PERMFILE44366

• Permit No: M1987012
• IBM Index Class Name: Permit File
• Doc Date: 2/4/1987
• Doc Name: REGULAR 112 PERMIT APPLICATION FORM
• Media Type: D
• Archive: No

t UNI'~TfO STATES DEPARTMENT OF AGRICULTURE
Soil Conservation Service. Colorado
Technical Guldc RANGE SITE N0. 281
Section 11 E Field Office
August 1975
RANGE SITE DESCRIPTION
for'
MOUNTAIN OUTVASH
Land Resource Area: High Intermountain Valleys (51)
A. PHYSICAL CHARACTERISTICS
1. Physiographic Features
This site occupies broad alluvial fans formed by outwash from
high mountain ranges. In many places, the fans have coalesced
to form a smooth plain that feathers out to a flat valley floor.
In some places, they form low benches or terraces above stream
courses. There are some minor undulations caused by small drain-
ageways, but most of the site has smooth topography and some is
C ~ nearly level.
Slopes are mostly 0 to 3$ and are not significant to plant growth.
Elevation Is 7600 to about 8000 feet.
2. Climatic features
Average annual precipitation is 7 [0 9 inches. Of this, 55$ to
GO$ falls between May 1 and September I, mostly from hard, spotty
thundershowers of short duration In July and August. May and June
are normally dry. Vide seasonal and yearly variations are common.
Most major plants make their main growth between mid-May and late
July, but growth may extend into September. Some of [he main
grasses start earlier and complete growth by mid-June. There may
be late re-growth on some of these.
}. Native (potential) Vegetation
A fairly uniform stand of grasses with a few low shrubs glue the
site a typically smooth appearance. Blue grams is usually the most
abundant grass. But taller grasses, mostly cool-season species,
make up a significant part of the annual production, Of these,
squirrel tall, western wheatgrass, and Indian ricegrass are most
important. There are usually small amounts of needle-and-thread,
r sand dropseed, Fendler three-awn, needleleaf sedge, and slimstem