Caltrans District 4 · storm summaries

Storms that crossed the 0.5 in threshold

After every storm that put at least 0.5 in of rain into a 24-hour block somewhere in District 4 — the Construction General Permit’s qualifying-precipitation trigger — this page adds a summary: how much of the district crossed it, where it rained most, and which Caltrans projects and CGP sites had an MQPE.

Early November 2026 storm — Nov 1–2, 2026: Nov 1–2, 2026 storm: 2 km² of District 4 crossed 0.5 in in 24 h; 0 Caltrans projects and 0 CGP sites had an MQPE.
Late October 2026 storm — Oct 21–23, 2026: Oct 21–23, 2026 storm: 2,497 km² of District 4 crossed 0.5 in in 24 h; 16 Caltrans projects and 116 CGP sites had an MQPE.
Mid-July 2026 storm — Jul 12–13, 2026: Jul 12–13, 2026 storm: 6 km² of District 4 crossed 0.5 in in 24 h; 0 Caltrans projects and 0 CGP sites had an MQPE.
Late May 2026 storm — May 26–29, 2026: May 26–29, 2026 storm: 5,280 km² of District 4 crossed 0.5 in in 24 h; 38 Caltrans projects and 140 CGP sites had an MQPE.
Early May 2026 storm — May 4–5, 2026: May 4–5, 2026 storm: 3,534 km² of District 4 crossed 0.5 in in 24 h; 14 Caltrans projects and 96 CGP sites had an MQPE.
Mid-April 2026 storm — Apr 20–23, 2026: Apr 20–23, 2026 storm: 18,304 km² of District 4 crossed 0.5 in in 24 h; 130 Caltrans projects and 1,123 CGP sites had an MQPE.
Early April 2026 storm — Apr 9–13, 2026: Apr 9–13, 2026 storm: 18,389 km² of District 4 crossed 0.5 in in 24 h; 125 Caltrans projects and 1,088 CGP sites had an MQPE.
Late March 2026 storm — Mar 31 – Apr 2, 2026: Mar 31 – Apr 2, 2026 storm: 1,238 km² of District 4 crossed 0.5 in in 24 h; 3 Caltrans projects and 19 CGP sites had an MQPE.
Late February 2026 storm — Feb 22–25, 2026: Feb 22–25, 2026 storm: 5,053 km² of District 4 crossed 0.5 in in 24 h; 25 Caltrans projects and 152 CGP sites had an MQPE.
Valentine’s Day 2026 storm — Feb 14–20, 2026: Feb 14–20, 2026 storm: 18,456 km² of District 4 crossed 0.5 in in 24 h; 117 Caltrans projects and 1,028 CGP sites had an MQPE.
Early February 2026 storm — Feb 10–12, 2026: Feb 10–12, 2026 storm: 10,331 km² of District 4 crossed 0.5 in in 24 h; 64 Caltrans projects and 405 CGP sites had an MQPE.
New Year’s 2026 storm — Dec 31, 2025 – Jan 7, 2026: Dec 31, 2025 – Jan 7, 2026 storm: 5,836 km² of District 4 crossed 0.5 in in 24 h; 37 Caltrans projects and 434 CGP sites had an MQPE.
Christmas 2025 storm — Dec 18–27, 2025: Dec 18–27, 2025 storm: 18,422 km² of District 4 crossed 0.5 in in 24 h; 103 Caltrans projects and 962 CGP sites had an MQPE.
Mid-December 2025 storm — Dec 16–17, 2025: Dec 16–17, 2025 storm: 181 km² of District 4 crossed 0.5 in in 24 h; 0 Caltrans projects and 0 CGP sites had an MQPE.
Mid-November 2025 storm — Nov 12–20, 2025: Nov 12–20, 2025 storm: 18,456 km² of District 4 crossed 0.5 in in 24 h; 96 Caltrans projects and 935 CGP sites had an MQPE.
Early November 2025 storm — Nov 4–6, 2025: Nov 4–6, 2025 storm: 9,134 km² of District 4 crossed 0.5 in in 24 h; 37 Caltrans projects and 255 CGP sites had an MQPE.
Mid-October 2025 storm — Oct 13–15, 2025: Oct 13–15, 2025 storm: 18,258 km² of District 4 crossed 0.5 in in 24 h; 85 Caltrans projects and 824 CGP sites had an MQPE.
Early October 2025 storm — Oct 1–3, 2025: Oct 1–3, 2025 storm: 33 km² of District 4 crossed 0.5 in in 24 h; 0 Caltrans projects and 0 CGP sites had an MQPE.
Late September 2025 storm — Sep 24–25, 2025: Sep 24–25, 2025 storm: 724 km² of District 4 crossed 0.5 in in 24 h; 3 Caltrans projects and 21 CGP sites had an MQPE.
Early September 2025 storm — Sep 9–11, 2025: Sep 9–11, 2025 storm: 113 km² of District 4 crossed 0.5 in in 24 h; 0 Caltrans projects and 2 CGP sites had an MQPE.
Late March 2025 storm — Mar 26 – Apr 2, 2025: Mar 26 – Apr 2, 2025 storm: 6,002 km² of District 4 crossed 0.5 in in 24 h; 12 Caltrans projects and 40 CGP sites had an MQPE.
Mid-March 2025 storm — Mar 12–20, 2025: Mar 12–20, 2025 storm: 16,509 km² of District 4 crossed 0.5 in in 24 h; 61 Caltrans projects and 338 CGP sites had an MQPE.
Early March 2025 storm — Mar 4–6, 2025: Mar 4–6, 2025 storm: 932 km² of District 4 crossed 0.5 in in 24 h; 1 Caltrans project and 3 CGP sites had an MQPE.
Valentine’s Day 2025 storm — Feb 12–16, 2025: Feb 12–16, 2025 storm: 18,456 km² of District 4 crossed 0.5 in in 24 h; 58 Caltrans projects and 342 CGP sites had an MQPE.
Late January 2025 storm — Jan 31 – Feb 8, 2025: Jan 31 – Feb 8, 2025 storm: 18,417 km² of District 4 crossed 0.5 in in 24 h; 55 Caltrans projects and 341 CGP sites had an MQPE.
Early January 2025 storm — Jan 2–4, 2025: Jan 2–4, 2025 storm: 3,138 km² of District 4 crossed 0.5 in in 24 h; 2 Caltrans projects and 13 CGP sites had an MQPE.
Christmas 2024 storm — Dec 21–30, 2024: Dec 21–30, 2024 storm: 15,204 km² of District 4 crossed 0.5 in in 24 h; 42 Caltrans projects and 209 CGP sites had an MQPE.
Mid-December 2024 storm — Dec 11–17, 2024: Dec 11–17, 2024 storm: 18,456 km² of District 4 crossed 0.5 in in 24 h; 50 Caltrans projects and 299 CGP sites had an MQPE.
Mid-November 2024 storm — Nov 20–26, 2024: Nov 20–26, 2024 storm: 18,456 km² of District 4 crossed 0.5 in in 24 h; 49 Caltrans projects and 291 CGP sites had an MQPE.
Early November 2024, second storm — Nov 10–14, 2024: Nov 10–14, 2024 storm: 5,007 km² of District 4 crossed 0.5 in in 24 h; 6 Caltrans projects and 30 CGP sites had an MQPE.
Early November 2024 storm — Nov 1–2, 2024: Nov 1–2, 2024 storm: 4,086 km² of District 4 crossed 0.5 in in 24 h; 2 Caltrans projects and 18 CGP sites had an MQPE.
Late October 2024 storm — Oct 28–29, 2024: Oct 28–29, 2024 storm: 15 km² of District 4 crossed 0.5 in in 24 h; 0 Caltrans projects and 0 CGP sites had an MQPE.
Early May 2024 storm — May 3–5, 2024: May 3–5, 2024 storm: 17,967 km² of District 4 crossed 0.5 in in 24 h; 33 Caltrans projects and 118 CGP sites had an MQPE.
Mid-April 2024 storm — Apr 12–16, 2024: Apr 12–16, 2024 storm: 13,104 km² of District 4 crossed 0.5 in in 24 h; 21 Caltrans projects and 43 CGP sites had an MQPE.
Early April 2024 storm — Apr 4–6, 2024: Apr 4–6, 2024 storm: 9,734 km² of District 4 crossed 0.5 in in 24 h; 17 Caltrans projects and 42 CGP sites had an MQPE.
Easter 2024 storm — Mar 27–31, 2024: Mar 27–31, 2024 storm: 12,007 km² of District 4 crossed 0.5 in in 24 h; 25 Caltrans projects and 50 CGP sites had an MQPE.
Late March 2024 storm — Mar 22–24, 2024: Mar 22–24, 2024 storm: 14,008 km² of District 4 crossed 0.5 in in 24 h; 24 Caltrans projects and 59 CGP sites had an MQPE.
Early March 2024 storm — Mar 10–12, 2024: Mar 10–12, 2024 storm: 2,899 km² of District 4 crossed 0.5 in in 24 h; 3 Caltrans projects and 3 CGP sites had an MQPE.
Late February 2024 storm — Feb 29 – Mar 7, 2024: Feb 29 – Mar 7, 2024 storm: 16,933 km² of District 4 crossed 0.5 in in 24 h; 26 Caltrans projects and 61 CGP sites had an MQPE.
Valentine’s Day 2024 storm — Feb 14–22, 2024: Feb 14–22, 2024 storm: 17,992 km² of District 4 crossed 0.5 in in 24 h; 29 Caltrans projects and 62 CGP sites had an MQPE.
Late January 2024 storm — Jan 31 – Feb 8, 2024: Jan 31 – Feb 8, 2024 storm: 18,426 km² of District 4 crossed 0.5 in in 24 h; 27 Caltrans projects and 53 CGP sites had an MQPE.
Mid-January 2024, third storm — Jan 19–25, 2024: Jan 19–25, 2024 storm: 18,376 km² of District 4 crossed 0.5 in in 24 h; 26 Caltrans projects and 46 CGP sites had an MQPE.
Mid-January 2024, second storm — Jan 16–17, 2024: Jan 16–17, 2024 storm: 4,442 km² of District 4 crossed 0.5 in in 24 h; 7 Caltrans projects and 11 CGP sites had an MQPE.
Mid-January 2024 storm — Jan 13–14, 2024: Jan 13–14, 2024 storm: 13,999 km² of District 4 crossed 0.5 in in 24 h; 17 Caltrans projects and 31 CGP sites had an MQPE.
Early January 2024, second storm — Jan 6–11, 2024: Jan 6–11, 2024 storm: 799 km² of District 4 crossed 0.5 in in 24 h; 0 Caltrans projects and 0 CGP sites had an MQPE.
Early January 2024 storm — Jan 2–3, 2024: Jan 2–3, 2024 storm: 14,036 km² of District 4 crossed 0.5 in in 24 h; 14 Caltrans projects and 20 CGP sites had an MQPE.
Late December 2023 storm — Dec 27–31, 2023: Dec 27–31, 2023 storm: 18,210 km² of District 4 crossed 0.5 in in 24 h; 25 Caltrans projects and 40 CGP sites had an MQPE.
Mid-December 2023 storm — Dec 17–21, 2023: Dec 17–21, 2023 storm: 18,192 km² of District 4 crossed 0.5 in in 24 h; 25 Caltrans projects and 39 CGP sites had an MQPE.
Early December 2023, second storm — Dec 6–7, 2023: Dec 6–7, 2023 storm: 3,765 km² of District 4 crossed 0.5 in in 24 h; 2 Caltrans projects and 2 CGP sites had an MQPE.
Early December 2023 storm — Dec 2–3, 2023: Dec 2–3, 2023 storm: 185 km² of District 4 crossed 0.5 in in 24 h; 0 Caltrans projects and 0 CGP sites had an MQPE.
Late November 2023 storm — Nov 28–29, 2023: Nov 28–29, 2023 storm: 928 km² of District 4 crossed 0.5 in in 24 h; 1 Caltrans project and 1 CGP site had an MQPE.
Mid-November 2023, second storm — Nov 17–19, 2023: Nov 17–19, 2023 storm: 12,910 km² of District 4 crossed 0.5 in in 24 h; 15 Caltrans projects and 9 CGP sites had an MQPE.
Mid-November 2023 storm — Nov 14–15, 2023: Nov 14–15, 2023 storm: 1,648 km² of District 4 crossed 0.5 in in 24 h; 0 Caltrans projects and 0 CGP sites had an MQPE.
Early November 2023 storm — Nov 5–6, 2023: Nov 5–6, 2023 storm: 210 km² of District 4 crossed 0.5 in in 24 h; 0 Caltrans projects and 0 CGP sites had an MQPE.
Late October 2023 storm — Oct 22–23, 2023: Oct 22–23, 2023 storm: 4,741 km² of District 4 crossed 0.5 in in 24 h; 2 Caltrans projects and 0 CGP sites had an MQPE.
Early May 2023 storm — May 1–8, 2023: May 1–8, 2023 storm: 5,487 km² of District 4 crossed 0.5 in in 24 h; 2 Caltrans projects and 0 CGP sites had an MQPE.
Early April 2023 storm — Apr 6–7, 2023: Apr 6–7, 2023 storm: 4,699 km² of District 4 crossed 0.5 in in 24 h; 2 Caltrans projects and 0 CGP sites had an MQPE.
Late March 2023 storm — Mar 27–30, 2023: Mar 27–30, 2023 storm: 17,123 km² of District 4 crossed 0.5 in in 24 h; 17 Caltrans projects and 0 CGP sites had an MQPE.
Mid-March 2023 storm — Mar 18–23, 2023: Mar 18–23, 2023 storm: 18,349 km² of District 4 crossed 0.5 in in 24 h; 17 Caltrans projects and 0 CGP sites had an MQPE.
Early March 2023 storm — Mar 4–15, 2023: Mar 4–15, 2023 storm: 18,456 km² of District 4 crossed 0.5 in in 24 h; 17 Caltrans projects and 0 CGP sites had an MQPE.
Late February 2023 storm — Feb 23 – Mar 1, 2023: Feb 23 – Mar 1, 2023 storm: 18,454 km² of District 4 crossed 0.5 in in 24 h; 17 Caltrans projects and 0 CGP sites had an MQPE.
Early February 2023 storm — Feb 2–6, 2023: Feb 2–6, 2023 storm: 13,653 km² of District 4 crossed 0.5 in in 24 h; 8 Caltrans projects and 0 CGP sites had an MQPE.
New Year’s 2023 storm — Dec 26, 2022 – Jan 19, 2023: Dec 26, 2022 – Jan 19, 2023 storm: 18,456 km² of District 4 crossed 0.5 in in 24 h; 17 Caltrans projects and 0 CGP sites had an MQPE.
Late November 2022 storm — Nov 30 – Dec 12, 2022: Nov 30 – Dec 12, 2022 storm: 18,456 km² of District 4 crossed 0.5 in in 24 h; 12 Caltrans projects and 0 CGP sites had an MQPE.
Early November 2022, second storm — Nov 5–9, 2022: Nov 5–9, 2022 storm: 18,456 km² of District 4 crossed 0.5 in in 24 h; 9 Caltrans projects and 0 CGP sites had an MQPE.
Early November 2022 storm — Nov 1–3, 2022: Nov 1–3, 2022 storm: 914 km² of District 4 crossed 0.5 in in 24 h; 0 Caltrans projects and 0 CGP sites had an MQPE.
Mid-September 2022 storm — Sep 17–20, 2022: Sep 17–20, 2022 storm: 10,064 km² of District 4 crossed 0.5 in in 24 h; 5 Caltrans projects and 0 CGP sites had an MQPE.