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~ ~ (~ .~ ~ ~ ~ ~ ~ ( ':' \: 2. I. . Hydrographs \'\ " "', (' Skagit River Gage at Concrete Ii 9v 24 Feet or 40 Feet or 30 Feet or 40,000 C.F.S. 147,000 C.F.S. 75,000 C.F.S. • , I ! ! i 25 December 26 December 26 December ... - .......... ,., ...... ,.,... ~ .,...- -_. '""F' _ i 150,000 , ...... i 45 ,.., 130,000 i i ' - - .. _.-._._. -- .. _- -m 40 " /' C/) u.: .. u. o 110,000 I c 1\ . I· I \ e - - .. - .- :: 35 \. E I .£: C) I '= .sa .,.., - 90 000 t d ' " I t· I ""' 30 ctS ' a: Ij Q) C) 70,000' I I u:: 25 ~ I DISCHARGE 50,000 1 1:V STAGI! HYpROG~APH HYDRO GRAPH I I 20 28 25 26 27 25 26 27 28 December December

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~ _~.~. -.~' .~- ',~_~'~ ~.'.~:,: :'.~' ~ .~ ..r. " ,. / ,q i \ i Flood Control Responsibilities i " NATIONAL WEATHER SERVICE - SEATTLE Forecasts weather and river conditions CORPS OF ENGINEERS -- SEATTLE :za •• ______ ..... ,_" _. _ .• _ •• 0" ... , •• ___ ..... Monitors weather, river ang re$ervoir$ Provides regulating instructions to dams PUGET SOUND POWER & LIGHT AND SEATTLE CITY LIGHT -._.L ± ". "jJ!!Jiitt_, ad t 1 "iL ~ ... ... j"' U .' .' -- ."._.- ... ___ '~ ____ •. .. __ ,_ •. _.'._.,_~ __ Maintains flood storage $paGe Operate dams - gate changes SKAGIT COUNTY PUBLIC WORKS DEPT. m-" .. , .. - ..... ,,- - ..... -. ".,. Provides 'flood information to the public Coordinates flood emergency activities I ,

~ ~ 1.<;.:; . I Reservoir Regulation Guidelines "-\ & for Flood Control (--' Regulate flows forecast ,to exceed 80,000 c.f.l. (32.2 tHt) at Concrete • . • Reduce outflow from dame (Ixet"t minimum pow.r flowI) Store floodwater in reservoir • e stored water when fltw ~t' • Rel ••• QenC?r,te rec.d •• • Maintain reealiion .t Coner,te I i ) , /

~ ~ ;~:- -.-.-~.,. ~ ~ .~ ~ ~ ~ ~ ~'-'f ~ ~ ""'" Ross Lake and Dam' II. \ I Normal Full Pool £ M ..,.., • ~ •• ...,. ...... .rAw. __ nwxw.x.. .--n ~.-r.w.r4Y4JlWAWN I £ •• ~ • • • • • ~. •• ~ • • • • •• • ..... • • .. .... .. ....... .... '" I I " j i I Flood 1 i Minimum Flood Storage ! Storage Pool Space 10.4 Feet I 1ii l I .- c: c: o 1590 jjj Q) j • 1585 1580 October . November. December.' January February March + 1980 1981

... ~ -.~-.-.- "~, ;I~ -~.- ~". ~_ ~ ~ ~ ~". ~ .--.. ." ' · / 1 \ ' ' ' - 1 Baker Lake and Upper Baker Dam '\ , : , '" j "- 730 .1 r I ! 725 +.. .. ~ I • ............ .........v ---.. II!- ..... • .... V" Normal Full Pool A v •••• • .............. • -- 1 'V:.at • ~ 720 Flood Storage J Space 71& 16 Feet .5 _._._ Mhiimum Flood I Stera§e POOl i710 .. -_.".,.- .. - ~ ..... ... -I--.- .... ... ~., . Q) 705 700 ,\,; .'.A 895 ... 690 '. October November December January February March I 1980 1981 --.- ... ... - "._----<--------- ------.- .... _··_--_ .. _-_ .. _· .. ·--1·------------_· __ ·_------- .4 __ • ,_" •• _____ ••• ____ • ....

, ~ ~ ~ ~o ~,. ~ ~-, ~ . 1 ",1."',., . .' r'" . _ (' . . . 13. ') ~ \ .. Skagit River at I , Ross Dam I \J December 1980 Flood u;* * en cIS L:.. us::. U"- e g e ~ go eO __ U Q) U q U 0 ..... 0.. ..... 0_ 0) ca ca 0) ca . 50 en u.: 40. d Natural "§ I Inflow A30 i , 1 I .- c: .\ j I S 20 ns 1 ex: 10 0 f u:: t 0 25 30 26 27 28 29 Time in Days

o~ -~- J~, ~I ~ ~ ~ ~ ~ -.-~.-.~-.*-.-. .-~ ~ ~-. ~ ~ ~, ~ ~ ~ ~" .,-.-~-~ ~ /1 , . . -- .... ---_ .,._----_._--.. - - .. ... _.. - .- .. ... ( . Skagit River at·' . Upper Baker Dam i (' " December 1980 Flood i . I i ! I j e! c4 Q) Q) c4 Q) LL; Q) LL; Q) Q) u.... .... u .... . 0 0 0 c: c: c c: Q i 00 ,¥o cO i qU ctIU qU I. I 0- o...Q)+-, 0'> ctI C'tI 0'> ctI I -, . __ . -- ." ..... -_J. 50 - ... " .. _w_ " .. l en 40 ....... - . (,) 11 Natural .§ 30 J \lnflO A I t I I c:: I .- 20 I _I 't \.J ~ a: .' ••• .-. • •• ?' n A ' ~r 1 ... <,." r .• ·.~· • __ " .. M 10 Dam ~UtfIOW j o I . . . J"""" 1 V.-- u: ,.... 1 o I - - - _._----- - 28 25 27 29 30 28 i Time In Days i I. -= ._-- ... ... ... .,.

~ ~ ~ ~ ~ ~-=- ~I\ ~ I-.·~C"'.~,·.~,.~ ~:-: ,~ -~.".-.- ~ :',' Skagit River at '\ ., Concrete .,,' .\ ~ ~ . December 1980 Flood . '. " ., ,e' ':'200" . -- 46 0 " . r • ,mZ'''-<-' - ...... upon. pi I I( , I i. e In + t ... " I 41.5 180 ,..-- .. 1- Natural lUI Flow en i , to t=~-=-~. o. 1 38.5 La. .. . ...... =;=;;:;:;-- ... •• ·I __ ___ .-:-:-:-~ u •• __ • _ .; . . S I .. 30.81 . Il:' 10 Observed Flow I =>=n '"' > .;= < < cc:: tIf\I o 28 .25 27 ( Time In Days , " " .. "------- -----------------_ .. __ . ---"'" " r--

.~ ~. .,.~ ". Skagit River at Mount Vernon December 1980 Rood fe .,. ..... - -'- '",........ '_,,- .. - "iii·.m 38 0 180 r + .. -~ __ .. \=~.+, . a ¥ c4 120 .. M.8 u- \) ti Q) lL ..... E ,... ':.E ao.O 80 c .- .~ :! Observed I .! Q) t1. Flow 0') • co (!) o· 21.7 ti:: 40 ~ r o I I 28 . 21 25 28 29 30 ' 0" I - J . I Time in Cays i l / , - .... '---" .-._--- ._.-/" - ....... . ,.(

':>;Mt!·· ". .. ".'" G) .. ~.- ~ ~Observed .r:'-:-.~7'.~"·, ~ ~ ~ ~ ~ ':~,t;~;.~ -.-~-.,., .. ,.~:." .. iif, ''1 :,.,:;0'''''''' ;." l. <,I ,"f., " t,:}. ':,i ~ •. , "~':'<": Ai. " .lJ .1, '.' ,.\" . i' o < , • "'. '." .} ,I,,". . I, '. .: .. : '. . ·/7~· Skagit River at Concrete .. · . , . En.cts of Reservoir Storage . ";:i .' '-\ I , : 210· ,. ,. i'- J 45 " 180 tv - 150 Natural 40 en rlow LL: <J § 120 c: .. ' 35 t- Flow Control 01 0) om I 10 f='t FlOW \. , .. .. _--' =- ~ .......... .- ~ ---:- "" ... J: Q) C) I t'O 30 0 eo 25 3() .,."#'" , 20 i , 1 " " I!!'!' 1 , " !!!, . . - . 1970 1975 1980 ' Water Years , + .. ' ..... '------ -.-.-----.-- - ..• . •

i~ ~-~- ~', ~'1 ~, ,;\~ .:~ -::J ·w.( ..... o .. ;'l: I .: 1 -t.. " ." Summary,'>, .~ ., h.\ "::;1;"\)"'" "', "';r.. . ' '.' . . . ';':'" ci, ~' IS t .. ti " •• flowi above 90,000 c.f .•.. : ~' Corps ,eQ,ulat ,,,- .', (32.2 ft.) It Coneret. ••• ftow. below 90,000 c.f.l. •. . Dam. lncldtfttlw '.,VI ". e" Oams provldt 'flood domaC)1 reduction' ., . .. , '.i ," e But ~am. COft"ot".Uminafe the possibify of floodino . to 1'\. 1' .. . .....