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<br />RlO GRANDE COMPACT COMMlSSION REPORT
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<br />Rio Grande near Lobat05, Colo.
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<br />~.-Water.stage recorder, !at 37'04'42", long 105045'22", in see. 22, T. 33 N., R. 11 E., on right bank at highway bridge, 6 miles
<br />north of Colorado-New Mexico State line, 10 miles east of Lobatos, and 14 miles east of Antonito. Datum of gage is 7,427.63 ft above
<br />mean sea level, datum of 1929.
<br />Drainalle area.-7,700 sq mi, approximately (includes 2,940 sq mi in closed basin in San Luis Valley). .
<br />Avora.o dischar~,-31 years 0900-30), 846 It' /s (612,900 acre-ft per year); 67 years 0931-97) 453 It' /s (326,200 acr~lt per year),
<br />Extremes.-1899-1997: Maximum discharge observed, 13,200 f~ /s June 8, 1905 (gage height, 9J fi), from rating curve extended above
<br />8,000 It' /5; no flow at limes in 1950-51, 1956,
<br />Remarks.-Records good except those for winter months, which are fair. Nahlral flow of stream affected by transmountain diversions,
<br />storage reservoirs, ground.water withdrawals and diversions for irrigation, and return flow from irrigated areas.
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<br /> Monthly and yearly discharge, in cubic feet per second
<br /> Second- Maximum Minimum Runoff in
<br />Month foot-<lays daily daily Mean acre-feet
<br />January 10,005 380 250 323 19,B40
<br />February 10,()l1 390 325 359 19,920
<br />March 19,536 1,010 355 630 38,7S0
<br />April 12,584 803 218 419 24,960
<br />May 39,479 2,450 351 1,274 78,310
<br />June 59,475 3,470 975 1,983 118,000
<br />July 16,282 1,170 299 525 32,300
<br />August 16,816 671 302 542 33,3S0
<br />September 22,224 2,120 334 741 44,080
<br />Octob.. 37,299 2,070 729 1,203 73,980
<br />November 23,726 1,100 599 791 47,060
<br />December 13,336 700 300 430 26,450
<br />Calendar year 1997 280,803 3,470 218 769 557,000
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<br />Willow Creek above Heron Reservoir, near Los Ojos, N. Mex.
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<br />Location.-Water.stage recorder,lat 36044'33", long 1060:37"34", in TIerra Amarilla Grant, on right bank 200 it downstream from bridge,
<br />0.2 mile downstream from Iron Spring Creek, 3.3 miles west of Los Ojos, and at mile 9,7, Datum of gage is 7,196.29 ft above mean
<br />sea level. Prior to Apr. L 1971, at site 900 It downstream,
<br />Drainae area.-ll2 sq mi.
<br />Avera... cllscharee.-7 yoan 0963-69), ll.5 ft'/s (8,330 acre-It per year) prior to completion of Azotea tunnel; 28 yoan 0970-97), 138 ft' /s
<br />(98,530acre-ft per year) subsequent to completion of Azatea tunnel.
<br />Extremes,-1962-97: Maximum discharge, 1.610 ft' /5 Mar. 12, 1965 (gage height, 6.65 ft); no flow at times.
<br />Remarks.-Records good except those for winter months, which are fair. Subsequent to Nov. 16, 1970, now affected by transmountain
<br />diversions through Azatea tuMel. Row in Rutheron Drain included prior to Apr. I, 1971.
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<br /> Monthly and yearly discharge, in cubic feet per second
<br /> Second- Maximum Minimum Runoff in
<br />Month foot-<lays daily daily Mean acre-feet
<br />January 154.60 55 .00 4.99 3m
<br />February 153.30 11 ,00 5.47 304
<br />March 7,611 639 3.0 246 15,100
<br />April 8,090 485 % 270 16,DSO
<br />May 21,222 943 233 685 42,090
<br />June 23,474 958 5()l 7B2 46,560
<br />July 5,634 452 94 182 11,180
<br />August 4,814 466 38 155 9,550
<br />September 1,701 253 10 56,7 3,370
<br />Octob.. 1,070 75 7.0 34.5 2,120
<br />November 0,00 .00 ,00 .000 .00
<br />December 0.00 .00 .00 .000 .00
<br />Calendar year 1997 73,923.90 958 .00 203 146,600
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