ALBENI FALLS DAM AND LAKE PEND OREILLE Fall Public Meeting 237 237 237 217 217 217 200 200 200 0 0 0 163 163 163 131 132 122 Aug. 7, 2017 255 255 255 239 65 53 80 119 27 252 174.59 83 36 118 110 135 120 112 92 56 62 102 130 The views, opinions and findings contained in this report are those of the authors(s) and should not be construed as an official Department of the Army position, policy or decision, unless so designated by other official documentation. 1 102 56 48 130 120 111
AGENDA Introductions Public Agencies, Commissions, and Elected Officials Hydrology and forecasts Albeni Falls Dam and Lake Pend Oreille Operations Topics of Interest 2
ALBENI FALLS AND LAKE PEND OREILLE OPERATIONS 3
FCRPS PROJECTS Albeni Falls Dam 20-25% of GCL average inflow 1 of forebay = 1 of forebay at GCL 1 unit of water produces 2 MW at site 1 unit of water produces up to 60 MW for D/S Fed projects 4
Lake Pend Oreille Dover location of transition from Lake to River. AFD is ~27 miles downstream of the lake Where lake elevation is measured
Operate top 11.5 feet of the Lake (2051 to 2062.5 feet) Spillway has 10 gates and 420,000 cfs capacity During large snowpack years not uncommon to go on freeflow ~1 MAF of storage in Lake Pend Oreille Downstream flood flow is 95,000 cfs but control point is at Sandpoint as measured at the Hope Gage of 2063.5 feet.
LAKE PEND OREILLE PRE AND POST DAM
June 7 th, 2013 No freeflow Hope 2060.6 feet Forebay 2058.5 feet Outflow 56.0 kcfs Albeni Falls June 7 th, 2014 On freeflow Dover Hope 2060.6 feet Forebay 2050.7 feet Outflow 82.3 kcfs
COLUMBIA RIVER PROJECTS STORAGE VS SPRING RUNOFF
WATER SUPPLY & LAKE ELEVATIONS Hold Summer Operating pool till Sept 18 The Apr WSF was 129% of Average Total Apr-Jul Volume was 121% of average Dam on freeflow from April 18 th to June 12 th Refilled to above 2062 ft on June 24 th Summer Operating pool reached June 24th 2061 ft end of Sept Rowing Regatta Sept 30 10
Rank PEND OREILLE - ALBENI FALLS DAM (ALFW1) Period Rankings - 1970 to 2017 APR-JUL Normal -- 11777 (KAF) Year Period Volume (KAF) Percent of Normal Lake PO Reached 2062 ft 1 1997 21201.86 180 May 16 - FF 2 2011 19944.00 169 June 7 FF 3 1974 19784.44 168 June 15 - FF 4 1972 18347.11 156 June 1 - FF 5 1971 17633.85 150 June 3 - FF 6 2012 16595.00 141 June 26 7 1996 16446.50 140 June 27 8 1982 16263.40 138 June 20 9 1976 15969.07 136 June 17 10 1975 15667.25 133 June 23 11 2014 15511.00 132 June 26 12 1991 15194.20 129 June 23 13 2002 14646.72 124 June 29 14 2008 14482.40 123 July 4 15 1978 14453.24 123 June 26 16 2017 14258.83 121 June 24 17 1990 14080.98 120 June 25 18 1981 13871.10 118 May 24 - FF 19 1999 13709.84 116 June 22 20 2006 13473.10 114 June 19 21 1980 12626.73 107 May 28 - FF 22 1989 12203.66 104 June 15 23 2009 11910.05 101 June 25 24 2013 11837.00 101 June 27 25 1979 11657.83 99 June 9 Ranked Volumes into the Pend Oreille the last 47 years FF Freeflow Only years that refilled before June 1 were years Albeni Falls was on freeflow Refilled in early June were years either on freeflow or dry years 11
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EARLY JUNE PRECIPITATION EVENT 13
EARLY JUNE PRECIPITATION EVENT 14
INFLOWS TO LAKE PEND OREILLE 15
RELEASES FROM ALBENI FALLS DAM 16
THIS UPCOMING FALL AND WINTER Lake elevations Above 2062 ft through Sept 18 th Target 2061 ft on Sept 30 th Winter minimum elevation 2051 ft mid-november Expect low flows in August since conditions have dried up dramatically Bank Stability work Riley Creek part 2 Starts in mid-december for 2 to 3 weeks limits Lake elevations to 2052 ft Winter Elevations minimum 2051 ft No limitations on Lake Pend Oreille fo FWPO
UPDATES AND LAKE LEVEL QUERIES For emails regarding release changes and Lake level updates email Joel.M.Fenolio@usace.army.mil Logan.J.Osgood-Zimmerman@usace.army.mil General Queries call (206) 764-6702 18
ALBENI FALLS MASTER PLAN Will provide guidance for future development and maintenance of recreation and wildlife management areas on Corps Albeni Falls Dam lands A planning document that deals in concepts, not in details of design or administration Plan is flexible and subject to revisions as dictated by changing needs and conditions. What the Master Plan does NOT do: Does not address hydropower operations, reservoir level management, regional water quality, shoreline management, or the operation and maintenance of project operations facilities (i.e. dam, powerhouse, and/or spillway). 19
ALBENI FALLS MASTER PLAN This fall, a draft Environmental Assessment and the draft Master Plan will be made available for a 30-day public comment period. (~ Nov. 2017) Topical areas for substantive Master Plan comments: Conversion of dirt trails or roads to paved surfaces - for mobility, dust control, etc. Installation of signs along trails for interpretation - creation of Nature Trails Full electrical hook-ups at campsites Construction of additional fishing piers in parks or wildlife management areas without one Installation of lights along campground trails More shower houses Create off-leash dog play areas For more information and to be added to the AFD Master Plan email list, please contact Beth McCasland at AlbeniFalls.MasterPlan@usace.army.mil 20
QUESTIONS? 21