WSPC01774

• File Number: 7630.650
• Description: Wild and Scenic - Yampa River
• State: CO
• Basin: Statewide
• Date: 1/1/3000
• Author: Unknown
• Title: Soil Associations of the Study Region - Moffat-Routt-and Part of Rio Blanco Counties - Colorado
• Water Supply Pro - Doc Type: Report/Study

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002188

Pergelic cryeepts,. and Pergt,l.ic cryochn,pt.C' <It'pI' J w(' 11-dr3 ined

soils formed in sedimentary rocks and are found over residuum. Rock

ouicrop consists of exposures of bare rock.

Sediment yield from this association is very low, less than 0.1 acre-

feet/square mile/year. These soils have a poor potential for low buildup.

Their principal limiting soil features are steep slopes, permafrost, and

the presence of stones and rock outcrop. The potential for frost heave is

not rated, but mass wasting is prevalent; deep cuts along uphill side of

roads can cause exposures of bare rock, thaw the permafrost, and cause the

slope to fail. Large volumes of coarse fragments cause excavation problems;

opportunities for topsoil are poor because of steep slopes and coarse

fragments, These soils are used for woodland, recreation, and watershed

and wildlife. Reclamation potential is poor due to slope, coarse fragments,

and a very short growing season.

Mollisols

Aridic Argiborolls, clayey-Aridic Haploborolls, clayey Association,

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Association #52, (51,584 acres)

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This association consists of sloping to steep soils on mountain

slopes (9-25 percent slopes). Elevation ranges from 6,000-8,000 feet.

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Average annual precipitation is 14-20 inches; the moisture regime is

ustic. Average annual soil temperature is less than 470F, and the dif-

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ference between summer and winter temperatures is more than 90F, frigid;

frost-free season is 100-130 days.

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