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CONTENTS

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15

Letter of transmittal..

Letter of the Chief of Engineers, United States Army--

Report of the Board of Engineers for Rivers and Harbors...

Report of the District Engineer:

Syllabus..-

Authority

Prior reports.

Geographical description.

Topography

Geology

Stream slopes, channel capacities.

Soils...

Vegetal cover

Climate

Maps..

Population.-

Natural resources.

Agriculture..

Irrigated lands

Occupations and industries.

Railroads.

Highways.

Airport

Bridges

Precipitation

Snowfall...

Meteorological characteristics.

Stream gaging stations..

Run-off...

Floods of record

Flood frequency.

Design flood criteria.

Maximum probable flood.

Extent and character of flood area, general.

Extent and character of flooded area, Trinidad.

Extent and character of flooded area, agricultural and improvements.

Extent and character of flooded area, crops.

Extent and character of flooded area, property values.

Flood damages, general.;

Flood damages, Trinidad.

Flood damages, agricultural.

Flood damages, caving banks.

Flood damages, irrigation...

Existing projects

Improvements, Trinidad.

Improvements, irrigation.

Other improvements.

Improvements desired.

Surveys.-

Flood problems.

Investigations and studies for flood control.

Local interests-Plans of improvement.--

Reservoirs in lower Purgatoire Basin.--

Channel rectification, levees and bank stabilization for flood control.

Water power and municipal supply -

Sopris Reservoir for flood control and irrigation.

Sopris Reservoir for flood control only ---

Sopris Reservoir for food control and irrigation-Channel improve-

ment through Trinidad for flood control.

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1. Tributaries of Purgatoire River --

6

2. Purgatoire River, river slopes and minimum channel capacities -

8

3. Average monthly and annual temperatures and maximum and mini-

mum recorded temperatures-

9

4. United States Geological Survey quadrangles covering Purgatoire

River Basin...

10

5. Trend of population in Purgatoire River Basin.

10

6. Population of principal communities in the Purgatoire Watershed... 11

7. Area overflowed (acres)

17

8. Pertinent data on the five reservoir plans suggested by local interests.-

23

9. Engineering features of recommended channel improvement at Trini-

dad, Colo...

27

10. Estimated first costs and annual charges for recommended plan of

improvement at Trinidad:

Costs..

28

Annual charges -

28

11. Summary of average annual benefits, Purgatoire River flood plain.. 31

List OF APPENDIXES MADE IN CONNECTION WITH REPORT OF THE DISTRICT

ENGINEER

(Only maps Nos. 1 and 9 of appendix A are printed.)

Appendix

A. Maps and Charts:

Map No.

1. Watershed map.

2. Valley details (sheet No. 1).

3. Valley details (sheet No. 2).

4. Valley details (sheet No. 3).

5. Valley details (sheet No. 4).

6. Valley details (sheet No. 5).

7. Valley details (sheet No. 6).

8. Stream profile (sheet No. 1).

9. Recommended plan of improvement (general plan).

10. Recommended plan of improvement (plan and sections),

11. Recommended plan of improvement (profiles).

12. Recommended plan of improvement (structural details).
Chart No.

1. Economic limits of improvement (city of Trinidad).

B. Hydrology.
C. Economic data.
D. Plans of improvement not recommended.
E. Resolution of the city council, city of Trinidad, Colo., adopted March 8, 1943.

13

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WAR DEPARTMENT,

Washington, January 24, 1944. The SPEAKER, HOUSE OF REPRESENTATIVES.

Dear Mr. SPEAKER: I am transmitting herewith a report dated September 8, 1943, from the Chief of Engineers, United States Army, together with accompanying papers and illustrations, on a preliminary examination and survey of Purgatoire (Picket Wire) River, including Long Canyon, Colo. This report was authorized by the Flood Control Acts approved on June 22, 1936, and June 28, 1938.

The Under Secretary of War advises that the project, if authorized, would require approximately 2,400 tons of steel, a substantial amount of construction equipment and manpower, without being essential to, or of any presently indicated value to the war effort. There is no objection to the submission of this report, but this Department does not approve of the submission of any estimate of appropriation or the initiation of any construction on this project until after the war.

The Bureau of the Budget has been consulted and advises that while there would be no objection to the submission of this proposed report to the Congress, in the absence of evidence showing that the proposed works are necessary to the prosecution of the war, the submission during the present emergency of any estimate of appropriation for the construction of the project would not be in accord with the program of the President. Respectfully,

HENRY L. STIMSON,

Secretary of War.

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