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SAN CARLOS IRRIGATION

PROJECT, ARIZONA

REPORT

TO THE

SECRETARY OF WAR

OF A BOARD OF ENGINEER OFFICERS,
UNITED STATES ARMY, UNDER INDIAN
APPROPRIATION ACT OF AUGUST 24,
1912, ON THE SAN CARLOS IRRIGATION

PROJECT, ARIZONA

FEBRUARY 25, 1914.-Referred to the Committee on Indian Affairs

and ordered to be printed, with illustrations

WASHINGTON

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CONTENTS.

Paragraphs.

San Carlos Board, order constituting..

1

Act authorizing present San Carlos project investigation.

2

Sessions of board..

4-9

Acknowledgments.

10-13

San Carlos project, general description.

14-22

Prior investigations...,

23-57

Origin of question of water storage on Gila..

23

Lippincott's report..

27

Schuyler's review thereof..

28

Investigation of 1903..

29

Board of reclamation engineers.

31

Reservoir sites above San Carlos..

32-33

Decision of Secretary of Interior on application to use dam and reservoir

sites.....

34-35

Leighton's report.

37

Hermann's report.

38

Quinton's reports..

39-43

Schuyler and Hawgood's report.

44

Schuyler's report..

45

Rosecrans's reports..

46-53

Schuyler's report on project of Pinal Mutual Irrigation ('o..

54-57

Investigation by present board, outline of..

58-63

Diamond drilling done.

64

Upper and lower sites, faults, depth to bedrock, etc.

65-67, 70, 72-75

Type and height of dam..

67-68, 71

Spillway..

69

Cost of dam.

67-79

Reservoir site, properties of.

80

Evaporation from reservoir.

81

Seepage from reservoir....

82

Run-off of Gila River at San Carlos.

83-86

Silt, methods of measuring..

87-88

Silt measurements at San Carlos.

89

Silt carried by Gila River..

90-92

Silt rolled along the bottom..

90

Silt that would accumulate in San Carlos Reservoir.

93

Most suitable height of dam...

115

Safe yearly water supply from San Carlos Reservoir.

105-106

Reservoir capacity required for water storage.

105

Reservoir capacity required for silt storage.

107-115

Raising dam to postpone desilting...

113

Life of reservoir without desilting.

108, 111, 115

Behavior of reservoir formed by dam 180 feet high.

116-118

This reservoir compared with #ngle (Elephant Butte) Reservoir.

119

Flowage damage to San Carlos Indian Reservation.

120-122

Flowage damage to Arizona Eastern Railroad...

123-125

Desilting, necessity of.......

126

Desilting-

By sluicing....

127

By lateral canal..

By conduit on bed of reservoir.

129

Quinton's method....

130

By dredge..

131-132

Power for, and for other purposes, from San Carlos Dam.

133

Gila River between impounding and diversion dams as an irrigation conduit..

134

San Pedro River.....

Paragraphs.

Diversion dam...

136-138

Duty of water..

139-142

Area of Indian, public, and private lands to be taken into project_Canal

system....

143-166

Public lands.

143

Indian lands.

144-147, 153

Private lands.

148-153

Distribution of cost between Indian and private lands.

153

Locality to which San Carlos water should be confined.

155

Quality of lands and waters...

156

Tenders of private lands...

157

Well water, use of.....

158-159

Canals, main, and Pima and Picacho branches.

160-166

Canals, lining....

163-165

Estimate of cost of project..

167-181

For Indian lands.

170-175

For private lands.

176-181

Rights and claims to Gila River waters..

182-188
Bearing of prior rights on advisability of project.

184-185
Conditions to be met by entrymen under project...

187-188

Alternative projects...,

189-201

Storage project for Indians alone prohibitively expensive.

189

Flood-water and pumping project for Indians more expensive than San
Carlos storage project....

190-191

Flood-water project, without pumping or storage, for Indians alone. 198-200

Effect of such project on irrigation near Florence.

200

Possible rights below Pima Reservation...

201

Practicability of project...

202

Uncertainties as to water supply legally available.

205-206

Advisability, factors in...

207

Advisability of project,

For private lands..

207-211

For Indian lands.

212-216

Recommendations..

217

APPENDIXES.

A. Reports, etc., consulted.

B. Box Canyon and dam sites.

C. Log of drilling at San Carlos dam site, 1913.

D. Type and design of dam, etc.

E. Evaporation from reservoir.

F. Run-off of Gila River at San Carlos, Ariz.

G. Silt that would be deposited in San Carlos Reservoir.

H. Flowage damage to San Carlos Agency,

I. Silt disposal.

J. Gila River between impounding dam and diversion dam as an irrigation conduit.

K. Letter of Prof. Forbes on quality of land and waters in Florence-Casa Grande

district.

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