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<br /> RIO GRANDt COMPACT COJ.!MI~SION
<br /> RIO GRANDE AT SAN MARCIAL, NEW ME~ICO
<br />Desoription.- Water~stage recorder and cable with sit. down cable QaT and winch located at railroad bridge about one mile
<br /> belOw San MArcial, New Mexico, and 177.1 miles above the American Dam at El Paso, Texas. The reo order is on the upstream
<br /> end of the first bridge pier from the south abutment of the bridge and the tero of its gaga 18 4.~55.38 teet, United
<br /> states Coast and Geodetic Survey sea level datum. The recorder was moved to the downstream end of the south abutment of
<br /> the bridge on May 26. 1942. Zero of this gage is 4.h59.0e feet (SlIJf\8 datUtrl). The recorder was returned to the ori~inal
<br /> location on July I, 1942.
<br />Recorda.. Based upon I;; meter measurements, by wading, and fr~ cable about 1.000 feet above railroad bridge (125 measure-
<br />~e by I. B.C. and 8 by U.B.G.S.). Computations by shifting ohannel methods. 1942 records good. Records available:
<br /> January 1895 to December 1942.
<br />Remarks.- For gage history 1895 to 1938 see Water Bulletins Nos. 4. 7 and B. Since April 1937 the river has been flowin&
<br />~uGh the Val Verde area. but on July 16, 1942 it returned to its ol~ channel ~nd is now passing under the hi~hway
<br /> bridge. See Water Bulletin No.7.
<br /> E1 Vado and smaller reservoirs and many irrigation diversions and drainage returns above this station in Colorado and
<br /> New Me~ico modify the river flow.
<br />Comparative flows from records.- Momentary Peak~ Mu.. Oct. 11. 1904. 50.000 see. ft. with _ter surface level of 4.h59.5
<br /> 1't. on U.S.c. and G.S. datum about .25 mile above the present station gage. This is the greatest flood peak flow in at
<br /> least the past 114 years. or since 182B. Mln.. sometimes dry. See Water Bulletin No.6, page 79, for large peak flows
<br /> slnee 1828 and their average frequency. Daily: Mu., Oot. 11. 1904. ;3,000 seo. ft. average. Min., sometimes dry.
<br /> Monthly: Max.. May 1941. 16,159 sec. ft. average. Min., sometimes dry. Yearly: Nax., 1941, 3.911 sec. ft. average.
<br /> Min., 1902. 277 s"c. ft. average. Two Sueoessiv" Years: ],lax.. 1941 and 1942. ;,~OO sec. ft. average. Nin.. 1899 and 1900.
<br /> 487 sec. ft. average. Three Successive Years I Max.. 1905 to 1907. 2.830 sec. ft. a'Terage. Jl1n.. 1900 to 1902. f:/:Ij sec.
<br /> !'to average. Four Successive Years: Max.. 1905 to 1908, 2.390 sec. ft. average. Min.. 1899 to 1902. 539 sec. ft. a'Ter-
<br /> age. FiTe Successive Years: Max.. 1905 to 1909, 2,260 sec. ft. average. Min.. 1898 to 1902, 697 seo. ft. .verage.
<br /> Ten successive Years: Nax.. 190; to 1912. 1.980 sec. ft. average. Min., 1931 to 1940. 1,140 seo. ft. average. Forty-
<br /> Eight Year average: 1.580 sec. ft.
<br />D.y J~. reb. liar. Apr. ..y J=. July A.ug. Sept. Oct. Nev. Dee.
<br />1 1,360 1.11...0 1.170 1.540 10.500 11.900 1.190 32Q 354 580 l,22 3at,
<br />2 l,~O 1,200 1.100 1.670 9,620 10.700 1.190 366 465 515 376 298
<br />3 1,320 1.190 940 1.820 8.310 1l.700 1.400 1,47 ~57 506 352 455
<br />4 1,2<)0 1,190 645 2,030 9.210 11.300 1.150 921 37 465 411 4."
<br />5 1,250 1.050 945 2.810 9.050 10.800 1,060 710 799 497 543 497
<br />6 1.160 1.180 6jj 3.B90 7,960 10.700 950 t~ 992 377 460 1,47
<br />7 1,160 1.210 930 4,930 7,770 10.~00 634 710 494 412 645
<br />6 1,110 1,160 l,h50 5.650 6,070 9.650 915 650 1.030 616 366 765
<br />9 1,000 1.030 1.680 ~.640 8.710 9.200 li~ 645 593 499 316 B46
<br />10 945 1,210 1.740 4.230 9.570 8.700 553 5jj 464 265 9<>'1
<br />11 1.180 1.450 1.120 l,940 10,800 7.780 42l 653 395 465 30') ,652
<br />12 1,500 1,330 761> ,350 11. 700 7.400 639 971 1,220 606 jjl 649
<br />I) 1.240 l,~O 790 5.130 12.600 7.550 656 726 2.BOO 630 jjl 750
<br />14 1.200 1. 0 1.210 5.810 14.LJoo 7.500 640 560 2.750 625 2J7 707
<br />15 1,120 1.170 1,540 5.790 14.400 8.260 B46 437 1.560 661 226 725
<br />16 1.1l.,) 1.120 1.990 5.230 13.600 7,1M 64B 426 1,100 556 243 626
<br />17 1.200 1.140 2,BOO 6.110 12.000 6.500 66B 519 ~ 624 236 641
<br />lB 1.200 1.050 2.150 7,710 9.350 6.310 536 722 727 231 674
<br />19 1.180 980 1.910 9.510 6.640 ~,630 604 665 B40 621 246 9JJ.
<br />20 1.230 1.010 1.890 11.600 6.540 ,960 596 436 m 796 259 924
<br />21 1.300 1.010 1.600 1l.300 8.300 4.490 475 299 666 614 232 990
<br />22 1.000 900 1.BOO 10.000 8,810 4.660 676 247 706 666 237 1,020
<br />23 1.140 650 1.960 9.050 9,470 4,610 530 221 Tl9 559 251 m
<br />24 1.060 915 1.670 9.080 10.200 3.960 313 279 66B 5'73 2SO 968
<br />25 1.110 1,110 1.;80 12,900 10.400 3.790 316 1,0;0 650 522 319 968
<br />26 1,120 1.1~0 1.850 17,800 10.700 3.490 372 955 532 466 42B 1,020
<br />27 1.100 1.HO 2,200 14.e:;00 1O.~ 2,690 l!t1 ~ ~ 364 402 1,080
<br />26 1.100 1.100 1.960 12.000 10. 0 2.~70 390 ;46 1.110
<br />~ 1.060 1.950 11.600 11.000 2.110 f~ 481 466 466 315 1.150
<br />~.~~ ~.~~ 10.900 ~~. 700 1.840 {P! 734 ~?I 262 1.010
<br /> Mouth Second- Maximum Minimum Itea.n Run-off in
<br /> foot-days acre. feet
<br />Janu.ry..,........ ..... ...... ........................... 36,565 1.580 680 1.180 72,600
<br />rebruary......... ...................... .......... ...... 31,125 1.600 625 1.110 61.700
<br />Karch.... ........ ........ ................... ..... ...... 47,663 4.160 700 1,540 94,600
<br />April.. .......... ..... ........ ......................... 217,720 18.400 1.410 7.260 4;2.000
<br />May........... ............................. ............ 319.180 15.100 7.400 l:>.~OO 633,000
<br />June........ .... ....... .... .......... .... .... ... ....... 200.J.j.l0 12,100 1,560 6.950 413.000
<br />July........ ..... ... ...... ..... ...... ..... ............. 21,261 1.460 2<)0 6B6 42,200
<br />August........... ... ................... ......... ....... 17,237 1,490 177 556 ;4.200
<br />September............................................. . 26.225 4.2;0 31. 674 52.000
<br />October..... ..... ....... .... ... .... .... ... ..... ........ 17.521 672 326 565 34,600
<br />November.............................................. . ~.~~ 572 ~~ 322 ~~.2OO
<br />December......... ........ ....... ... ........ ...... ...... 1 '00 61< 0100
<br /> year..................................... ..... 977 ,874 18.400 177 2.679 1.939,400
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