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PLATE I. Map of the drainage basin of Salinas River

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II. Map of the Salinas Valley, showing irrigated lands, canals, pro-

posed reservoirs, and location of wells

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III. A, Salinas River abore gaging station at Monterey road bridge,

near Salinas, showing quicksand in bed of stream; B. Salinas

River near Kings City, showing drifted sand blown upstream

by the prevailing northwest wind

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IV. A, Salinas River at Bradley, showing a broad stream terrace, on

which the town is built, and the flat-topped hills of the mesa

beyond; B. Nacimiento River at gaging station near Bryson

post-office

V. A, Oak groves in San Antonio River Valley north of Jolon; B, San

Antonio River Valley southeast of Jolon

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VI. A, Canyon of Arroyo Seco at Foster dam site, showing stream

terrace; B, Canyon of Arroyo Seco, 16 miles southwest of Sole-

dad, showing stream terraces, also Santa Lucia Mountains...

VII, d, Channel of Arroyo Seco at Abbott's ranch, 16 miles southwest

of Soledad, showing granitic detritus in bed of stream; B, Leigh

dam site on Los Vaqueros Creek, looking downstream.

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VIII. 4, North abutment at Foster dam site; B, South abutment at

Foster dam site....

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IX. A, Currier dam site on Arroyo Seco, looking upstream from below

the dam; B, South abutment at Currier dam site

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X. A, North abutment at Currier dam site; B. Summit region of

Mount Diablo Range at head of Gaviota Creek, showing scat-

tering growth of timber and brush

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XI. A, Mathews dam site, looking downstream, showing granite bed

rock below soft shales of mesa region; B, Spreckels Sugar Com-

pany's pumping plant on Soledad rancho at ranch No. 2... 70

XII. Spreckels Sugar Company's pumping plant near Kings (ity, at

ranch No. 3....

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Fig. 1. Diagram showing unequal distribution of rainfall, the result of

topography, in California and Nevada.

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2. Diagram showing unequal distribution of rainfall, the result of

topography, in the Coast Range of California

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3. Diagram showing monthly distribution of rainfall in the Salinas

Valley -

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4. Reconnaissance map of Pinkerton reservoir site

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5. Cross section of canyon of San Antonio Creek at Pinkerton dain site. 52

6. Discharge of Arroyo Seco at Pettitt ranch from September 1, 1901,

to August 30, 1902...

7. Reconnaissance map of The Pools reservoir site

8. Cross section of canyon of Arroyo Seco at The Pools dam site.

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Fig. 9. Reconnaissance map of Pettitt reservoir site

10. Cross section of Los Vaqueros Creek at Pettitt dam site
11. Reconnaissance map of Leigh reservoir site
12. Cross section of Los Vaqueros Creek at Leigh dam site
13. Foster reservoir site on Arroyo Seco
14. Capacity curve of Foster reservoir, showing capacity, in thousands

of acre-feet, with the water surface at various levels.
15. Foster dam site and spillway on Arroyo Seco..
16. Maximum cross section of proposed Foster dam
17. Profile of outlet tower and tunnel of proposed Foster reservoir
18. Currier reservoir site on Arroyo Seco
19. Capacity curve of proposed Currier reservoir, showing capacity, in

thousands of acre-feet, with the water surface at various levels.. 20. Currier dam site and spillway on Arroyo Seco 21. Maximum cross section of Currier dam 22. Profile of outlet tower and tunnel of Currier reservoir 23. Discharge of San Lorenzo Creek at Mathews ranch from September

1, 1901, to August 30, 1902. 24. Mathews reservoir site on San Lorenzo Creek. 25. Capacity curve of proposed Mathews reservoir, showing capacity, in

thousands of acre-feet, with the water surface at various levels.. 26. Mathews dam site and spillway on San Lorenzo Creek.---27. Maximum cross section of Mathews dam.. 28. Profile of outlet tunnel and shaft of Mathews reservoir. 29. Plan of outlet gates of Mathews reservoir...30. Vertical section on line A-B through outlet gates of proposed

Mathews reservoir

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LETTER OF TRANSMITTAL.

DEPARTMENT OF THE INTERIOR,
UNITED STATES GEOLOGICAL SURVEY,

HYDROGRAPHIC BRANCH,

Washington, D. C., July 22, 1903. SIR: I have the honor to transmit herewith, for publication in the Water-Supply and Irrigation series, a report on the water resources of the Salinas Valley, California, by Mr. Homer Hamlin.

The report relates particularly to that portion of the Salinas Valley which lies within the boundaries of Monterey County. It describes the topography, hydrography, and economic geology of a portion of the region and discusses the methods of irrigation and the irrigation systems, the extent of underground waters, and the possibility of extending irrigation by the utilization of surface streams and the impounding of flood waters. Very respectfully,

F. H. NEWELL,

Chief Engineer Hon. CHARLES D. WALCOTT,

Director United States Geological Survey.

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