PLATE I. Map of the drainage basin of Salinas River III. A, Salinas River above gaging station at Monterey road bridge, near Salinas, showing quicksand in bed of stream; B, Salinas 22 48 IV. 1, Salinas River at Bradley, showing a broad stream terrace, on which the town is built, and the flat-topped hills of the mesa 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. A, 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.. VIII. A, North abutment at Foster dam site; B, South abutment at IX. A, Currier dam site on Arroyo Seco, looking upstream from below the dam; B, South abutment at Currier dam site.. X. A, North abutment at Currier dam site; 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.......... 5. Cross section of canyon of San Antonio Creek at Pinkerton dam site. 6. Discharge of Arroyo Seco at Pettitt ranch from September 1, 1901, 7. Reconnaissance map of The Pools reservoir site 8. Cross section of canyon of Arroyo Seco at The Pools dam site. Page. FIG. 9. Reconnaissance map of Pettitt reservoir site 56 10. Cross section of Los Vaqueros Creek at Pettitt dam site 11. Reconnaissance map of Leigh reservoir site. 57 58 12. Cross section of Los Vaqueros Creek at Leigh dam site 13. Foster reservoir site on Arroyo Seco 58 60 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 76 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, Hon. CHARLES D. WALCOTT, Director United States Geological Survey. F. II. NEWELL, Chief Engineer 7 |