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<br />RIO GRANDE COMPACT COMMISSION REPORT
<br />
<br />Rio Grande near Lobalos, Colo.
<br />
<br />Location.-Water-stage recorder, lat37"04'42", long 105045'22", in sec. 22, T. 33 N., R II E., on right bank at highway bridge, 6 mlles
<br />north of Colorado-New Mexico State line, 10 miles east of labatos, and 14 miles east of Antonito. Datum of gage is 7,427.63 ft above
<br />mean sea level, datum of 1929.
<br />Drainaee area.-7,700 sq mi, approximately (includes 2,940 sq mi in closed basir\ in San Luis VaUey).
<br />Average discharge.-31 years (1900-30), 846 W Is (612,900 acre-It per year); 61 years (1931-91) 448 It' Is (324,600 acre-It per year).
<br />Extremes.-1899-1991: Maximum discharge observed, 13,200 It'/s June 8, 1905 (gage height, 9.1 ft), from rating curve extended above
<br />8,000 It'/s; no flow at times in 195<1-51, 1956.
<br />Remarks.-Records good except those for winter months, which are fair. Natural flow of stream affected by transmountain diversions,
<br />storage reservoirs, ground-water withdrawals and diversions for ilTigation. and return flow from irrigated areas.
<br />
<br /> Monthly and yearly discharge, in cubic feet per second
<br /> Second- Maximum Minimum Runoff In
<br />Month foot-days daily dally Mean acre-feet
<br />January 8,900 310 250 287 17,650
<br />February 8,985 400 270 321 17,820
<br />March 14,216 537 390 459 28,200
<br />April 27,989 1,660 463 933 55,520
<br />May 31,986 2,010 427 1,032 63,440
<br />June 22,519 1,330 345 751 44,670
<br />July 10,114 649 162 326 20,060
<br />August 7,139 541 94 230 14,160
<br />September 6,236 519 53 208 12,370
<br />October 2,336 114 55 75.4 4,630
<br />November 8,315 371 92 277 16,490
<br />December 8,505 310 210 274 16,870
<br />Calendar year 1991 157,240 2,010 53 <l31 311,900
<br />
<br />Willow Creek above Heron Reservoir, near Los Ojos, N. Mex.
<br />
<br />location.-Water-stage recorder, lat 36044'33", long 106037'34-, in Tierra Amarilla Grant, on right bank 200 ftdownstream from bridge,
<br />0.2 mile downstream from Iron Spring Creek. 3.3 mUes west of Los 0}05. and at mile 9.7. Datum of gage is 7,196.29 ft above mean
<br />sea level. Prior to Apr. I, 1971, at site 900 ftdownstream.
<br />Draina2:e area.-ll2 sq ml.
<br />A vera"" discharge.-7years (1963-69), 1I.5 W Is (8,330 acre-It per year) prior to completion of Awtea tunnel; 22 years (197<1-91), 137 W Is
<br />(99,260 acre-ft per year) subsequent to completion of Awtea tunnel.
<br />Extremes.-1962-91: Maximum discharge, 1,610 W Is Mar. \2,1985 (gage height, 6.65 ft); no flow at times prior to 1971.
<br />Remarks.-Records good except those for winter months, which are fair. 5ubsequentto Nov. 16, 1970, flow affected by lransmountain
<br />diversions through Azotea tunnel. Flow in Rutheron Drain included prior to Apr. 1, 1971.
<br />
<br /> Monthly and yearly discharge, in cubic feet per second
<br /> Second- Maximum Minimum Runoff in
<br /> Month foot-days daily daily Mean acre-feet
<br /> January 18.0 1.0 .50 .58 36
<br /> February 96.1 8.1 1.0 3.<l3 191
<br /> March 2,190.9 144 7.6 70.7 4,350
<br /> April 16,000 926 150 533 31,740
<br /> May 21,111 931 199 681 41,870
<br /> June 17,822 992 326 594 35,350
<br /> July 3,202 263 17 103 6,350
<br /> August 657.0 83 2.0 21.2 1,300
<br /> September 836.20 324 .00 27.9 1,660
<br />~ October 36.00 5.0 .50 1.16 71
<br />~ November 40.00 2.0 .50 1.33 79
<br />December 16.50 1.0 .00 .53 33
<br />1 Calendar year 1990 62,025.70 992 .00 170 123,000
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