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<br />RIO GRANDE AT O'rOWI BRIDGE NEAR SAN ILDEFONSO, N. l\iEX.
<br />
<br />LOCATION _ Water-stage recorder. iat. 35 degrees 52 min.. long. 106 degrees 9 mln,. in
<br />San Ildefonso Pueblo Grant. at Denver and Rio Grande Western Railroad bridge 2
<br />miles southwest of San Ildefonso and 3 miles downstream from Rio Pojoaque.
<br />Datum of gage is 5.488.48 feet above mean sea level (datum of 1929).
<br />
<br />URAINAGE AREA - 14.300 square miles (includes 2.940 square miles in closed basin in
<br />northern part of San Luis Valley. Colorado).
<br />
<br />RECORDS AVAILABLE - FebI'Uary 1895 to December 1905. June 1909 to December 1914.
<br />October 1930 to December 1941 iIi reports of Geological Survey. February 1895 to
<br />December 1905. June 1909 to December 1931 in reports of State Engineer, January
<br />1941 to December 1941 in report of Rio Grande Compact Commission.
<br />AVERAGE DISCHARGE - 14 years (1927-41). 1.[;48 second-feet.
<br />EXTREMES - Maximum discharge during year. 22.500 second-feet May 16; maximum
<br />gage height. 13.70 feet May 14.; minimum daily discharge. 341 second-feet Nov. 14.
<br />1930-41: Maximum discharge. that of May 16. 1941; maximum gage height. that of
<br />May 14. 1941; minimum daily discharge. 128 second-feet June 21. 1934.
<br />REMARKS _ Records good. Flow partially reguiatedby operation of El Vado Reser-
<br />voir on upper Rio Chama which stores water for inlgation. Diversions above sta-
<br />tion for irrigation.
<br />
<br />---~-_.._.,- . ----.-..-------------.---. ------- ._----------_... _n ._.__. ____.____.._.
<br /> Dlscbarg'c, in second-feet, calendar year 1941
<br />Day Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec
<br />1 680 530 827 2.200 3.860 13.500 9.030 1.130 1.060 1.230 3,940 1.520
<br />2 644 518 841 2.010 6.020 12.300 8.150 1.210 1.080 1.080 3.850 1,420
<br />3 632 1,460 883 1.950 6.400 11.800 7.090 1.270 1.090 1.280 3.760 1,470
<br />4 530 1.110 869 2,460 7.020 11.800 5.670 1.520 1.0lO 1.tOO 3,680 1.470
<br />5 505 869 922 2.740 7.670 12,000 5.670 1,520 990 1.680 3.680 1,470
<br />6 555 898 1,050 2.400 9.080 12,300 5.670 1.780 990 1.620 3.680 1.380
<br />7 560 962 1.070 1,950 10.700 12.300 5.670 1.900 1.030 1.730 3.190 1.270
<br />8 525 970 1.070 1.950 11.500 12.800 5,670 1.900 742 2.030 2.320 1.320
<br />9 555 922 1.000 2.0lO 13.000 14.000 5.670 1,950 694 2.590 2.190 1.3lO
<br />10 545 978 938 2.200 14.200 13.000 5,100 1.780 694 2.660 2.130 1.380
<br />11 566 986 869 1.950 14.800 12.500 4.550 1.620 694 2.590 2.070 1.470
<br />12 626 1.000 841 1.720 16.500 10.600 4.370 1.570 735 2.520 2.320 1.470
<br />13 626 954 834 2.460 19,400 9.030 3.850 2.010 1.180 3.020 2.380 1.520
<br />14 608 736 898 2.260 21.400 7.930 3.680 1.840 1.320 3.550 2,380 1,420
<br />15 632 722 938 2.010 21,700 7,5lO 3.600 1.780 1.380 2.800 2,320 1.330
<br />16 614 799 962 2,070 22.000 7,090 3,510 1.840 1.330 2.960 2.260 1.330
<br />17 578 1,080 1,210 2.330' 21,700 7.090 3.350 1,780 1.230 3.350 2.190 1.290
<br />18 566 862 1,280 2,330 20.600 6,670 3.030 1,780 1.3lO 3.430 2,380 1.2'00
<br />19 584 938 1.410 2.010 19.300 6.670 2.961 1.680 1,330 3.550 2.260 1.270
<br />20 620 978 1.510 1,660 18.000 7.090 2.880 1.920 2.020 3,270 2,070 1.200
<br />21 644 978 1.610 1.610 17.200 7.930 2,800 2.000 1.460 3.190 2.010 1.200
<br />22 614 1.030 1.830 1,460 15,500 8,8lO 2.660 1,570 1.180 3.190 2.070 1.200
<br />23 608 1.050 1,660 1.610 14.200 9.470 2,380 1.020 2.410 3.320 1,900 1,160
<br />24 620 1.000 1,950 1.890 13,700 lO.400 2.320 950 1,190 2.590 1,840 1,130
<br />25 644 1.030 2,200 1.780 14.000 11.100 2.320 868 926 2.800 1,780 974
<br />26 650 994 2.140 2.010 14.000 10.600 1.900 798 868 3,030 1,730 840
<br />27 620 922 2.010 2.460 15.000 10.400 1.840 721 382 2.800 1,730 1.090
<br />28 596 834 2.010 2.960 16.000 10,600 1.680 658 974 2.960 1,420 990
<br />29 608 2.140 3.280 16,700 10,400 1.520 634 1.700 3.940 1.520 926
<br />30 602 2.200 3,200 16.000 9.470 1.380 676 1.780 3.110 1.570 1.080
<br />31 590 2,010 15.000 1.220 1.050 3.680 1.080
<br />._..........___.mn.___....._____.__.__.__ .. ".------.. --------
<br /> Second- Run-off in
<br /> Month foot-days Maximum Minimum Mean acre-feet
<br />January _~..______.............,..._,___"____~...._........_......_ 18.547 680 505 598 36.790
<br />February ___._____................._..__,........______........___. 26.110 1.460 518 932 51,790
<br />March ...__..___........._..___..u____....,...._.._____...._____~.... 41.982 2.200 827 1.354 83,270
<br />April .....___..__.... _........... ___ __...............,__ ____....... ...___ 64.930 3.280 1.460 2.164 128.800
<br />May .___.. ~ __..___..............______ __........ _ ___....___ ........u.., 452.150 22.000 3.860 14.590 896.800
<br />June _ _..~..,___........ ~..___..__....... ..,...._.._ ____.......,....... ..307 .160 14.000 6.670 10.240 609.200
<br />July ..__."_"_ _ _............._..___.._..__.." ,....___,__ ..__..___..,....121.190 9.030 1.220 3.909 240.400
<br />August ..__........' _ _ .......,.....___ ..____..__........__" __.._____ 44.725 2.010 634 1,443 88.710
<br />September ........_______....__,_~....,__....___......._......... 35,279 2.4lO 694 1;176 69.910
<br />October ~...___........... _..__ _.." ~ ...._ ,... _ ..__,....__........_.. _ 83.250 3.940 1.080 2.685 165.100
<br />November ___..._____......__............________.._____.....___'_~. 72.620 3.940 1.420 2.421 144,000
<br />December ,.........._____....._________'______..'..__._____...,. 39.260 1.520 840 1.266 77,870
<br />Year ..____._......______,___........_.. ____..............1 ,307 ,203 22,000 505 3,581 2.593,000
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