WMOD00277

• Contract/Permit #: 14-06-D-6467
• Title: An Operational Adaptation Program for the Colorado River Basin
• Prepared By: Lewis O. Grant, Chappell, Crow, Mielke Jr., Rasmussen, Shobe, Stockwell, Wykstra
• Date: 10/1/1969
• State: CO
• Country: United States
• Weather Modification - Doc Type: Report

The San Juan Mountains are being given primary
consideration for the initial pilot project.

2. Maps
A base map, scale 1:125,000 has been
constructed for each of the sub-basins. (Shobe, 1969).
These tase maps cmtain a variety of informa1ion inch1ding:

1. Topographic contours
2. Roads
3. Streamgages
4. Snow courses
5. Ski areas
6. Climatological station
7. Power lines
8. Fire look-out stations
9. Communication facilities
10. Etc.

It is anticipated that repeated reference will be made
to this rnap, during both the design and op€rationnl
phases of the pilot projects in the basin.

The following is a summary of the
procedure used in the construction of these base
maps:

a. A series of topographic maps scaled
1:250,000 were spliced and trimmed to
include the major areas of interest in each
of the sub-basins and extend~d some 30
miles beyond. These topographic maps were
produced by the Army Maps Services and are
published and distributed by the U. S.
Geological Survey.
The contour interval of 200 ft is
believed to give sufficient detail for this
program. Also, the 30-mile extension is
considered sufficient for locating most
instrumentation relevant to program planning
for the specific sub-areas.

b. The topographic maps were photographically
enlarged to a scale of 1:125,000 (approxi-
mately i inch = 1 mile). This scale is con-
sidered sufficient to give the desired detail
in connection 'with the location of roads,
streamgaging sites, topography, etc.,
without being excessively bulky.

c. Supplemental data of specific interest to the
project has been collected and plotted on
these base maps. The supplemental informa-
tion placed on these maps has been color-
coded to aid in the location and identification
of the specific types of information.

The following is a list of the information
plotted on the base maps and the source of the
respective data:

(1) Sub-basin outline
The outline of the sub.,basins has been
determined primarily by the elevation of
the land areas. Elevations above
10,000 ft .in the southern part of the
upper part of the Colorado River Basin
and 9,000 ft in the northern portion
have been used. These areas are
delineated by a heavy line on these maps.

(2) Restricted areas
Restricted areas, primitive areas,
national parks, wilderness areas, and
natural areas, have been outlined in red.
Most of these areas prohibit any type of
motor vehicle or instr'umentation within
their borders. Twelve of these areas,
for example, are within tre sub-basin
outline for the San Juan Mountains with an
additional nine within the 30-mile boundary
area.

(3) Topographic contours
The topographic contours at 200 ft
intervals are those enlarged from the
original maps.

(4) Roads
Major roads are part of the original maps.
A large number of secondary roads and
jeep trails have been added. These roads
are of importance for planning the installa-
tion and servicing of observational and seed-
ing equipment. The primary source of
additional road information has been the
U. S. Forest Service maps of the 19 national
forests in and surrounding the drainage
basin.
Where it is feasible, the roads are color-
coded as to accessibility; 1. e., winter
accessibility, or summer accessibility only.
The sour ce of this information has been the
U. S. Forest Service stations, highway
department in the local areas, sheriffs'
offices, etc.

(5) Streamgaging stations
Streamgaging stations have been plotted
according to the following information:

(a) Compilation of records of surface
waters of the United States to Sept. 1950,
Part IX' Colorado River Basin ,Water
Supply Paper Number 1313, U. S. G. S.

(b) Compilations of records of surface
waters of the United States, October
1950 to September 1960; Part IX,
Colorado River Basin. Water Supply
Paper NUrrD er 1733, U. S. G. S..

(6) Snow courses
The data for the location of snow depth
measurement has been obtained from the
following sources:

(a) Summary of Snow Survey Measurements,
Colorado and New Mexico, 1936-1963.
U. S. Department of Agriculture, Soil
Conservation Service.

(b) Summary of Snow Survey Measurements,
Wyoming, 1919-1967. U. S. Department
of Agriculture Soil Conservation Service.

(7) Climatological stations
The location and type of service of the
various climatological stations was
obtained from the following publications

(a) Climatological Data, Colorado. U. S.

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