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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Condition

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Watershed

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Subwatershed

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PSIAC - 1968

Date

Acres

(I)~ pLAItID SEDIMENT YIELD FACTOR RATING
SURFACE GEOLOGY SOILS CLIMATE RUNOFF TOPOGRAPHY
(a) (b) (e) (d) (e)
(10) (10) (10) ,.- (10) ~,t (20)
a. M.arine shale. and r~ ~ Fine textured; eui.. a. Storma of several . High peu no... per .0 teep upland slopes
I.ted mud.tones .oJ ly dispersed; .aUne- day.' duration w~~ '-b. ualt area (in excess of 3ocro)
sUtatonea alktline: hhrh ..1."'..... short periods of in- Larae volume of flow b. High reUef; tittle 01'
heu characteristics tenae rainfall / per unit area no floodolam devel..
b. Sl.ncle ifein silts and b. Frequent intense COIl o~ ""'/""(/;-
fin. sands ~ vec:tive stonns
o Freeze-thaw occur-
rence
(5) (S) (S) (5) (10)
a. Rock. of medium .. Medium textured soU .0 Storms of moderate a. Moderate peak flo_ a. Moderate upland
hardnell b. Occ::..iona1 rbck fraK" ~tUo" and I"te"sity per unit area slopes (less than 20cro)
b. Moderately weathered ments . frequent convective b. Moderate volume of b. Moderate ran or nooe:!-
e. Moderately fractured e. Caliche layers tomus now per unit areo plain development
(0) (0) (0) (0) (0)
.. Massive, hard Corm.. a. Hilh percentage of a. Humid cUmate with .. Low peak nows per a. Gentle upland slopes
tions rock lreements rainlaU of low intett- unit area (less than SlI}'o)
b. Aggregated elays sity b. Low volume of runoff b. Extensive alluvial
c. RiCh in organic matter b. Precipitation in form per unit area plains
J~: i~;','I/.-,,"INf of snow e. Rare runoff events
e. Arid climate, low in-
//i/d((\5 tensity storms
d. Arid climate; rare
(t"",:-.vfl \ convective storms
:d'r.11'fj!rtf.,
Factor t S /0 7 /0 'r-'
value Ie
GROUND COVER LAND USE UPLAND EROSION CHANNEL EROSION AND
SEDIMENT TRANSPORT
(f) (g) . (h) (i)
(10) (10) (25) (2S)
Ground cover does not ex. c.;' More than SO"!o cultivated t!) More than S()ll}'o of the .. Eroding bonks continu-
ceed 20'!. .9 Almost &1.1 of area inten- area characterized by rill ously or at frequent in-
.. Vegetation sparsej Uttle sively grazed and gully or landslide tervals with targe depth$
or no litter e. All of orea rvcently erosion and long flow duration
b. No rock in surface soil burned e Active headcuts and de.
gradaHont-. in tributary
c:hanllels ;t:?1'tttf..f'.
(0) (0) (10) (10)
Cover not exceedlnc 40'/. .. Len than 250;0 cultivated a. About 25;'. of the -. a. Moderate flow depths,
a. Notice able Utter b. SO'!. or leas recently characterized by rill and medium. now duration
b. U trees pnsent uncle,. logged gully or landslide erosioa with occasionally eroding
atory not well developed. c. Leas than SOlI}'. intensive- b. Wind erosion with depo- banks or bed
ly grazed siUon in strellm channels
};;/O /2rIO J, T d. Ordinary road and other
construction
(-10) (-10) (0) (0)
.. Area completely protect- .. No cultivation a. No apparent si&ns of a. Wide sha.llow channels
ed by ve&etat1on, rock b. No recent togging: ero_ion with flat gradients Oftd
frapents, Utter c. Low intensity gt'8zinC short now duration
b. Little opportUllity for b. Channels in massive
rainfall to reach erodible rock, large boulders, or
material well vegetated
c. Artificially controlle-d
channels
Factor, I Iv /0 d-:r ...2()
value
I Subtotal (a) -<K) 70 Subtotat (h) - (I) Lt ..5- I TOTAL I/~= 57
RATING - - - - -. - sc.tt./sq. mi./yr.

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