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1 Water Supply Forecast - THE DALLES Page 1 of 1 3/7/2013 Close Archive Data/Normals Rankings Adjustments Verification Verify All Years Help (TDAO3) THE DALLES Forecasts for Water Year 2013 Ensemble Date: Issue Date: Official Forecast with 10 days of QPF Forecast Period 90 % 50 % Forecast Are in KAF % 10 % 30 Year APR-SEP APR-JUL APR-AUG JAN-JUL with 3 days of QPF APR-SEP APR-JUL APR-AUG JAN-JUL with 0 days of QPF APR-SEP APR-JUL APR-AUG JAN-JUL Move the mouse over the desired "Forecast Period" to display a graph. Overlay ESP10 ESP3 ESP0 Data Files CSV (ESP10 / APR-SEP) Max Scale Scale To Data Scale To Last 45 Days Note: Compatible with the latest browsers (Chrome, Firefox, Safari, and Internet Explorer (ie9+)).

2 Water Supply Forecast - LOWER GRANITE DAM Page 1 of 1 3/7/2013 Close Archive Data/Normals Rankings Adjustments Verification Verify All Years Help (LGDW1) LOWER GRANITE DAM Forecasts for Water Year 2013 Ensemble Date: Issue Date: Official Forecast with 10 days of QPF Forecast Period 90 % 50 % Forecast Are in KAF % 10 % 30 Year APR-SEP APR-JUL APR-AUG JAN-JUL with 3 days of QPF APR-SEP APR-JUL APR-AUG JAN-JUL with 0 days of QPF APR-SEP APR-JUL APR-AUG JAN-JUL Move the mouse over the desired "Forecast Period" to display a graph. Overlay ESP10 ESP3 ESP0 Data Files CSV (ESP10 / APR-SEP) Max Scale Scale To Data Scale To Last 45 Days Note: Compatible with the latest browsers (Chrome, Firefox, Safari, and Internet Explorer (ie9+)).

3 Dworshak : March Runoff Forecast & Flood Control Calculation WY Percent of Runoff Forecast and Flood Control Most Probable Runoff Volume Apr-Jul 2128 KAF % May-Jul 1571 KAF % 31-Mar Flood Control Space 675 KAF 31-Mar Flood Control Elevation ft Seasonal Flood Control (assumes no shift of flood control space to Grand Coulee) Forecast Date>> Oct Nov Dec Jan Feb Mar Apr May Jun Apr-Jul Runoff Forecast First-of-Month Elev Date >> 15-Dec 31-Dec 31-Jan 28-Feb 31-Mar 15-Apr 30-Apr Flood Control Space Flood Control Elevation % whisker 20%-80% bounds 5% 1% whisker 71-yr average Spread of values around expected forecast Oct Nov Dec Jan Feb Mar Apr May Jun Dworshak Flood Control Elevations Latest water supply forecast: Mar Elevation (ft) Oct 1-Nov 1-Dec 1-Jan 1-Feb 1-Mar 1-Apr 1-May 1-Jun Flood Control Elevation Requirement First-of-Month Observed Elevation Notes: 1. The given forecast is the official Corps of Engineers forecast for Dworshak. If you have any questions please contact Jeremy Giovando ( ), or Steve Hall ( ). 2. Due to updated values for precipitation, snow or streamflow, subsequent forecasts may be different from the forecast published herein Dec and 31-Dec flood control space is fixed at 700 KAF.

4 Dworshak : March Runoff Forecast & Flood Control Calculation Apr-Jul Runoff Forecast Calculation: Variable Month Observed Value % of Regression Coefficient Marginal Runoff (KAF) A B =A*B SOI Sep Elk Butte SWE 1-Mar % Hemlock Butte SWE 1-Mar % Hoodoo Basin SWE 1-Mar % Pierce SWE 1-Mar % DWR January Inflow Jan % DWR February Inflow Feb % Intercept Mar Forecast (KAF) Data Station Sept Nov Dec 1-Jan 1-Feb 1-Mar 1-Apr 1-May 1-Jun 1-Jul Climate (Stdzd SOI) September SOI 0.20 Precipitation (monthly depth, ) Headquarters, ID Snow Water Equiv (first of month SWE depth, ) Elk Butte, ID Hemlock Butte, ID Hoodoo Basin, MT Pierce RS,ID Shanghi Suit, ID Lost Lake, ID Streamflow (monthly volume, KAF) Jan Feb Mar Apr May Jun Jul Dworshak Inflow Approval: John J. Heitstuman P.E. Chief Hydrology Section Walla Walla District USACE Peter Brooks, P.E., D. WRE Ch., Hydrologic Engineering and Power Branch Columbia Basin Water Management Division

5 Water Supply Forecast - GRAND COULEE DAM Page 1 of 1 3/7/2013 Close Archive Data/Normals Rankings Adjustments Verification Verify All Years Help (GCDW1) GRAND COULEE DAM Forecasts for Water Year 2013 Ensemble Date: Issue Date: Official Forecast with 10 days of QPF Forecast Period 90 % 50 % Forecast Are in KAF % 10 % 30 Year APR-SEP APR-JUL APR-AUG JAN-JUL with 3 days of QPF APR-SEP APR-JUL APR-AUG JAN-JUL with 0 days of QPF APR-SEP APR-JUL APR-AUG JAN-JUL Move the mouse over the desired "Forecast Period" to display a graph. Overlay ESP10 ESP3 ESP0 Data Files CSV (ESP10 / APR-SEP) Max Scale Scale To Data Scale To Last 45 Days Note: Compatible with the latest browsers (Chrome, Firefox, Safari, and Internet Explorer (ie9+)).

6 Libby : March Runoff Forecast & Flood Control Calculation WY 2013 Runoff Forecast and Flood Control Percent of Percent of Most Probable Runoff Volume: Apr-Aug 6315 KAF % % Apr-Jul 5710 KAF % % May-Jul 5165 KAF % % 31-Mar Flood Control Space 2186 KAF 31-Mar Flood Control Elevation ft Seasonal Flood Control VARQ Flood Control Implemented Forecast Date >> Nov Dec Jan Feb Mar Apr May Jun Apr-Aug Runoff Forecast First-of-Month Elev Date >> 30-Nov 31-Dec 31-Jan 28-Feb 31-Mar 30-Apr Flood Control Space Flood Control Elevation Spread of values around expected forecast 99% whisker 20%-80% bounds 5% 1% whisker 35-yr average Nov Dec Jan Feb Mar Apr May Jun Libby Flood Control Elevations Latest water supply forecast: Mar Elevation (ft) Nov 1-Dec 1-Jan 1-Feb 1-Mar 1-Apr 1-May 1-Jun Flood Control Elevation Requirement First-of-Month Observed Elevation Notes: 1. The given forecast is the official Corps of Engineers forecast for Libby. If you have any questions please contact Joel Fenolio (206) , Kevin Shaffer (206) ,Adam Price (206) , or Kristian Mickelson (206) If a prior month's forecast as published in this document is different than what was originally published in the issue month, then the earlier forecast has been adjusted to reflect updated values for precipitation or streamflow. 3. Extreme observed precipitation in October was reduced so that the forecast would reflect realistic physical conditions. Observed values for October were replaced with average values + 1/2 standard deviation from the forecast training period ( ). 4. Previous Water Supply Forecasts included flood control elevations for March 15 and April 15. As of the current update to the Libby Water Control Manual, there are no longer any flood control elevations associated with these mid month dates.

7 Libby : March Runoff Forecast & Flood Control Calculation Apr-Aug Runoff Forecast Calculation: Variable Month(s) Observed Value Percent of A QBO Jan:Mar Eureka, MT Oct:Feb Prcp Regression Coefficient Marginal Runoff (KAF) B =A*B % Libby 1 NE RS, MT Oct:Feb Prcp % West Glacier, MT Oct:Feb Prcp % % Floe Lake, BC 1-Mar SWE Fernie, BC Oct:Feb Prcp % Sunshine Village, AB 1-Mar SWE East Creek, BC 1-Mar SWE % 87% Stahl Peak, MT 1-Mar SWE % Gardiner Creek, AB 1-Mar SWE Three Isle Lake, AB 1-Mar SWE % Lost Creek South, AB 1-Mar SWE Morrissey Ridge, BC 1-Mar SWE % Hawkins Lake, MT 1-Mar SWE Intercept % % 89% 1-Mar Forecast (KAF) Data used in Libby Water Supply Forecast Climate Data SOI QBO PNA Precipitation Data Eureka, MT Libby 1 NE RS, MT West Glacier, MT Fernie, BC Snow Water Equiv Floe Lake, BC Sunshine Village, AB East Creek, BC Stahl Peak, MT Gardiner Creek, AB Three Isle Lake, AB Lost Creek South, AB Morrissey Ridge, BC Hawkins Lake, MT Streamflow Libby Inflow Volume Reservoir Elevation Libby FOM Elev Jan-12 Feb-12 Mar Oct Nov Dec Jan Jan Jan Nov Dec Peter F. Brooks, P.E., D. WRE Ch., Hydrologic Engineering and Power Branch Jun Jul Jan Feb Feb Feb Feb Mar Mar 1-Mar WY Jul-05 Oct-12 Nov-12 Dec-12 Jan Mar Apr May 1-Apr 1-May 1-Jun Apr May Jun 1-Apr 1-May 1-Jun 0.05 KAF feet Joel M. Fenolio, P.E. Upper Columbia Senior Water Manager

8 Water Supply Forecast - ALBENI FALLS DAM Page 1 of 1 3/7/2013 Close Archive Data/Normals Rankings Adjustments Verification Verify All Years Help (ALFW1) ALBENI FALLS DAM Forecasts for Water Year 2013 Ensemble Date: Issue Date: Official Forecast with 10 days of QPF Forecast Are in KAF Forecast Period 90 % 50 % % 10 % 30 Year APR-SEP APR-JUL APR-AUG JAN-JUL with 3 days of QPF APR-SEP APR-JUL APR-AUG JAN-JUL with 0 days of QPF APR-SEP APR-JUL APR-AUG JAN-JUL Move the mouse over the desired "Forecast Period" to display a graph. Overlay ESP10 ESP3 ESP0 Data Files CSV (ESP10 / APR-SEP) Max Scale Scale To Data Scale To Last 45 Days Note: Compatible with the latest browsers (Chrome, Firefox, Safari, and Internet Explorer (ie9+)).

9 MARCH 06, 2013 The official Hungry Horse Dam water supply forecast is computed by the Bureau of Reclamation on the 5th working day of the month from January-June. The MARCH final forecast of the April-August runoff volume is used to set minimum flows at Hungry Horse and Columbia Falls, and the forecast for May-Sept runoff volume is used to set VARQ flood control targets. See the 2013 Water Management Plan (Table 4) for more info. Here are the volumes for the March final forecast for Hungry Horse Inflow. Mar Jul: 2,030 kaf (103%) Apr Aug: 1,994 kaf (103%) May Sep: 1,743 kaf (103%) Jan - Jul: 2,154 kaf (103%) The minimum flows for Columbia Falls and below Hungry Horse are as follows: Columbia Falls: 3500 cfs Hungry Horse: 900 cfs -John Roache, Civil Engineer River and Reservoir Operations U.S. Bureau of Reclamation PN Regional Office, Boise, ID