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COLUMBIA - GRAND COULEE DAM (GCDW1)
Forecasts for Water Year
2026
Natural Forecast
ESP with 10 Days QPF     Ensemble: 2025-10-12 Issued: 2025-10-12 Hide Forecast
Forecasts Are in KAF 30 Year
Average

(1991-2020)
90 % 50 % %
Average
10 %
APR-SEP 46094 56732 91 72187 62538
APR-JUL 36640 44680 85 56709 52578
APR-AUG 42533 52194 89 66841 58757
JAN-SEP 52162 63690 89 81005 71301
JAN-JUL 42707 51509 84 64183 61341
OCT-SEP 58401 70020 87 87788 80441
Experimental
HEFS with 15 days EQPF    Ensemble: 2025-10-12  Issued: 2025-10-12 Hide Forecast
APR-SEP 47132 57353 92 73714 62538
APR-JUL 37050 45177 86 57339 52578
APR-AUG 43482 53039 90 68105 58757
JAN-SEP 53202 64482 90 81223 71301
JAN-JUL 43486 52391 85 64848 61341
OCT-SEP 59285 70895 88 88782 80441
Reference
ESP with 0 Days QPF    Ensemble: 2025-10-12  Issued: 2025-10-12 Hide Forecast
APR-SEP 47462 57824 92 73435 62538
APR-JUL 37320 45080 86 57083 52578
APR-AUG 43747 53726 91 67833 58757
JAN-SEP 53236 64569 91 80821 71301
JAN-JUL 43663 52284 85 65152 61341
OCT-SEP 59221 71818 89 87399 80441
Move the mouse over the desired "Forecast Period" to display a graph.
<table id=popup_table>
                     <tr><td id=popup_table_td_ESPTYPE colspan=2>ESP10<br><label id=popup_table_td_date>Oct 2, 2025</label></td></tr>
                     <tr><td id=popup_table_td_data_max>MAX:</td><td id=popup_table_td_data>85564</td></tr>
                     <tr><td id=popup_table_td_data_10>10%:</td><td id=popup_table_td_data>72809</td></tr>
                     <tr><td id=popup_table_td_data_25>25%:</td><td id=popup_table_td_data>64491</td></tr>
                     <tr><td id=popup_table_td_data_50>50%:</td><td id=popup_table_td_data_50>57294</td></tr>
                     <tr><td id=popup_table_td_data_75>75%:</td><td id=popup_table_td_data>50291</td></tr>
                     <tr><td id=popup_table_td_data_90>90%:</td><td id=popup_table_td_data>46866</td></tr>
                     <tr><td id=popup_table_td_data_min>MIN:</td><td id=popup_table_td_data>36588</td></tr>
                   </table> <table id=popup_table>
                     <tr><td id=popup_table_td_ESPTYPE colspan=2>ESP10<br><label id=popup_table_td_date>Oct 3, 2025</label></td></tr>
                     <tr><td id=popup_table_td_data_max>MAX:</td><td id=popup_table_td_data>86275</td></tr>
                     <tr><td id=popup_table_td_data_10>10%:</td><td id=popup_table_td_data>73442</td></tr>
                     <tr><td id=popup_table_td_data_25>25%:</td><td id=popup_table_td_data>64868</td></tr>
                     <tr><td id=popup_table_td_data_50>50%:</td><td id=popup_table_td_data_50>57911</td></tr>
                     <tr><td id=popup_table_td_data_75>75%:</td><td id=popup_table_td_data>50868</td></tr>
                     <tr><td id=popup_table_td_data_90>90%:</td><td id=popup_table_td_data>47552</td></tr>
                     <tr><td id=popup_table_td_data_min>MIN:</td><td id=popup_table_td_data>37204</td></tr>
                   </table> <table id=popup_table>
                     <tr><td id=popup_table_td_ESPTYPE colspan=2>ESP10<br><label id=popup_table_td_date>Oct 4, 2025</label></td></tr>
                     <tr><td id=popup_table_td_data_max>MAX:</td><td id=popup_table_td_data>85468</td></tr>
                     <tr><td id=popup_table_td_data_10>10%:</td><td id=popup_table_td_data>73046</td></tr>
                     <tr><td id=popup_table_td_data_25>25%:</td><td id=popup_table_td_data>64522</td></tr>
                     <tr><td id=popup_table_td_data_50>50%:</td><td id=popup_table_td_data_50>57370</td></tr>
                     <tr><td id=popup_table_td_data_75>75%:</td><td id=popup_table_td_data>50586</td></tr>
                     <tr><td id=popup_table_td_data_90>90%:</td><td id=popup_table_td_data>46805</td></tr>
                     <tr><td id=popup_table_td_data_min>MIN:</td><td id=popup_table_td_data>36959</td></tr>
                   </table> <table id=popup_table>
                     <tr><td id=popup_table_td_ESPTYPE colspan=2>ESP10<br><label id=popup_table_td_date>Oct 5, 2025</label></td></tr>
                     <tr><td id=popup_table_td_data_max>MAX:</td><td id=popup_table_td_data>85035</td></tr>
                     <tr><td id=popup_table_td_data_10>10%:</td><td id=popup_table_td_data>73239</td></tr>
                     <tr><td id=popup_table_td_data_25>25%:</td><td id=popup_table_td_data>64187</td></tr>
                     <tr><td id=popup_table_td_data_50>50%:</td><td id=popup_table_td_data_50>57559</td></tr>
                     <tr><td id=popup_table_td_data_75>75%:</td><td id=popup_table_td_data>50798</td></tr>
                     <tr><td id=popup_table_td_data_90>90%:</td><td id=popup_table_td_data>46984</td></tr>
                     <tr><td id=popup_table_td_data_min>MIN:</td><td id=popup_table_td_data>37220</td></tr>
                   </table> <table id=popup_table>
                     <tr><td id=popup_table_td_ESPTYPE colspan=2>ESP10<br><label id=popup_table_td_date>Oct 6, 2025</label></td></tr>
                     <tr><td id=popup_table_td_data_max>MAX:</td><td id=popup_table_td_data>85165</td></tr>
                     <tr><td id=popup_table_td_data_10>10%:</td><td id=popup_table_td_data>73365</td></tr>
                     <tr><td id=popup_table_td_data_25>25%:</td><td id=popup_table_td_data>64119</td></tr>
                     <tr><td id=popup_table_td_data_50>50%:</td><td id=popup_table_td_data_50>57656</td></tr>
                     <tr><td id=popup_table_td_data_75>75%:</td><td id=popup_table_td_data>51167</td></tr>
                     <tr><td id=popup_table_td_data_90>90%:</td><td id=popup_table_td_data>47389</td></tr>
                     <tr><td id=popup_table_td_data_min>MIN:</td><td id=popup_table_td_data>37610</td></tr>
                   </table> <table id=popup_table>
                     <tr><td id=popup_table_td_ESPTYPE colspan=2>ESP10<br><label id=popup_table_td_date>Oct 7, 2025</label></td></tr>
                     <tr><td id=popup_table_td_data_max>MAX:</td><td id=popup_table_td_data>85637</td></tr>
                     <tr><td id=popup_table_td_data_10>10%:</td><td id=popup_table_td_data>73781</td></tr>
                     <tr><td id=popup_table_td_data_25>25%:</td><td id=popup_table_td_data>64399</td></tr>
                     <tr><td id=popup_table_td_data_50>50%:</td><td id=popup_table_td_data_50>57831</td></tr>
                     <tr><td id=popup_table_td_data_75>75%:</td><td id=popup_table_td_data>51654</td></tr>
                     <tr><td id=popup_table_td_data_90>90%:</td><td id=popup_table_td_data>47092</td></tr>
                     <tr><td id=popup_table_td_data_min>MIN:</td><td id=popup_table_td_data>38035</td></tr>
                   </table> <table id=popup_table>
                     <tr><td id=popup_table_td_ESPTYPE colspan=2>ESP10<br><label id=popup_table_td_date>Oct 8, 2025</label></td></tr>
                     <tr><td id=popup_table_td_data_max>MAX:</td><td id=popup_table_td_data>84966</td></tr>
                     <tr><td id=popup_table_td_data_10>10%:</td><td id=popup_table_td_data>73080</td></tr>
                     <tr><td id=popup_table_td_data_25>25%:</td><td id=popup_table_td_data>63939</td></tr>
                     <tr><td id=popup_table_td_data_50>50%:</td><td id=popup_table_td_data_50>57708</td></tr>
                     <tr><td id=popup_table_td_data_75>75%:</td><td id=popup_table_td_data>51634</td></tr>
                     <tr><td id=popup_table_td_data_90>90%:</td><td id=popup_table_td_data>46274</td></tr>
                     <tr><td id=popup_table_td_data_min>MIN:</td><td id=popup_table_td_data>38001</td></tr>
                   </table> <table id=popup_table>
                     <tr><td id=popup_table_td_ESPTYPE colspan=2>ESP10<br><label id=popup_table_td_date>Oct 9, 2025</label></td></tr>
                     <tr><td id=popup_table_td_data_max>MAX:</td><td id=popup_table_td_data>84181</td></tr>
                     <tr><td id=popup_table_td_data_10>10%:</td><td id=popup_table_td_data>72634</td></tr>
                     <tr><td id=popup_table_td_data_25>25%:</td><td id=popup_table_td_data>63763</td></tr>
                     <tr><td id=popup_table_td_data_50>50%:</td><td id=popup_table_td_data_50>57052</td></tr>
                     <tr><td id=popup_table_td_data_75>75%:</td><td id=popup_table_td_data>51449</td></tr>
                     <tr><td id=popup_table_td_data_90>90%:</td><td id=popup_table_td_data>46150</td></tr>
                     <tr><td id=popup_table_td_data_min>MIN:</td><td id=popup_table_td_data>37953</td></tr>
                   </table> <table id=popup_table>
                     <tr><td id=popup_table_td_ESPTYPE colspan=2>ESP10<br><label id=popup_table_td_date>Oct 10, 2025</label></td></tr>
                     <tr><td id=popup_table_td_data_max>MAX:</td><td id=popup_table_td_data>83786</td></tr>
                     <tr><td id=popup_table_td_data_10>10%:</td><td id=popup_table_td_data>72500</td></tr>
                     <tr><td id=popup_table_td_data_25>25%:</td><td id=popup_table_td_data>63594</td></tr>
                     <tr><td id=popup_table_td_data_50>50%:</td><td id=popup_table_td_data_50>56834</td></tr>
                     <tr><td id=popup_table_td_data_75>75%:</td><td id=popup_table_td_data>51207</td></tr>
                     <tr><td id=popup_table_td_data_90>90%:</td><td id=popup_table_td_data>46044</td></tr>
                     <tr><td id=popup_table_td_data_min>MIN:</td><td id=popup_table_td_data>37986</td></tr>
                   </table> <table id=popup_table>
                     <tr><td id=popup_table_td_ESPTYPE colspan=2>ESP10<br><label id=popup_table_td_date>Oct 11, 2025</label></td></tr>
                     <tr><td id=popup_table_td_data_max>MAX:</td><td id=popup_table_td_data>84122</td></tr>
                     <tr><td id=popup_table_td_data_10>10%:</td><td id=popup_table_td_data>72531</td></tr>
                     <tr><td id=popup_table_td_data_25>25%:</td><td id=popup_table_td_data>63508</td></tr>
                     <tr><td id=popup_table_td_data_50>50%:</td><td id=popup_table_td_data_50>57130</td></tr>
                     <tr><td id=popup_table_td_data_75>75%:</td><td id=popup_table_td_data>51478</td></tr>
                     <tr><td id=popup_table_td_data_90>90%:</td><td id=popup_table_td_data>46116</td></tr>
                     <tr><td id=popup_table_td_data_min>MIN:</td><td id=popup_table_td_data>37502</td></tr>
                   </table> <table id=popup_table>
                     <tr><td id=popup_table_td_ESPTYPE colspan=2>ESP10<br><label id=popup_table_td_date>Oct 12, 2025</label></td></tr>
                     <tr><td id=popup_table_td_data_max>MAX:</td><td id=popup_table_td_data>83561</td></tr>
                     <tr><td id=popup_table_td_data_10>10%:</td><td id=popup_table_td_data>72187</td></tr>
                     <tr><td id=popup_table_td_data_25>25%:</td><td id=popup_table_td_data>62846</td></tr>
                     <tr><td id=popup_table_td_data_50>50%:</td><td id=popup_table_td_data_50>56732</td></tr>
                     <tr><td id=popup_table_td_data_75>75%:</td><td id=popup_table_td_data>51206</td></tr>
                     <tr><td id=popup_table_td_data_90>90%:</td><td id=popup_table_td_data>46094</td></tr>
                     <tr><td id=popup_table_td_data_min>MIN:</td><td id=popup_table_td_data>37559</td></tr>
                   </table> Link to image of plot
  • GCDW1N_SQIN.ESPF0.csv|2025-10-12
  • GCDW1N_SQIN.ESPF10.csv|2025-10-12
  • GCDW1N_SQIN.ESPFM.csv|2025-10-12



APR-SEP

#FFF68F
#33CCFF
#404040
#660066
#F00007
#66CCFF
ESP10,ESPM,ESP0
ESP10,ESPM,ESP0
Last Forecast