Flow and Spill Data




Spill Season Update

  • Spill Season Update (Graphs daily actual spill
    versus court order spill, April through August)



Hourly and Daily Average Flow (Daily average is midnight to midnight)

IMPORTANT NOTES:

  • Data for current month are not finalized and may change.
  • Finalized data for previous month are received on the 7th of the current month.


Data Available

  Hourly Flow Daily Flow
Site Start Date Start Date
Bonneville Dam (BON) 1974-01-01 1964-01-01
Brownlee Dam (BRN)   1974-11-01
Chief Joseph Dam (CHJ) 2001-01-01 2001-01-01
Dworshak Dam (DWR) 1974-01-01 1974-01-01
Grand Coulee Dam (GCL) 1974-01-01 1974-01-01
Hells Canyon Dam (HCD)   1974-11-01
Hungry Horse Reservoir (HGH) 2002-01-01 2002-01-01
Ice Harbor Dam (IHR) 1974-01-01 1964-01-01
John Dam Dam (JDA) 1974-01-01 1968-04-22
Lower Granite Dam (LGR) 1975-04-01 1975-04-01
Little Goose Dam (LGS) 1974-01-01 1970-03-01
Libby Reservoir/Dam 1998-12-31 1998-12-31
Lower Monumental Dam (LMN) 1974-01-01 1969-04-01
McNary Dam (MCN) 1974-01-01 1964-01-01
Priest Rapids Dam (PRD) 1974-01-01 1974-01-01
Rock Island Dam (RIS) 1974-01-01 1974-01-01
Rocky Reach Dam (RRH) 1974-01-01 1974-01-01
The Dalles Dam (TDA) 1974-01-01 1964-01-01
Wanapum Dam (WAN) 1974-01-01 1974-01-01
Wells Dam (WEL) 1974-01-01 1974-01-01



Page last updated on: April 1, 2015

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