WSP04023

• File Number: 8272.600.60
• Description: Colorado River Basin Salinity Control Program - Basin Member State Info - Utah
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 7/1/1990
• Title: Upper Colorado River Basin Rangeland Salinity Control Project
• Water Supply Pro - Doc Type: Report/Study

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Watershed i/ T State

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Condition

_ IIA/l/!tV .i/i{A;"aM-S~E ~t9C..C Su~watershed
:::CC/ If T.2().,J' I<~I fC

RaDle -re4P1 - ,6~/?J
Date ;i-..27-:;'tl

Acres

PSIAC

1968

-

C.HIt{ -7'

SEDIMENT YIELD FACTOR RATING

SURF ACE GEOLOGY SOILS CLIMATE RUNOFF TOPOGRAPHY
(a) (b) (c) (cI) (e)
(10) (10) (10) (10) (20)
a. Marine shale. and re- a. Fine textured; e..i~ a. Storm. of several a. Hllb peale Rowe per .0 Steep upland slopes
lated mudstones and ly <l1spersed; saline- daya' duratioa with unit area (in excess of 30'J'0)
sUtatonea alkaU"e; bllh shrink- sbort periocla of ill- b. Lafie volume of now b. Hich relief; little or
swell characteristics tense rainfall per unit area no floodplain devel..
b. Sinel. Iflin silts and b. Frequent intense con.. opment
f1.a.e sancis veeUve storms
c. Freeze-thaw occur-
rence
(5) (5) (5) (5) (10)
a. Rock. of medium. So Medium textured. 'oil L Stonns of moderate a. ..Moderate peak no_ .. Moderate upland
hardness b. Occasional rbet frsI'" duraUon. an4 intensity per unit area slopes (less than 20~o)
b. Moderately weathered ments b. Infrequent com..ective b. Moderate volume of b. Moderate fan or ttooQ.
c. Moderately fractured c. CaUche layers storms l~lOW per unit area plain development
.;;trJI/<?b ,{\'P~I
(0) (0) (0) (0) (0)
.. Massive, herd forma. a. Hllh percent ale of .. Humid climate with a. Low peale nows per .. Gentle upland slopes
tlO1lS rock fragments rainfall of low iDten. unit area (less than SGJ'o)
b. Aggregated Clays sity b. Low volume of runoff b. Extensive alluvial
c. Highin oreanie matter b. Precipitation in form pet' tmit area plains
of SnOW c. Rare runoff events
c. Arid climate. low in.
tensity storms
d. Arid climate; rare
convective storms
Factor I () //J -5-- c;- S-
value '-'
GROUND COVER LAND USE UPLAND EROSION CHANNEL EROSION AND
SEDIMENT TRANSPORT
(I) (Ill (h) (I)
(10) (10) (25) (2S)
Ground cover does llOt ex- a. More than 50'1. cultivated L \lore th... 5001. of tho .. Eroding banks continu-
ceed 2Ql'/, b. Almost aU of area inten- uea characterized by rill ously or at frequent in-
a. Vegetation sparsej little aively grazed and IUily or landslide tervals with large depths
or no Htter c. All of ..ea recently erosion and long flow duration
b. No rock in !IIunace soU burned I b. Active headcuts and de-
"--- '" 4 ../" ."Ieili/) gradation in tributary
y o"..::J.5/1l C)~ ~~d AY channels
(0) V , (0) ~~. (10) (10)
Cover not excee<:llnc 40% a. Less than 25,.. cultivated .. bout 25,.. at the are. .. Moderate now depths I
a. Noticeable litter b. 5001. or less recently characteri%~'" 10.1 rill and medium now duration
b. U treee present under- logaed &utIy or landslide erosion withoccasionaUy eroding
atory !'lot weU developed c. Leas than 5t)tf, intensive- b. Wind erosion with depo. banks or bed
ly grazed sition in stream ehannels J2;( ).4, J"c'f'
4 (~ h,1 d. Ordinary road and other
/5 (2'1.!" C~~~'ZJ"";/1
(-10) t (-10) (0) (0)
a. Area completely protect- a. No cult1vaUoft L No apparent: sllns of a. Wide shallow channels
ed by vegetaUoa. rock b. No recent loggina: erosion with nat gradients ...d
fragments, litter c. Low intensity &f'8zinC short now duration
b. Little opportunity for b. ChaMels in ma$s1V&
rainfaU to reach erodible rock. large boulders, or
material 2XtJ!It(. J.!j~57<</ well vegetated
c. Artificially controlled
channels
Factor I ).. () /0 /0
value
I Subtotal (a) - (II) 17 Subtotal (h) - (I) ;J{) I :~~~N~ -~~ = :.1-2.c.ft.fs" ml.fyr.

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