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Lake Istokpoga algae history from satellite

We read Lake Istokpoga from 434 cloud-free satellite scenes between Feb 14, 2016 – Sep 24, 2026. Here is what the surface water showed.

Clear scenes
434
Typical (median), index
86
Highest reading
264 · Jul 2, 2022
Latest scene
136 · Sep 24, 2026

Algae signal (red-edge index) over time

01002003002017201820192020202120222023202420252026Feb 14, 2016: 48 index (low)May 14, 2016: 121 index (high)Jun 23, 2016: 59 index (high)Jul 13, 2016: 71 index (high)Aug 2, 2016: 62 index (low)Aug 22, 2016: 75 index (high)Sep 11, 2016: 76 index (low)Oct 1, 2016: 51 index (high)Oct 21, 2016: 42 index (low)Nov 10, 2016: 35 index (low)Nov 20, 2016: 46 index (low)Nov 30, 2016: 55 index (low)Dec 30, 2016: 58 index (high)Feb 8, 2017: 95 index (high)Feb 18, 2017: 101 index (high)Mar 10, 2017: 86 index (high)Mar 30, 2017: 115 index (low)Apr 19, 2017: 121 index (low)May 9, 2017: 149 index (low)May 29, 2017: 196 index (low)Jun 18, 2017: 138 index (low)Aug 17, 2017: 81 index (high)Sep 21, 2017: 21 index (low)Sep 26, 2017: 15 index (low)Oct 16, 2017: 12 index (low)Nov 20, 2017: 16 index (low)Nov 25, 2017: 14 index (low)Nov 30, 2017: 17 index (low)Dec 10, 2017: 7.5 index (low)Dec 15, 2017: 18 index (low)Dec 20, 2017: 20 index (low)Dec 30, 2017: 25 index (low)Jan 4, 2018: 23 index (low)Jan 9, 2018: 48 index (low)Jan 24, 2018: 40 index (low)Feb 18, 2018: 27 index (low)Feb 23, 2018: 34 index (low)Feb 28, 2018: 27 index (low)Mar 5, 2018: 24 index (low)Mar 15, 2018: 24 index (low)Mar 20, 2018: 56 index (low)Mar 25, 2018: 35 index (low)Mar 30, 2018: 50 index (low)Apr 4, 2018: 37 index (low)Apr 9, 2018: 67 index (low)Apr 14, 2018: 72 index (low)Apr 19, 2018: 61 index (low)Apr 29, 2018: 65 index (high)May 4, 2018: 102 index (low)May 9, 2018: 102 index (low)Jun 3, 2018: 107 index (low)Jun 8, 2018: 89 index (high)Jun 13, 2018: 74 index (high)Jun 18, 2018: 91 index (high)Jun 23, 2018: 107 index (low)Jul 3, 2018: 86 index (low)Jul 23, 2018: 125 index (low)Jul 28, 2018: 71 index (high)Aug 2, 2018: 100 index (low)Aug 7, 2018: 117 index (low)Aug 12, 2018: 81 index (high)Aug 17, 2018: 66 index (low)Aug 22, 2018: 68 index (low)Aug 27, 2018: 67 index (high)Sep 1, 2018: 82 index (low)Sep 6, 2018: 57 index (low)Sep 11, 2018: 73 index (high)Sep 16, 2018: 61 index (high)Sep 21, 2018: 59 index (high)Sep 26, 2018: 52 index (high)Oct 6, 2018: 61 index (high)Oct 16, 2018: 65 index (high)Oct 21, 2018: 69 index (high)Oct 31, 2018: 73 index (high)Nov 5, 2018: 75 index (high)Nov 10, 2018: 77 index (high)Nov 20, 2018: 70 index (high)Nov 25, 2018: 64 index (high)Dec 5, 2018: 71 index (high)Dec 10, 2018: 89 index (high)Dec 25, 2018: 67 index (high)Dec 30, 2018: 65 index (high)Jan 4, 2019: 81 index (high)Jan 14, 2019: 72 index (high)Jan 19, 2019: 67 index (high)Jan 29, 2019: 87 index (high)Feb 3, 2019: 50 index (low)Feb 8, 2019: 71 index (high)Feb 18, 2019: 85 index (high)Feb 23, 2019: 106 index (high)Mar 10, 2019: 132 index (high)Mar 25, 2019: 104 index (high)Apr 24, 2019: 117 index (high)Apr 29, 2019: 156 index (low)May 4, 2019: 173 index (low)May 9, 2019: 180 index (low)May 19, 2019: 146 index (high)May 24, 2019: 186 index (low)May 29, 2019: 156 index (low)Jun 3, 2019: 150 index (high)Jun 8, 2019: 105 index (low)Jun 23, 2019: 118 index (high)Jul 23, 2019: 178 index (low)Jul 28, 2019: 134 index (high)Aug 22, 2019: 50 index (low)Aug 27, 2019: 39 index (low)Sep 1, 2019: 57 index (low)Sep 6, 2019: 58 index (low)Sep 11, 2019: 56 index (low)Sep 16, 2019: 67 index (low)Sep 21, 2019: 59 index (low)Sep 26, 2019: 43 index (low)Oct 1, 2019: 73 index (high)Oct 11, 2019: 77 index (high)Oct 16, 2019: 71 index (high)Oct 21, 2019: 72 index (high)Oct 26, 2019: 94 index (high)Nov 5, 2019: 81 index (high)Nov 10, 2019: 87 index (high)Nov 20, 2019: 74 index (high)Nov 25, 2019: 82 index (high)Nov 30, 2019: 69 index (high)Dec 10, 2019: 66 index (high)Dec 15, 2019: 85 index (high)Dec 25, 2019: 103 index (high)Jan 4, 2020: 98 index (high)Jan 9, 2020: 70 index (high)Jan 14, 2020: 93 index (low)Jan 29, 2020: 86 index (high)Feb 3, 2020: 81 index (high)Feb 13, 2020: 95 index (high)Feb 18, 2020: 90 index (high)Feb 23, 2020: 104 index (high)Feb 28, 2020: 93 index (high)Mar 4, 2020: 102 index (high)Mar 14, 2020: 104 index (high)Mar 19, 2020: 120 index (high)Mar 24, 2020: 118 index (high)Mar 29, 2020: 127 index (high)Apr 3, 2020: 130 index (high)Apr 8, 2020: 126 index (high)Apr 28, 2020: 136 index (low)May 3, 2020: 118 index (high)May 8, 2020: 163 index (low)May 13, 2020: 134 index (low)Jun 17, 2020: 110 index (high)Jun 22, 2020: 101 index (high)Jun 27, 2020: 164 index (low)Jul 2, 2020: 133 index (low)Jul 7, 2020: 156 index (low)Jul 27, 2020: 114 index (low)Aug 1, 2020: 141 index (low)Aug 11, 2020: 60 index (high)Aug 26, 2020: 94 index (low)Aug 31, 2020: 62 index (high)Sep 5, 2020: 51 index (low)Sep 25, 2020: 43 index (low)Oct 10, 2020: 42 index (low)Oct 15, 2020: 31 index (low)Oct 25, 2020: 29 index (low)Nov 4, 2020: 40 index (low)Nov 14, 2020: 36 index (low)Nov 19, 2020: 43 index (low)Nov 24, 2020: 36 index (low)Nov 29, 2020: 17 index (low)Dec 9, 2020: 34 index (low)Dec 19, 2020: 33 index (low)Dec 29, 2020: 41 index (low)Jan 23, 2021: 33 index (low)Jan 28, 2021: 46 index (low)Feb 2, 2021: 49 index (low)Feb 12, 2021: 52 index (high)Feb 22, 2021: 72 index (high)Feb 27, 2021: 67 index (high)Mar 9, 2021: 74 index (high)Mar 14, 2021: 72 index (high)Mar 19, 2021: 90 index (low)Mar 24, 2021: 77 index (high)Apr 3, 2021: 97 index (low)Apr 8, 2021: 79 index (high)Apr 13, 2021: 78 index (high)Apr 18, 2021: 114 index (low)Apr 23, 2021: 120 index (low)Apr 28, 2021: 137 index (low)May 3, 2021: 150 index (low)May 8, 2021: 139 index (low)May 18, 2021: 134 index (low)May 28, 2021: 174 index (low)Jun 2, 2021: 188 index (low)Jun 7, 2021: 153 index (low)Jun 27, 2021: 148 index (low)Jul 2, 2021: 257 index (low)Jul 12, 2021: 161 index (low)Jul 22, 2021: 129 index (high)Jul 27, 2021: 110 index (high)Aug 1, 2021: 152 index (low)Aug 6, 2021: 135 index (low)Aug 11, 2021: 76 index (high)Aug 21, 2021: 66 index (high)Aug 31, 2021: 92 index (low)Sep 10, 2021: 79 index (high)Sep 15, 2021: 76 index (high)Sep 20, 2021: 65 index (high)Sep 30, 2021: 30 index (low)Oct 5, 2021: 46 index (low)Oct 10, 2021: 24 index (low)Oct 15, 2021: 38 index (low)Oct 20, 2021: 37 index (low)Oct 30, 2021: 41 index (low)Nov 9, 2021: 53 index (high)Nov 24, 2021: 56 index (high)Nov 29, 2021: 39 index (low)Dec 4, 2021: 27 index (low)Dec 9, 2021: 42 index (low)Dec 14, 2021: 45 index (low)Dec 24, 2021: 55 index (high)Dec 29, 2021: 41 index (low)Jan 3, 2022: 54 index (high)Jan 8, 2022: 51 index (high)Jan 13, 2022: 30 index (low)Jan 18, 2022: 54 index (high)Feb 2, 2022: 67 index (high)Feb 12, 2022: 44 index (low)Feb 17, 2022: 69 index (high)Feb 27, 2022: 52 index (high)Mar 9, 2022: 86 index (high)Mar 19, 2022: 76 index (low)Mar 29, 2022: 74 index (high)Apr 13, 2022: 148 index (low)May 13, 2022: 158 index (low)May 18, 2022: 158 index (low)May 28, 2022: 250 index (low)Jun 7, 2022: 179 index (low)Jun 17, 2022: 218 index (low)Jun 27, 2022: 261 index (low)Jul 2, 2022: 264 index (low)Jul 7, 2022: 215 index (high)Jul 12, 2022: 242 index (low)Aug 1, 2022: 197 index (high)Aug 6, 2022: 261 index (low)Aug 16, 2022: 231 index (high)Aug 26, 2022: 239 index (high)Aug 31, 2022: 207 index (high)Sep 5, 2022: 176 index (high)Sep 10, 2022: 231 index (high)Sep 15, 2022: 226 index (high)Sep 20, 2022: 173 index (high)Sep 25, 2022: 130 index (high)Sep 30, 2022: 97 index (high)Oct 5, 2022: 52 index (high)Oct 15, 2022: 36 index (low)Oct 20, 2022: 30 index (low)Oct 25, 2022: 19 index (low)Oct 30, 2022: 27 index (low)Nov 4, 2022: 29 index (low)Nov 14, 2022: 40 index (low)Nov 29, 2022: 26 index (low)Dec 4, 2022: 26 index (low)Dec 9, 2022: 18 index (low)Dec 14, 2022: 20 index (low)Dec 19, 2022: 16 index (low)Dec 29, 2022: 26 index (low)Jan 8, 2023: 20 index (low)Jan 18, 2023: 23 index (low)Feb 7, 2023: 38 index (low)Feb 12, 2023: 50 index (low)Feb 17, 2023: 45 index (low)Feb 22, 2023: 40 index (low)Feb 27, 2023: 44 index (low)Mar 4, 2023: 65 index (low)Mar 9, 2023: 55 index (low)Mar 24, 2023: 59 index (low)Apr 8, 2023: 90 index (high)Apr 13, 2023: 112 index (low)Apr 18, 2023: 100 index (low)Apr 23, 2023: 127 index (low)May 3, 2023: 128 index (low)May 8, 2023: 130 index (low)May 13, 2023: 135 index (high)May 18, 2023: 141 index (high)May 23, 2023: 133 index (high)May 28, 2023: 149 index (high)Jun 2, 2023: 153 index (high)Jun 27, 2023: 220 index (low)Jul 2, 2023: 128 index (high)Jul 22, 2023: 162 index (low)Aug 1, 2023: 143 index (high)Aug 6, 2023: 114 index (high)Aug 11, 2023: 111 index (high)Aug 16, 2023: 155 index (low)Aug 21, 2023: 154 index (low)Aug 26, 2023: 118 index (high)Sep 5, 2023: 113 index (high)Sep 10, 2023: 97 index (high)Sep 15, 2023: 105 index (high)Sep 20, 2023: 102 index (high)Sep 25, 2023: 72 index (high)Oct 5, 2023: 43 index (low)Oct 15, 2023: 50 index (low)Oct 20, 2023: 28 index (low)Nov 4, 2023: 66 index (high)Nov 9, 2023: 32 index (low)Nov 19, 2023: 57 index (high)Nov 29, 2023: 63 index (high)Dec 9, 2023: 42 index (low)Dec 19, 2023: 65 index (high)Feb 2, 2024: 44 index (low)Feb 7, 2024: 68 index (high)Feb 12, 2024: 76 index (high)Feb 22, 2024: 56 index (high)Feb 27, 2024: 43 index (low)Mar 3, 2024: 47 index (low)Mar 8, 2024: 51 index (high)Mar 13, 2024: 61 index (high)Apr 12, 2024: 118 index (low)Apr 27, 2024: 149 index (low)May 2, 2024: 123 index (high)May 7, 2024: 126 index (high)May 12, 2024: 188 index (low)May 22, 2024: 142 index (high)May 27, 2024: 152 index (low)Jun 6, 2024: 208 index (low)Jun 21, 2024: 241 index (low)Jul 6, 2024: 175 index (high)Jul 16, 2024: 254 index (low)Jul 21, 2024: 181 index (high)Jul 26, 2024: 143 index (high)Jul 31, 2024: 169 index (high)Aug 10, 2024: 208 index (low)Aug 20, 2024: 149 index (low)Aug 25, 2024: 103 index (high)Sep 4, 2024: 114 index (high)Sep 9, 2024: 102 index (high)Sep 29, 2024: 113 index (high)Oct 4, 2024: 107 index (high)Oct 14, 2024: 71 index (high)Oct 24, 2024: 44 index (low)Oct 29, 2024: 48 index (low)Nov 8, 2024: 43 index (low)Nov 18, 2024: 35 index (low)Nov 23, 2024: 46 index (low)Nov 28, 2024: 26 index (low)Dec 3, 2024: 48 index (low)Dec 8, 2024: 60 index (high)Dec 13, 2024: 64 index (high)Dec 18, 2024: 50 index (low)Dec 23, 2024: 45 index (low)Jan 2, 2025: 59 index (high)Jan 12, 2025: 55 index (high)Jan 27, 2025: 49 index (low)Feb 6, 2025: 28 index (low)Feb 26, 2025: 68 index (high)Mar 3, 2025: 71 index (high)Mar 8, 2025: 67 index (high)Mar 13, 2025: 75 index (high)Mar 18, 2025: 80 index (high)Mar 28, 2025: 91 index (low)Apr 2, 2025: 121 index (low)Apr 7, 2025: 114 index (low)Apr 12, 2025: 115 index (low)Apr 17, 2025: 104 index (low)Apr 27, 2025: 98 index (high)May 2, 2025: 115 index (high)May 7, 2025: 144 index (low)May 9, 2025: 182 index (low)May 27, 2025: 214 index (low)Jun 1, 2025: 129 index (high)Jun 6, 2025: 165 index (low)Jun 11, 2025: 237 index (low)Jun 16, 2025: 202 index (low)Jun 21, 2025: 145 index (high)Jun 26, 2025: 155 index (high)Jul 1, 2025: 245 index (low)Jul 8, 2025: 161 index (high)Jul 16, 2025: 172 index (low)Jul 26, 2025: 113 index (high)Jul 28, 2025: 106 index (high)Jul 31, 2025: 92 index (high)Aug 15, 2025: 56 index (high)Aug 17, 2025: 74 index (high)Aug 20, 2025: 108 index (low)Aug 25, 2025: 142 index (low)Sep 19, 2025: 94 index (high)Sep 24, 2025: 63 index (high)Sep 26, 2025: 62 index (high)Sep 29, 2025: 90 index (high)Oct 14, 2025: 78 index (high)Oct 16, 2025: 87 index (high)Oct 19, 2025: 81 index (high)Oct 24, 2025: 83 index (high)Nov 3, 2025: 95 index (high)Nov 5, 2025: 92 index (high)Nov 8, 2025: 81 index (high)Nov 13, 2025: 104 index (high)Nov 18, 2025: 88 index (high)Nov 23, 2025: 82 index (high)Nov 25, 2025: 99 index (high)Dec 3, 2025: 114 index (high)Dec 13, 2025: 107 index (high)Dec 23, 2025: 116 index (high)Dec 28, 2025: 101 index (high)Jan 4, 2026: 127 index (low)Jan 7, 2026: 82 index (high)Jan 17, 2026: 124 index (high)Jan 27, 2026: 109 index (high)Feb 1, 2026: 110 index (high)Feb 6, 2026: 123 index (high)Feb 21, 2026: 119 index (high)Mar 8, 2026: 158 index (high)Mar 28, 2026: 167 index (high)Apr 12, 2026: 160 index (low)Apr 17, 2026: 169 index (high)Apr 24, 2026: 190 index (high)Apr 27, 2026: 236 index (high)May 7, 2026: 236 index (low)May 22, 2026: 250 index (low)Jun 11, 2026: 195 index (high)Jun 16, 2026: 230 index (low)Jun 21, 2026: 205 index (high)Jun 23, 2026: 222 index (high)Jun 26, 2026: 205 index (high)Jul 1, 2026: 217 index (high)Jul 6, 2026: 250 index (high)Jul 11, 2026: 235 index (high)Jul 26, 2026: 257 index (high)Aug 20, 2026: 165 index (high)Aug 22, 2026: 192 index (high)Aug 30, 2026: 182 index (high)Sep 4, 2026: 170 index (high)Sep 9, 2026: 162 index (high)Sep 11, 2026: 164 index (high)Sep 14, 2026: 155 index (high)Sep 19, 2026: 179 index (high)Sep 24, 2026: 136 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
Jan265758%
Feb386761%
Mar347662%
Apr3311733%
May3714930%
Jun3415447%
Jul3316158%
Aug4111154%
Sep457969%
Oct364947%
Nov415551%
Dec364644%

By year (median / highest): 2016: 58 / 121 (13 scenes) · 2017: 25 / 196 (19 scenes) · 2018: 67 / 125 (50 scenes) · 2019: 82 / 186 (43 scenes) · 2020: 94 / 164 (43 scenes) · 2021: 76 / 257 (49 scenes) · 2022: 76 / 264 (45 scenes) · 2023: 98 / 220 (44 scenes) · 2024: 102 / 254 (41 scenes) · 2025: 98 / 245 (54 scenes) · 2026: 170 / 257 (33 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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