high)May 5, 2025: 119 index (high)May 15, 2025: 120 index (high)May 20, 2025: 119 index (high)May 22, 2025: 113 index (high)May 30, 2025: 58 index (low)Jul 14, 2025: 99 index (high)Jul 29, 2025: 93 index (high)Aug 18, 2025: 46 index (low)Sep 2, 2025: 71 index (high)Sep 7, 2025: 51 index (low)Sep 12, 2025: 87 index (high)Sep 17, 2025: 82 index (high)Sep 19, 2025: 120 index (high)Sep 27, 2025: 84 index (high)Oct 2, 2025: 94 index (high)Oct 17, 2025: 85 index (high)Oct 22, 2025: 87 index (high)Nov 1, 2025: 83 index (high)Nov 11, 2025: 83 index (high)Nov 16, 2025: 114 index (high)Nov 18, 2025: 109 index (high)Dec 11, 2025: 86 index (high)Dec 16, 2025: 100 index (high)Dec 21, 2025: 85 index (high)Dec 26, 2025: 97 index (high)Dec 31, 2025: 83 index (high)Jan 10, 2026: 72 index (high)Jan 15, 2026: 72 index (high)Jan 20, 2026: 77 index (high)Feb 14, 2026: 24 index (low)Feb 24, 2026: 71 index (high)Mar 1, 2026: 69 index (high)Mar 11, 2026: 92 index (high)Mar 21, 2026: 89 index (high)Mar 26, 2026: 105 index (high)Mar 28, 2026: 96 index (high)Apr 10, 2026: 112 index (high)Apr 17, 2026: 118 index (high)May 5, 2026: 173 index (high)Jun 24, 2026: 129 index (high)Jun 29, 2026: 181 index (high)Jul 24, 2026: 229 index (high)Jul 29, 2026: 218 index (high)Aug 3, 2026: 228 index (high)Aug 5, 2026: 89 index (high)Aug 8, 2026: 207 index (high)Aug 13, 2026: 218 index (high)Aug 18, 2026: 174 index (high)Aug 23, 2026: 205 index (high)Sep 2, 2026: 47 index (low)Sep 7, 2026: 148 index (high)Sep 14, 2026: 142 index (high)Sep 17, 2026: 140 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
Jan265346%
Feb194442%
Mar344038%
Apr3412071%
May3211069%
Jun268381%
Jul3010063%
Aug3110274%
Sep417861%
Oct368664%
Nov308273%
Dec287375%

By year (median / highest): 2016: 27 / 61 (9 scenes) · 2017: 48 / 69 (20 scenes) · 2018: 43 / 309 (41 scenes) · 2019: 53 / 113 (41 scenes) · 2020: 104 / 196 (41 scenes) · 2021: 91 / 210 (33 scenes) · 2022: 99 / 395 (41 scenes) · 2023: 159 / 549 (33 scenes) · 2024: 85 / 256 (42 scenes) · 2025: 85 / 192 (39 scenes) · 2026: 118 / 229 (27 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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