Precipitation
Precipitation across the basin was below average this past month. January
precipitation was 46 percent of average (45 percent of last year) for the 5
reporting stations. January precipitation ranged from 27 to 83 percent of
average. The Little Snake River basin water-year-to-date precipitation is
currently 74 percent of average (100 percent of last year). Year-to-date
percentages range from 64 to 84 percent of average.
Streamflow
Runoff yield in the Little Snake River drainage is expected to be below
normal this year. Stream yield is based on the 50 percent probability for
the April through July forecast period. The Little Snake River near Slater
should yield about 112,000 acre-feet (72 percent of normal). Little Snake
River near Dixon is estimated to yield 240,000 acre-feet (73 percent of
normal).
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LITTLE SNAKE RIVER BASIN
Streamflow Forecasts - February 1, 2001
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| <<====== Drier ====== Future Conditions ======= Wetter =====>> |
| |
Forecast Point Forecast | ==================== Chance Of Exceeding * ====================== |
Period | 90% 70% | 50% (Most Probable) | 30% 10% | 30-Yr Avg.
| (1000AF) (1000AF) | (1000AF) (% AVG.) | (1000AF) (1000AF) | (1000AF)
====================================================================|=======================|=====================================
Little Snake River nr Slater APR-JUL 74 95 | 112 72 | 130 159 155
| |
LITTLE SNAKE R nr Dixon APR-JUL 119 191 | 240 73 | 289 361 329
| |
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LITTLE SNAKE RIVER BASIN | LITTLE SNAKE RIVER BASIN
Reservoir Storage (1000 AF) - End of January | Watershed Snowpack Analysis - February 1, 2001
==================================================================================================================================
Usable | *** Usable Storage *** | Number This Year as % of
Reservoir Capacity| This Last | Watershed of =================
| Year Year Avg | Data Sites Last Yr Average
========================================================================|=========================================================
| LITTLE SNAKE RIVER 8 95 76
|
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* 90%, 70%, 30%, and 10% chances of exceeding are the probabilities that the actual volume will exceed the volumes in the table.
The average is computed for the 1961-1990 base period.
(1) - The values listed under the 10% and 90% Chance of Exceeding are actually 5% and 95% exceedance levels.
(2) - The value is natural volume - actual volume may be affected by upstream water management.
To February 2001 Basin Outlook Report Contents Page