FLOOD01056

• County: Jefferson
• Title: Floods in the Bear Creek Watershed
• Date: 1/1/1990
• Prepared For: Jefferson County
• Prepared By: USFWS
• Floodplain - Doc Type: Flood Documentation Report

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'!hh llrecl1l1~a1;.1on re,11lted in fioods in Oold Spring Gulch
Vernon Oreek which cl'IUlIld the nood on Boar Oreek. The latter
anove Cold Spring Gulch. the 'Ilp;Je1' of the two tributaries men-
"ae not in the nood I!.Ild Uper1enced onl;r a small r1ge.

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"ltith1n eo short tlllIe etter the need. ~lop...arlla. dlltll%'lll1natlonl ., "
of tohe peak no". "ere lIlI!Ide at oontrolling }lOints. ~ ~

Cold Spring Gulch. A tributary ot i1elU' Oreek. ..hich lial in the . t""
area of highest preci-pita.t.1on. in si4- seo. 25. T. ~ s.. R. 71 "!t.. hnd a ~ ~
peek dhoharge ot 9.000 !lecond-teet trOQ n dral~e area 01' 4.43 8,!uara ~ '
miles. or 2.010 ,/.!Cond-feet per 8QUa". mile. A. emll gulch. 11 tributary , \',
to Cold Spring GIlleh between this .pont of ceasurement and the confluence 2~:
of Cold SpringGuleh !llld Ilaar Cre9k. A. slcme-lU'ea measurement of this ,\ .'"
€;Uloh a.t ita mouth:'near ths llO:thwe3t corne~ ~,~~~.~.__~.~_s..,R.._70,i._~, ,
showed a 'Penk dhcnarge of 2.050 llecor.d-feet,per square mile. It 1reS '
e;pr>arent frolll tho waterlll!\l:lia and erosion at the mO;J.th of. this tributary
gulch that ih ,)oak Oame before thlJ pe!1k on Cold S-"lring: Gulch. eO that
the addition of the ho peaks don not gin the pe..:k no... of Cold Spring
Gulch. As the tributary ~ch hall a short. MlTOll'. ,steep drainaee area.
1t lrDpearll that itll no. was relatively =U at the time of the peak in
Cold Sprin;;: Gulch. llUi the noli' of 9.000 ascond-teet. as measured.
:repreaentll the peak now. .

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The peak diecnarge of Bear Creek at UorriaoD. wOVe the JIlOUth
of Ut. Varnon Creek. 1I'a9 6.200 aeccne-feet from 164 SquArS miles. or 37.3
.econ~.l.'Il11t per equare mile. The !i!Jnarent dhcreyency between the pe-:Ut
on Cold Spring Gulch &nd that on Bear Creek at !.:orrison. 1a urAoulltddly
due to t."lJ.e 1'<'..ot that the peak dhohare;e on tho for:::er was of very lIhort
duration and flattened out in the intervening channel betwoen the IllOUth
of Cold Spring Gulch ar~ llorrison. a'div'enca of about 5 miles. Ute Vernon
Creek in s;1~- seo. 23. T. 4 s.. R. 70 VI.. 2 mil ell abOTS Morrhon. b.--:<d a ;)t.I'.k
dis~~arg9 of 3.900 second-feet trom a drainage area of 5.7 s~~e miles, or
, 684 ll!lQomi-feet per squnre mile. In sec. 35. T. 4 s. .:a. 70 fl.. halt !\
mile above the mouth at llorrisollo the pc-'\k discr.arge 1mll 9.230 second-feet
trom a drairu:.>ge Rae. of 9.45 squua r::ilcs. or 977 Mcond:-:t'eot 1ier squr..re
Illile. From eta.tamantll b;r loc!ll raaids:lta it ~l'e:1l'll that the ,leek di!/"
omrge on ut. Vernon Cro"k at Morrison occu.n-ed aO'Jut 7100 p.m.. end tb..."t
on Boar Creek at Horrison about 71 yJ p.m. It h impossible to state the
length of tir.lEl tnat the pellk disoharge l!lsted at Uorrhon. but severs.l
100;,,1 re3idontu stllto tr.ct it Will! about l~ to 2 ,ho':lrs froQ the t1co t.ne
flood from Mt. Vernon Creek reached M~risonuntil it ha~ subsided ~~ti-
ciently to pareit travel on the cnin street evan tho-af,h water wag ltill
running OV<11" the street all debris h<"d. blocked the Ctllvert thro'lg,il. which
the flow or Ut. Vernon Crefllc nor!:l.'111;r passes.

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