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<br />;:",,_ d_~~ - ,'. .-_ ii <br /> <br />--j,':~;-'-' ~,,,>,..ii~ <br /> <br />,~ .' ''''-.J.-; '...'.-', <br /> <br />-,"~C' <br /> <br />1:'- <br /> <br />36 <br /> <br />RIO GRANDE COMPACT COMMISSION REPORT <br /> <br />CD <br />C"? <br />:.~ ) <br /> <br />Rio Grande near Lobatos, Colo. <br /> <br />Location. -.Water.stage recorder, lat 37005', long 105~51, in sec. 22, T. 33 N., R. 11 E., on right bank just <br />downstream from highway bridge, 6 miles north of Colorado-New Mexico State line, 10 miles east of Lohatos, <br />and 14 miles east of Antonito. Datum of gage is 71426. 79 it above mean sea level, datum of 1929. <br /> <br />.....'-. <br />.....-0' <br /> <br />Drainage area. --7,700 sq mi, approximately (includes .2,940 sq mi in closed basill' in San Luis Valley). <br /> <br />AveraKe discharge. .-71 years (1900-70), 603 cfs (436,900 acre-ft per year). <br /> <br />Extremes. u 1899-1970: Maximum discharge observed, 13,200 cis June 8, 1905, (gage height, 9.1 it), from <br />rating curve extended above 8,000 cfs; no flow at times in 1950-51, 1956. <br /> <br />Remarks. --Records good except those for winter months, which are fair. Natural flow of streams affected by <br />transmountain diversions, storage reservoirs, ground-water withdrawals and diversions for irrigation, and <br />return flow from irrigated areas. <br /> <br /> Monthlv and vearlv dischare:e in cubic feet ner second <br /> Month SecoAd- Maximum Minimum Mean Runoff in <br /> foot days daily dal1y Acre-feet <br />January 10, 380 420 265 335 20,590 <br />February 12,068 490 340 431 23,940 <br />March 14,794 514 460 477 29,340 <br />April 13,145 562 290 438 26,070 <br />May 26, 680 1,350 370 861 52,920 <br />June 13,816 713 242 461 27,400 <br />July 5,584 445 67 180 11,080 <br />August 2,455 167 46 79.2 4,870 <br />Septemb~r 17,992 1,920 44 600 35,690 <br />October 13,306 594 216 429 26, 390 <br />November 20,377 952 526 679 40,420 <br />December 12,516 556 270 404 24,830 <br />Calendar year 1970 163, 113 1,920 44 447 323,500 <br /> <br />Rio Chama below EI Vado Dam, N. Mex. <br /> <br />Location. -.Water-stage recorder, lat 36"34'50", long 106"43'30", in Tierra Amarilla Grant, 1. 5 miles downstream <br />from EI Vade Dam, 2.7 miles upstream from Rio Nutrias, and 13 miles southwest of Tierra Amarilla, Rio Arriba <br />County. Datum of gage is 6, 696. 12 ft above mean sea level, datum of 1929. Prior to October 1935, at site 1. 5 miles <br />upstream and October 1935 to September 1938, at site 1. 1 miles upstream at different datum. <br /> <br />Drainage area. .-877 sq m!. <br /> <br />Average diSChar~e. ~-4 years (1914, 1921-23), 444 cfs prior to completion of dam; 35 years (1936-70), 372 cfs <br />{269, 500 acre- eet per year) subsequent. to completion of EI Vade Dam. <br /> <br />Extremes. --1914-16, 1920-24, 1938.70: Maximum discharge observed, 9, 000 cfs May 22, 1920 (gage height, <br />12 ft); no flow Mar. 25, 26, 31, 1955. <br /> <br />Remarks. --Records good except those for some winter months, which are poor. Diversions above station for <br />irrigation of about 8,000 acres. Since 1935 flow regulated by El Vado Reservoir. <br /> <br />d <br /> <br /> Monthly and yearly discharl'te in cubic feet per secon <br /> Month Second- Maximum Minimum Mean Runoff in <br /> foot-days daily dally Acre-feet <br />January 2,190 95 55 70.6 4,340 <br />February 2,273 108 60 81. 2 4,510 <br />March 2,630 103 74 84.8 5,220 <br />April 2,910 161 83 96.7 5,750 <br />May 47,287 3,620 93 1,525 93, 790 <br />June 10,518 645 145 351 20,860 <br />July 3,098 233 53 99.9 6, 140 <br />August 3,095 300 44 99.8 6, 140 <br />September 6,970 896 42 232 13,820 <br />October 3,033 154 63 97.8 6,020 <br />November 13,342 730 49 445 26,460 <br />December 1,959 85 47 63.2 3,890 <br />Calendar year 1970 99,305 3,620 42 272 197,000 <br /> <br />~:~t~~~~~~~'t <br />"''''il!~'' <br /> <br />,",c <br /> <br />."'" <br /> <br /> <br />~~~:-~~.., <br /> <br /> <br />i~~ <br /> <br />'~'" <br />~:i~~~il <br /> <br />"'.". <br />