338 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1907. 
The bottom of the sink in November, 1904, just after the cut was 
made, stood 273.5 feet below mean sea level. The rise during Novem- 
ber and December of that year was 0.8 feet. During 1905 it was 21.9 
feet. In 1906 the water continued to rise and increased in depth by 
49.8 feet; but in 1907 the closing of the break in February was fol- 
lowed by a decline, beginning in March, the net fall being, however, 
only 0.18 feet. The level on January 1, 1908, was 201.18 feet below 
mean tide. 
The following table gives the amount of rise and fall by months, 
together with the altitude of the water surface at the end of each 
year, the principal data being obtained from the report of W. B. 
Clapp, printed on page 33 of Water Supply and Irrigation Paper 
No. 2138 of the U. S. Geological Survey: 
Rise and fall of the Salton Sea, in feet. 
Month. 1904. 1905. 1906. 1907. 1908. 
le 
TAMUATY eee eee ee ee ER Oe ee eee Sse weleee 1.4 ites 2.85 —0.02 
MeDIUATY see cote PS et. ts Oe 1.6 1.8 0.7 —0.10 
IM yr 2 a ee a ee are ee ee ee ee 0.8 Sth —0.10 —0,22 
PENG OS eh ap eee ee ed Seer ee 1.2 5.6 —0.30 —0.38 
IM ya RE a a eee ee eee 1.0 8.6 —0.55 —0.55 
UD Gs bce ae oe St a ee ee 2.2 15.4 0:40) |po. 2 eae 
101) ae eee ae eee 4.4 8.6 — (Oy) Seana 
CAUTIOUS Ge see ee ee ee eee Ree eens 2.2 259 =(0330) |2a2s=-- = 
Septempberse 22 a ee nee ee eee Sasa 1.2 0.9 (570 }iece t= 2S 
October se a eee eee 1.4 1. =(e40 ibe - 22 ee 
NioVembers22--s-242-25~ 04225 ho ese ea aes 0.6 1.6 —0:2 == () ps || eee ae ea 
GCE DOD ae = ee oe ee ee See ees 0.2 2.9 122 — (Fs 2O et eee 
Nie tmisessaseass === Ee eset Ce Se ee 0.8 21.9 49.8 =OMIStl ies seeeee 
AltitudetatendiOt years == ssn ee | —272.70 | —250.80 | —201.00 | —201.18 Fe eee 
The area of the Salton Sea at various elevations is shown in the 
following table prepared by W. B. Clapp, of the U. S. Geological 
Survey: 
Area of the Salton Sea. 
Distance . . Distance * 
below sea] “ouare | inequare|| PelOw sea | “Scuare | in square 
feet miles. miles. trent miles. miles. 
270 246 26 170 587 45 
260 272 27 160 632 48 
250 299 29 150 680 50 
240 328 30 140 730 52 
230 358 33 130 782 54 
220 391 37 120 836 56 
210 428 38 110 892 60 
200 466 39 100 300 
190 505 40 50 1,252 536 
180 545 42, 0 1788) ||Sczenneee es 
