J V\Tet""agencyf! - Winberry and Lower Fall Creek Wa-~e~shed Analysis .~ \.Vinberfi'/l~o~er tall Creek \.Valershed Anal-ysis Inleragen(..'{ Core Tea1n Rick Cope Team Leader Geology/Soils Specialist Sue Baker Recrealionall·bresler L-ynn Larson rbresl Ecologist Laurie Bernstein r1sheries Biologist Kirk Lunstrwn \.Vildlife Biologisl Jenn-y Din1Hng Botanist Bob Magne Fisheries Biologist Rand-y Green Fire;1·uels Spedalisl l<.tis \.Vard H-ydrologist George Hill Park Ranger Sonja \.Veber Editor/Graphics Contributors .lon Belcher GIS Mar-y Lee Gra-y Editor Tom Jackson GIS "Val Rogers H-ydrology Technician Larr.y Tennis Transportation Spedalist Larr.y \.Veddle \.Vildlife Technician K.ds \.Vobbe GIS TABLE OF CONTENTS INTRODUCTION 9 CHAPTER 1 12 PHYSICAL DOMAIN ·············································•····························································· 1 2 GEOLcx:J.Y ····································-············································~·-·····································12 EROSION PROCESSES ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 12 HYDROLcx;Y ••••••.••••••.••••••••••••••••••••••••.•..••••••.•••.•.••••••.••••••••••.••.••.••.••••.••.••••••••.•..••••••...•••••• 13 WA'TER QUAI. .ITY •••••••••••.•••••••••••••••••..•.•.••.•••..•.•.••.•.•.•••..•....•..•.••••••.•..•.••.••••••.•.•.•••••.•.••••••. 13 RO.ADS ···························-·································································································14 BIOLOGICAL DOMAIN······································································································· 15 l'ERRES1RI.AI... •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 15 Vegetation ....................................................................................................................................... IS Fire and Fuels ................................................................................................................................ IS Botany ............................................................................................................................................. J6 Wildlife ............................................................................................................................................ J6 AQUATIC •.••.•••.•.•..••..•.•...••••••••••••••.••.....•••........•••.••.••..••••...•..•..••••.••••..•.•.•.•.•.••...••..•.•..••.... 17 Anadromous Fisheries ................................................................................................................. 17 Aquatic Habitat and Other Fish Species .................................................................................. l7 SOCIAL DOMAIN ·······························································································•··············· 18 CHAFTER2 21 lSSLTE 1 : TERRESTRI..AI.. HABIT AT ······················································································ 21 Relevant :Conditions and Processes .......................................................................... 21 Key Questions ............... , ......................................................................................... 21 lSSlJE 2: RIPARIAN" HABIT AT···························································································· 22 Relevant Conditions and. Processes .......................................................................... 22 Key Questions ......................................................................................................... 22 ISSL'E 3: AQUATIC HABITAT A.l\TI SPECIES •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 22 Relevant Conditions and. Processes .......................................................................... 22 Key Questions ......................................................................................................... 23 Issu'E 4: WATER QVALITY A..."-TI QUA.t"'TITY •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 23 Relevant ·Conditions and Processes .......................................................................... 23 Key Questions ......................................................................................................... 23 Isst.TE s= n~ER HARVEsT ..•••..•..•.••.•...•.....•....•.........•......•..•.•.•......•....•.......•.•.....•••.•.•....•. 24 Rele..,ant Conditions and Processes .......................................................................... 2~1 Key Questions ......................................................................................................... 2M1 Isst.JE 6; RESERVOIR ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 24 Rele..,ant Conditions and. Processes .......................................................................... 2-4 Key Questions ......................................................................................................... 25 lSSL'E 7: HtJMAN USES ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 25 Relevant Conditions and Processes .......................................................................... 25 Key Questions ......................................................................................................... 25 1 Winberry/Lower Fall Creek Watershed Analysis CHAPTER3 26 PHYSICAL DOMAIN ........................................................................................................... 26 GEOLc:x:;.Y •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••.•••••••••••••••••••••••••••••••••••••.•••••••••••••••••••••• 26 Soils ......................................................................................................................... 27 Erosion .................................................................................................................... 29 Reservoir .................................................................................................................. 33 HYDROL<:><:;Y ············-·····································································································-34 Stream Flow Conditions .......................................................................................... 34 Reference Conditions fPre~Reservoir) ........................................................................... 34 Clll!'1'ent Conditions fPost-Resersroir) ............................................................................. 35 Average Discharge ... ..... ... ... ... .... .. .. ... .. .... ... .... ........... .. .. .. ......... .. ..... 3 5 Reference Conditions fPre~Reserroir} ........................................................................... 35 Current Conditions (Post-Reservoir) ............................................................................. 37 Instantaneous Peak Flow ......................................................................................... 37 Reference Conditions fPre~Reaervoir} ........................................................................... 37 Current Conditions fPost-Reserroir) ............................................................................. 38 Minimum Flow ....................................................................................................... 39 Ra.infall/RunoH 'Characteristics .............................................................................. 39 Reference Conditions ..................................................................................................... 41 Clll!'1'ent Conditions ........................................................................................................ 41 W ATIR QU&I1Y ......................................................_ ...•...••..•••......•.•.•••..••••••..•.•......•.•...... 43 Reference Conditions {Pre-ReserYoir) .................................................................... 43 Currtlnt Conditions (Post-Reservoir) ...................................................................... 44 Aesthetics .............................................................._. ....................................................... 4 6 Salrnonid Spawning and Rearing.............................................................................. ~ .....• 46 Temperature ....................... ···.· ................................................................................... 46 Flow Modification .............................................................................: ......................... 49 Sediment.................................................................................................................... 49 Resident Fish and ./iquat.ic Life ..................................................................................... 50 Dissolved Oxygen and pH...................... .-................................................................... 50 Temperature .............................................................................................................. 50 Turbidity/Suspended Sediment................................................................................... 51 -pJ:':tter Contact Recreation, Boating, and Fishi.ng ........................................................... 51 Water Supply................................................................................................................. 51 Thk"\i'SPORTATION •.•••••.•••..••.•••••.•••.•••••••.•••••••••••.•••.•••••••••.•••.••.••.•.••....••.•.•.••••••.•••••.••••••••.