ALBENI FALLS DAM AND LAKE PEND OREILLE

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1 ALBENI FALLS DAM AND LAKE PEND OREILLE Fall Public Meeting Aug. 7, 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

2 AGENDA Introductions Public Agencies, Commissions, and Elected Officials Hydrology and forecasts Albeni Falls Dam and Lake Pend Oreille Operations Topics of Interest 2

3 ALBENI FALLS AND LAKE PEND OREILLE OPERATIONS 3

4 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

5 Lake Pend Oreille Dover location of transition from Lake to River. AFD is ~27 miles downstream of the lake Where lake elevation is measured

6 Operate top 11.5 feet of the Lake (2051 to 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 feet.

7 LAKE PEND OREILLE PRE AND POST DAM

8 June 7 th, 2013 No freeflow Hope feet Forebay feet Outflow 56.0 kcfs Albeni Falls June 7 th, 2014 On freeflow Dover Hope feet Forebay feet Outflow 82.3 kcfs

9 COLUMBIA RIVER PROJECTS STORAGE VS SPRING RUNOFF

10 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

11 Rank PEND OREILLE - ALBENI FALLS DAM (ALFW1) Period Rankings to 2017 APR-JUL Normal (KAF) Year Period Volume (KAF) Percent of Normal Lake PO Reached 2062 ft May 16 - FF June 7 FF June 15 - FF June 1 - FF June 3 - FF June June June June June June June June July June June June May 24 - FF June June May 28 - FF June June June 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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13 EARLY JUNE PRECIPITATION EVENT 13

14 EARLY JUNE PRECIPITATION EVENT 14

15 INFLOWS TO LAKE PEND OREILLE 15

16 RELEASES FROM ALBENI FALLS DAM 16

17 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

18 UPDATES AND LAKE LEVEL QUERIES For s regarding release changes and Lake level updates General Queries call (206)

19 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

20 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 list, please contact Beth McCasland at AlbeniFalls.MasterPlan@usace.army.mil 20

21 QUESTIONS? 21