Mid-Month Water Supply Outlook Update - East Side Sierra Nevada Basins
California-Nevada River Forecast Center
Issued Tuesday, April 17, 2012

Forecasts are based on preliminary data and are coordinated with the
  NRCS, Portland, OR.

* - DATA CURRENT AS OF: April 17, 2012 02:14:37 PM
   - Based on May 01, 2012 forecast values

                                       APRIL 17, 2012


LAKE TAHOE BASIN
                                             50%   % of   max   30%    70%    min   30-yr
Forecast Point                     period   (KAF)  avg  (KAF)  (KAF)  (KAF)  (KAF)   avg
--------------                     ------  ------ ---- ------ ------ ------ ------ ------

Lake Tahoe Rise (Gates Closed) (1) APR-HIGH  0.65   47   0.96   0.75   0.55   0.34   1.38
                                   MAY-HIGH  0.50   46   0.79   0.59   0.41   0.21   1.08

TRUCKEE RIVER BASIN
                                             50%   % of   max   30%    70%    min   30-yr
Forecast Point                     period   (KAF)  avg  (KAF)  (KAF)  (KAF)  (KAF)   avg
--------------                     ------  ------ ---- ------ ------ ------ ------ ------

L Truckee R ab Boca                APR-JUL     44   55    121     75   12.7   1.60     80
                                   MAY-JUL     35   56    108     65    7.6   1.26     63
Truckee R at Farad                 APR-JUL    130   50    200    159    101     58    260
                                   MAY-JUL     95   49    157    120     70     33    193

CARSON RIVER BASIN
                                             50%   % of   max   30%    70%    min   30-yr
Forecast Point                     period   (KAF)  avg  (KAF)  (KAF)  (KAF)  (KAF)   avg
--------------                     ------  ------ ---- ------ ------ ------ ------ ------

EF Carson R nr Gardnerville        APR-JUL     84   44    144    108     60     24    189
                                   MAY-JUL     70   45    107     85     55     33    155
WF Carson R at Woodfords           APR-JUL     26   46     40     32     20   12.2     56
                                   MAY-JUL     21   48     35     27   15.2    6.7     44
Carson R nr Carson City            APR-JUL     48   26     69     56     41     32    188
                                   MAY-JUL     38   25     70     50     28   15.8    152
Carson R nr Fort Churchill         APR-JUL     42   24     81     56     31   17.9    178
                                   MAY-JUL     35   24     64     45     26   16.5    145

WALKER RIVER BASIN
                                             50%   % of   max   30%    70%    min   30-yr
Forecast Point                     period   (KAF)  avg  (KAF)  (KAF)  (KAF)  (KAF)   avg
--------------                     ------  ------ ---- ------ ------ ------ ------ ------

E Walker R nr Bridgeport           APR-AUG     28   42     78     48    7.6    2.0     67
                                   MAY-AUG     25   42     68     42    7.8   1.77     59
W Walker R bl Little Walker nr ColeAPR-JUL     69   44     99     81     57     39    156
                                   MAY-JUL     63   46     97     77     49     29    138


 Max is 90th percentile and min is 10th percentile except with footnote 1 below.
 Averages are for the 1971-2000 period.
 All volumes are in thousands of acre-feet.

 footnotes:
 1) max is 95th percentile and min is 5th percentile
 2) streamflow is adjusted for upstream storage