Hello,
Below is an update on the Bureau of Reclamation’s water operations in the upper Snake River watershed.
Thanks,
Brian
(Friday May 17, 2019)
Subject: 2019 Upper Snake River Operations Update
Purpose: The purpose of these Operation Updates is to provide information regarding Reclamation’s operations as the season progresses. The operations outlined in this update are based on the best data available at the time and are subject to change as new information becomes available. For additional information and resources, please visit our website at: https://www.usbr.gov/pn/hydromet/uppersnake/ .
Summary
The Upper Snake reservoir system is currently 80% full (3,229,705 acre-feet out of 4,045,695 acre-feet).
The precipitation outlook for the next week looks moderate with widespread one to two inches forecasted over the next 7 days. Temperatures are forecast to remain cool over the next week. The first half of May was drier and cooler than normal, but due to the expected precipitation, runoff forecasts were not revised from the May 1 values.
Jackson Lake’s discharge was increased from 3,000 cfs to 4,500 cfs this week as storage content continues to track near flood control requirements.
Facility | % Full | Storage (acre-feet) | May – July Runoff Forecast % of Normal | Yesterday’s Inflow (cfs) | Estimated Outflow (cfs) | Next anticipated discharge change |
Jackson Lake | 79% | 671,402 | 112% | 7,900 | 4,500 | Not scheduled |
Palisades | 55% | 656,331 | 107% | 21,300 | 13,000 | Not scheduled |
Ririe | 97% | 78,248 | 110% | 370 | 150 | Not scheduled |
Island Park | 88% | 118,398 | 109% | 1,390 | 750 | Decrease to 700 cfs tomorrow (5/18) morning |
Grassy Lake | 94% | 14,336 | – | 53 | 0 | Not scheduled |
American Falls | 96% | 1,600,000 | – | 9,700 | 8,500 | Not scheduled |
Minidoka | 97% | 92,624 | – | 9,700 | 6,760 | Not scheduled |
Milner | 0.5 feet below full | – | 7,300 | 0 *River QD | Not scheduled | |
Little Wood | 94% | 28,072 | 118% | 520 | 320 | Not scheduled |