May 2022 : Dry
Report period: May 1-31, 2022
Target Flows
- May 1 - 10 : 1700 CFS
- May 11 - 19 : 800 CFS
- May 20 - 26 : 800 CFS
- May 27 - 31 : 800 CFS
One of the goals of the Program is to achieve target flows based on the current hydrologic condition of the Platte River. This hydrologic condition is calculated using a formula contained in the Program's Water Plan.
For more information, see these documents:
View target flows View past conditions summary Annual designations
Report period: May 1-31, 2022
Target Flows
Report period: March 1 - April 30, 2022
Target Flows
The monthly Palmer Drought Severity Index (PDSI) changed the hydrologic condition from "NORMAL" to "DRY"
Report period: December 1, 2021 - February 28, 2022
Target Flows
Report period: October 1 - November 30, 2021
Target Flows
Report period: August 1 - September 30, 2021
Target Flows
The monthly Palmer Drought Severity Index increased the hydrologic condition index from 0.216 to 0.355 and changed the hydrologic condition from "DRY" to "NORMAL"
Report period: July 1-31, 2021
Target Flows
The monthly Palmer Drought Severity Index reduced the hydrologic condition index from 0.433 to 0.295 and changed the hydrologic condition from "NORMAL" to "DRY"
Report period: June 1-30, 2021
Target Flows
Report period: May 1-31, 2021
Target Flows
Report period: March 1 - April 30, 2021
Target Flows
The monthly Palmer Drought Severity Index lowered the hydrologic condition from "NORMAL" to "DRY"
Report period: December 1, 2020 - February 28, 2021
Target Flows
Report period: October 1 - November 30, 2020
Target Flows
Report period: August 1 - September 30, 2020
Target Flows
Report period: July 1-31, 2020
Target Flows
Report period: June 1-30, 2020
Target Flows
Report period: May 1 - June 1, 2020
Target Flows
Report period: March 1 - April 30, 2020
Target Flows
Report period: December 1, 2019 - February 29, 2020
Target Flows
Report period: October 1 - November 30, 2019
Target Flows
Report period: August 1 - September 30, 2019
Target Flows
Report period: July 1-31, 2019
Target Flows
Report period: June 1-30, 2019
Target Flows
Report period: May 1-31, 2019
Target Flows
Report period: March 1 - April 30, 2019
Target Flows
Report period: December 1, 2018 - February 28, 2019
Target Flows
Report period: October 1 - November 30, 2018
Target Flows
Report period: August 1 - September 30, 2018
Target Flows
The mean July Palmer Drought Severity Index for two climate stations in Nebraska (NCDC Nebraska Divisions 5 and 8) was 1.32 equivalent to 45.3% of the 1947-1994 July conditions.
The July end-of-month content in Lake McConaughy as a percent of total capacity was 83.1%, equivalent to the 44.5% level of July end-of-month content over the 1947-1994 period.
For this period, the threshold index value is 0.29 for "normal" conditions. The current index value is greater than this and constitutes "NORMAL" conditions.
Note that for the August-September period, there are only "dry" and "normal" designations because "wet" targets are the same as "normal" targets for this period.
Report period: July 1-31, 2018
Target Flows
Report period: June 1-30, 2018
Target Flows
To set the hydrologic condition for June, an index of conditions is computed using four Platte basin variables. These variables and their corresponding values were as follows:
For this period, the threshold index value is 0.30 for "normal" conditions and 0.70 for "wet" conditions. The current index value is greater than 0.30 and less than 0.70 and constitutes "???" conditions.
*based on temporary weekly PDSI data, to be updated when monthly PDSI data is available.
Report period: May 1-31, 2018
Target Flows
The mean April streamflow in the Platte River at Grand Island was 2,055 cfs (provisional USGS data), or at the 62.9 percentile level of 1947-1994 April flows.
The April end-of-month content of Lake McConaughy was 1,467,900 acre-feet, equivalent to 84.2% of maximum capacity and 25.7 percentile level of the 1947-1994 April percent-of-capacity.
The April end-of-month content of three upper South Platte reservoirs (Antero, Eleven-Mile, and Cheesman) was 186,525 acre-feet, equivalent to the 68.7 percentile level of their 1947-1994 April contents.
The April 1 percent-of-normal snowpack in the North Platte Basin of Wyoming* (seven specific NRCS locations) was 101.4% of normal, equivalent to the 62.2 percentile level of 1947-1994 conditions.
The threshold index value is 0.30 for "normal" conditions and 0.70 for "wet" conditions. The current index value is greater than 0.30 and less than 0.70 and constitutes "NORMAL" condition.
Report period: March 1 - April 30, 2018
Target Flows
The mean February streamflow for the Platte River near Grand Island gage (provisional USGS data) was 1,710* cubic feet per second, equivalent to the 51.3 percentile level of 1947-1994 February conditions. (*The USGS streamflow gage at Grand Island reported "ICE" conditions for the entirety of February. Data from the Overton gage was used as a surrogate)
The mean February Palmer Drought Severity Index for four climate zones in three states (NCDC divisions Colorado #4, Wyoming #8, and Nebraska #1 and #7) was -0.52, equivalent to the 45.6 percentile level of 1947-1994 February conditions.
The February end-of-month content of seven North Platte reservoirs (Alcova, Glendo, Gray Reef, Guernsey, Kortes, Pathfinder, and Seminoe) was approximately 2,125,352 acre-feet, equivalent to the 97.1 percentile level of 1947-1994 end-of-month February conditions.
For this period, the threshold index value is 0.25 for "normal" conditions. The current index value is less than this and constitutes "NORMAL" conditions.
Note that for the March-April period, there are only "dry" and "normal" designations because "wet" targets are the same as "normal" targets for this period.