Precipitation
The 12 reporting precipitation sites in the basin were 73 percent of the
February average (66 percent of last year at this time). February
precipitation varied from 58 to 162 percent of average. Water year-to-date
precipitation is about 57 percent of average (79 percent of last year).
Year to date percentage of average ranges from 51 to 65 percent for the
reporting stations.
Reservoir
Big Sandy Reservoir is storing 5,500 acre-feet (30 percent of average and
48 percent of the total capacity). Eden Reservoir is storing 0 acre-feet (0
percent of average and 0 percent of the total capacity). Fontenelle
Reservoir is storing 95,900 acre-feet (56 percent of average and 50 percent
of the total capacity). Flaming Gorge Reservoir is currently storing
2,996,000 acre feet -- 93 percent of last year and 80 percent of capacity.
There is no average established for Flaming Gorge. Detailed reservoir data
is shown on the following page and on the reservoir storage summary at the
beginning of this report.
Streamflow
The fifty-percent chance April through July runoff in the Upper Green River
basin is forecast below average. Green River at Warren Bridge is expected
to yield about 180,000 acre-feet (68 percent of normal). Pine Creek above
Fremont Lake is expected to yield 80,000 acre-feet (77 percent of normal).
New Fork River near Big Piney is expected to yield about 260,000 acre-feet
(68 percent of normal). Fontenelle Reservoir Inflow is estimated to be
530,000 acre-feet (62 percent of average), and Big Sandy near Farson is
expected to be about 42,000 acre-feet (74 percent of normal).
==================================================================================================================================
UPPER 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 at Warren Bridge APR-JUL 121 156 | 180 68 | 204 239 266
| |
Pine Creek abv Fremont Lake APR-JUL 64 73 | 80 77 | 87 96 104
| |
New Fork River nr Big Piney APR-JUL 154 217 | 260 68 | 303 366 385
| |
Fontenelle Reservoir Inflow APR-JUL 383 468 | 530 62 | 596 700 849
| |
Big Sandy River nr Farson APR-JUL 25 35 | 42 74 | 49 60 57
| |
==================================================================================================================================
UPPER GREEN RIVER BASIN | UPPER 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
========================================================================|=========================================================
BIG SANDY 38.3 5.5 --- 18.4 | GREEN above Warren Bridge 4 75 63
|
EDEN 11.8 0.0 --- 4.1 | UPPER GREEN (West Side) 7 67 60
|
FLAMING GORGE 3749.0 2996.0 3208.0 --- | NEWFORK RIVER 3 94 83
|
FONTENELLE 344.8 95.9 130.8 172.0 | BIG SANDY/EDEN VALLEY 2 78 65
|
| GREEN above Fontenelle 14 72 64
|
==================================================================================================================================
* 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