Power Supply Outlook Update

A snapshot of Northwest power supply and electricity demand

Columbia River Runoff volume forecast

Updated biweekly between December and July

January to July runoff at the Dalles Dam is at 90% of the 30-year average from 1981-2010.

For more narrative information, see the National Weather Service Northwest River Forecast Center. For more data including runoff history, see BPA Hydrology.

Figures in million acre-feet Low Avg High
Current forecast (2015-03-31) 91
30-year history (1981-2010) 53 101 159

Reservoir elevations and flows

Updated daily

Elevations for major U.S. reservoirs

Data for
Normal Full
Pool (ft)
Avg 03/30 Elevation (ft)
for last 10 years
Hungry Horse 3539.5 3561.0 3523.2
Libby NA 2459.0 NA
Grand Coulee 1253.1 1290.0 1264.4
Dworshak 1585.8 1600.0 1530.5
courtesy of U of W's DART program

River flow at key Lower Snake and Columbia dams

Data for
Avg 03/30 Outflow (kcfs)
for last 10 years
Lower Granite 64.7 59.9
The Dalles 223.9 191.0
courtesy of U of W's DART program

Power flow in and out of the region

BPA power flow data temporarily unavailable.

Acronyms and glossary

  • DSI - Direct Service Industry, like aluminum processors
  • intertie - high-voltage transmission lines connecting the Northwest to other regions
  • KCFS - thousand cubic feet per second
  • load - demand
  • MAF - million acre-feet
  • MW - megawatt
  • NMFS - National Marine Fisheries Service
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