Mid-month Water Supply Outlook Update – Upper Klamath Basin
California-Nevada River Forecast Center
Issued Wednesday, April 16, 2008

Forecasts are coordinated with the NRCS, Portland, OR.

 * - DATA CURRENT AS OF: April 16, 2008 12:12:50 PM
   - Based on May 01, 2008 forecast values



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

Clear Lake Inflow (2)              MAY-JUL     21  109     38     28   14.3    4.4   19.3
                                   MAY-SEP     28  108     43     34     22   13.0     26
Gerber Reservoir Inflow (2)        MAY-JUL    6.6  103   16.7   10.7    2.5   1.00    6.4
                                   MAY-SEP    6.8  103   16.7   10.8    2.8   1.00    6.6
Sprague R nr Chiloquin             MAY-JUL    141  110    191    161    121     91    128
                                   MAY-SEP    170  110    220    190    150    120    155
Williamson R bl Sprague R nr ChiloqMAY-JUL    215  105    270    240    192    159    205
                                   MAY-SEP    280  106    340    305    255    220    265
Upper Klamath Lake Inflow (1,2)    MAY-JUL    270  106    365    300    240    176    255
                                   MAY-SEP    360  106    455    390    330    265    340

 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