Precipitation
Precipitation was below average for the 3 reporting stations during
February. Precipitation ranged from 58 to 162 percent of average for
the month. The entire basin received 73 percent of average for the
month (66 percent of last year). The basin year-to-date precipitation
is currently 57 percent of average (79 percent of last year). Year
to date percentages range from 51 to 65.
Reservoir
Fontenelle Reservoir is currently storing 95,900 acre feet; this is
56 percent of average (73 % of last year). Flaming Gorge is
currently storing 2,996,000 acre feet. There is no average
established for Flaming Gorge. Viva Naughton is currently storing
31,100 acre feet (112 percent of average).
Streamflow Expected yields vary from 48 to 74 percent of average across the basin. The following forecast values are based on a 50 percent chance probability for the April through July forecast period. Green River near Green River is forecast to yield about 530,000-acre feet (59 percent of average). Blacks Fork near Robertson is forecast to yield 70,000-acre feet (74 percent of average). East Fork of Smiths Fork near Robertson is estimated to yield 22,000 acre-feet (73 percent of average). The estimated yield for Hams Fork near Frontier is 35,000-acre feet (53 percent of average). Viva Naughton Reservoir inflow will be about 43,000-acre feet (48 percent of average). Flaming Gorge Reservoir inflow will be about 750,000-acre feet (63 percent of average).
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LOWER GREEN RIVER BASIN
Streamflow Forecasts - March 1, 2001
==================================================================================================================================
| <<====== 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)
====================================================================|=======================|=====================================
Green River nr Green River, WY APR-JUL 294 435 | 530 59 | 625 766 899
| |
Blacks Fork nr Robertson APR-JUL 42 59 | 70 74 | 81 98 95
| |
EF of Smiths Fork nr Robertson APR-JUL 16.7 19.7 | 22 73 | 25 29 30
| |
Hams Fk blw Pole Ck nr Frontier APR-JUL 20 29 | 35 53 | 42 54 66
| |
Hams Fk Inflow to Viva Naughton Res APR-JUL 11.3 30 | 43 48 | 56 75 89
| |
Flaming Gorge Reservoir Inflow APR-JUL 423 618 | 750 63 | 883 1078 1196
| |
==================================================================================================================================
LOWER GREEN RIVER BASIN | LOWER GREEN RIVER BASIN
Reservoir Storage (1000 AF) - End of February | Watershed Snowpack Analysis - March 1, 2001
==================================================================================================================================
Usable | *** Usable Storage *** | Number This Year as % of
Reservoir Capacity| This Last | Watershed of =================
| Year Year Avg | Data Sites Last Yr Average
========================================================================|=========================================================
FONTENELLE 344.8 95.9 130.8 172.0 | HAMS FORK RIVER 4 75 66
|
FLAMING GORGE 3749.0 2996.0 3208.0 --- | BLACKS FORK 5 60 67
|
VIVA NAUGHTON RES 42.4 31.1 34.5 27.8 | HENRYS FORK 3 111 91
|
| GREEN above Flaming Gorge 26 72 66
|
==================================================================================================================================
* 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 March 2001 Basin Outlook Report Contents Page