Hydrologic conditions

Recent and Historical Condition Determinations

This summary provides the official Program determinations of hydrologic condition, whether dry, normal, or wet, used to inform management actions and measure progress toward recovery goals.

Streamflow conditions Past conditions summary Target flows Annual Designations
PeriodConditionIndex
December 2025 - February 2026normal0.296
December 2025 - February 2026normal0.296
October-November 2025normal0.458
October-November 2025normal0.458
August-September 2025dry0.184
July 2025dry0.203
June 2025dry0.195
May 2025dry0.072
March-April 2025dry0.207
December 2024-February 2025normal0.299
October-November 2024dry0.202
August-September 2024dry0.233
July 2024normal0.310
June 2024normal0.561
May 2024normal0.335
March-April 2024normal0.640
December 2023-February 2024normal0.488
October-November 2023normal0.513
August-September 2023dry0.110
July 2023normal0.604
June 2023dry0.288
May 2023dry0.205
March-April 2023dry0.118
December 2022-February 2023dry0.222
October-November 2022dry0.019
August-September 2022dry0.100
July 2022dry0.135
June 2022dry0.231
May 2022dry0.068
March-April 2022dry0.118
December 2021-February 2022normal0.421
October-November 2021normal0.300
August-September 2021normal0.355
July 2021dry0.295
June 2021normal0.429
May 2021dry0.282
March-April 2021dry0.218
December-January-February 2020-2021normal
October-November 2020normal
August-September 2020normal0.542
July 2020normal
June 2020wet
May 2020wet0.924
March-April 2020normal
December-January-February 2020normal
October-November 2019wet
August-September 2019normal
July 2019normal
June 2019wet
May 2019wet
March-April 2018normal
December 2018 to February 2019normal
October and November 2018normal
August and September 2018normal0.552
July 2018normal
June 2018normal0.663
May 2018normal0.561
March-April 2018normal0.545
Hydrologic conditions: 1/1/18 to 2/28/18: Normalnormal
Hydrologic conditions: 10/1/17 to 12/31/17: Normalnormal
Hydrologic conditions: 8/1/17 to 9/30/17: Drydry
Hydrologic conditions: 7/1/17 to 7/31/17: Normalnormal
Hydrologic conditions: 6/1/17 to 6/30/17: Wetwet
Hydrologic conditions: 1/1/17 to 5/31/17: Normalnormal
Hydrologic conditions: 12/1/16 to 12/31/16: Normalnormal
Hydrologic conditions: 10/1/16 to 11/30/16: Wetwet
Hydrologic conditions: 7/1/16 to 9/30/16: Normalnormal
Hydrologic conditions: 6/1/16 to 6/30/16: Wetwet
Hydrologic conditions: 1/1/16 to 5/31/16: Normalnormal
Hydrologic conditions: 12/1/15 to 12/31/15: Normalnormal
Hydrologic conditions: 10/1/15 to 11/30/15: Wetwet
Hydrologic conditions: 7/1/15 to 9/30/15: Normalnormal
Hydrologic conditions: 6/1/15 to 6/30/15: Wetwet
Hydrologic conditions: 1/1/15 to 5/31/15: Normalnormal
Hydrologic conditions: 12/1/14 to 12/31/14: Normalnormal
Hydrologic conditions: 10/1/14 to 11/30/14: Wetwet
Hydrologic conditions: 8/1/14 to 9/30/14: Drydry
Hydrologic conditions: 1/1/14 to 7/31/14: Normalnormal
Hydrologic conditions: 10/1/13 to 12/31/13: Normalnormal
Hydrologic conditions: 6/1/13 to 9/30/13: Drydry
Hydrologic conditions: 5/1/13 to 5/31/13: Normalnormal
Hydrologic conditions: 1/1/13 to 4/30/13: Drydry
Hydrologic conditions: 5/1/12 to 12/31/12: Drydry
Hydrologic conditions: 1/1/12 to 4/30/12: Normalnormal
Hydrologic conditions: 12/1/11 to 12/31/11: Normalnormal
Hydrologic conditions: 10/1/11 to 11/30/11: Wetwet
Hydrologic conditions: 7/1/11 to 9/30/11: Normalnormal
Hydrologic conditions: 5/1/11 to 6/30/11: Wetwet
Hydrologic conditions: 1/1/11 to 4/30/11: Normalnormal
Hydrologic conditions: 12/1/10 to 12/31/10: Normalnormal
Hydrologic conditions: 10/1/10 to 11/30/10: Wetwet
Hydrologic conditions: 7/1/10 to 9/30/10: Normalnormal
Hydrologic conditions: 6/1/10 to 6/30/10: Wetwet
Hydrologic conditions: 1/1/10 to 5/31/10: Normalnormal
Hydrologic conditions: 12/1/09 to 12/31/09: Normalnormal
Hydrologic conditions: 10/1/09 to 11/30/09: Wetwet
Hydrologic conditions: 1/1/09 to 9/30/09: Normalnormal
Hydrologic conditions: 7/1/08 to 12/31/08: Normalnormal
Hydrologic conditions: 6/1/08 to 6/30/08: Wetwet
Hydrologic conditions: 5/1/08 to 5/31/08: Drydry
Hydrologic conditions: 3/1/08 to 4/30/08: Normalnormal
Hydrologic conditions: 1/1/08 to 2/29/08: Drydry
Hydrologic conditions: 12/1/07 to 12/31/07: Drydry
Hydrologic conditions: 6/1/07 to 11/30/07: Normalnormal
Hydrologic conditions: 5/1/07 to 5/31/07: Drydry
Hydrologic conditions: 3/1/07 to 4/30/07: Normalnormal
Hydrologic conditions: 1/1/07 to 2/28/07: Drydry
Hydrologic conditions: 5/1/06 to 12/31/06: Drydry
Hydrologic conditions: 3/1/06 to 4/30/06: Normalnormal
Hydrologic conditions: 1/1/06 to 2/28/06: Drydry
Hydrologic conditions: 8/1/05 to 12/31/05: Drydry
Hydrologic conditions: 6/1/05 to 7/31/05: Normalnormal
Hydrologic conditions: 5/1/05 to 5/31/05: Drydry
Hydrologic conditions: 3/1/05 to 4/30/05: Normalnormal
Hydrologic conditions: 1/1/05 to 2/28/05: Drydry
Hydrologic conditions: 1/1/04 to 12/31/04: Drydry
Hydrologic conditions: 1/1/03 to 12/31/03: Drydry
Hydrologic conditions: 1/1/02 to 12/31/02: Drydry
Hydrologic conditions: 10/1/01 to 12/31/01: Normalnormal
Hydrologic conditions: 7/1/01 to 9/30/01: Drydry
Hydrologic conditions: 1/1/01 to 6/30/01: Normalnormal
Hydrologic conditions: 10/1/00 to 12/31/00: Normalnormal
Hydrologic conditions: 7/1/00 to 9/30/00: Drydry
Hydrologic conditions: 6/1/00 to 6/30/00: Normalnormal
Hydrologic conditions: 5/1/00 to 5/31/00: Wetwet
Hydrologic conditions: 1/1/00 to 4/30/00: Normalnormal
Hydrologic conditions: 12/1/99 to 12/31/99: Normalnormal
Hydrologic conditions: 10/1/99 to 11/30/99: Wetwet
Hydrologic conditions: 7/1/99 to 9/30/99: Normalnormal
Hydrologic conditions: 5/1/99 to 6/30/99: Wetwet
Hydrologic conditions: 1/1/99 to 4/30/99: Normalnormal
Hydrologic conditions: 7/1/98 to 12/31/98: Normalnormal
Hydrologic conditions: 5/1/98 to 6/30/98: Wetwet
Hydrologic conditions: 1/1/98 to 4/30/98: Normalnormal
Hydrologic conditions: 12/1/97 to 12/31/97: Normalnormal
Hydrologic conditions: 10/1/97 to 11/30/97: Wetwet
Hydrologic conditions: 6/1/97 to 9/30/97: Normalnormal
Hydrologic conditions: 5/1/97 to 5/31/97: Wetwet
Hydrologic conditions: 1/1/97 to 4/30/97: Normalnormal
Hydrologic conditions: 12/1/96 to 12/31/96: Normalnormal
Hydrologic conditions: 10/1/96 to 11/30/96: Wetwet
Hydrologic conditions: 1/1/96 to 9/30/96: Normalnormal
Hydrologic conditions: 12/1/95 to 12/31/95: Normalnormal
Hydrologic conditions: 10/1/95 to 11/30/95: Wetwet
Hydrologic conditions: 7/1/95 to 9/30/95: Normalnormal
Hydrologic conditions: 6/1/95 to 6/30/95: Wetwet
Hydrologic conditions: 5/1/95 to 5/31/95: Drydry
Hydrologic conditions: 1/1/95 to 4/30/95: Normalnormal