Bureau of Reclamation’s water operations in the upper Snake River watershed.

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Bureau of Reclamation’s water operations in the upper Snake River watershed.

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

 

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