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J u l y 8 , 2 01 4

J u l y 8 , 2 01 4. T O :. C e n t r ali a Ci ty Co u n ci l M e mb ers. FR O M:. S co tt B o e tt c her, S t aff , C R B F A ( 3 60/ 4 80 - 6600 , sco tt b @ sb gh - p a r t n er s.co m ). SUBJE C T:.

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J u l y 8 , 2 01 4

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  1. July8,2014 TO: Centralia CityCouncilMembers FROM: ScottBoettcher, Staff,CRBFA(360/480-6600,scottb@sbgh-partners.com) SUBJECT: BriefUpdate ofFloodHazard Reduction Activitiesin the ChehalisBasin Outreach/Education Presentation:https://www.ezview.wa.gov/site/alias 1492/34490/outreach education.aspx. May2014 PublicMeeting:https://www.ezview.wa.gov/site/alias 1492/34798/meetings_2013-15.aspx. Local ProjectConstruction Photos:https://www.ezview.wa.gov/site/alias 1492/35040/Default.aspx.

  2. (Pg. 2) SalmonRuns 120000 CohoESC CohoTR Fall-runChinook ESC 100000 Fall-runChinook TRSpring-runChinook ESC Spring-runChinook TR 80000 Winter-runSteelheadESC NumberofReturns Winter-runSteelheadTR 60000 40000 20000 0 1970 1973 1976 1979 1982 1985 1988 19911994 Year 1997 2000 2003 2006 2009 2012 11

  3. (Pg. 3) OtherFishandAquaticSpecies OregonSpottedFrog NorthernPikeminnow OlympicMudminnow Redside Shiner AndrewO’Connor LargescaleSucker LongnoseDace Sculpin(6species) WesternToad 14

  4. FloodRetentionOnlyReservoir (Pg. 4) • DamHeight= 227’ • SpillwayCrestElev.= 628 • Dam CrestElev.= 654 • Area = 860Acres • River InundationLength= 6.8mi • Maximum Storage=65Kacre/feet 27

  5. Multi-purposeReservoirOverview (Pg. 5) • DamHeight= 287’ • SpillwayCrestElev.= 687 • Dam CrestElev.= 714 • Area= 1,307Ac • River InundationLength= 7.5mi • MaximumStorage= 130Kacre/feet 29

  6. (Pg. 6) ProtectI-5withwallsandlevees ProjectCost:$80–100Million

  7. (Pg. 7) Floodproofing-StructuresAffected 55

  8. (Pg. 8) 1. Basin-WideRelationships 12

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