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<br />RIO GRANDE COMPACT COMMISSION REPORT
<br />
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<br />
<br />Rio Grande near Lobatos, Colo.
<br />
<br />Location.--Water-stage recorder, lat 37004'42", long 105045'22", in sec. 22, T. 33 N., R. 11 E., on
<br />right bank just downstream from highway bridge, 6 miles north of Colorado-New Mexico State line,
<br />10 miles east of L~batos, and 14 miles east of Antonito. Datum of gage is 7,427.63 ft above mean
<br />sea level, datum 1929.
<br />
<br />Drainaqe area.--7,700 sq mi, approximately (includes 2,940 sq mi in closed basin in San Luis Valley).
<br />Averaqe discharqe.--31 years (1900-30), 846 ft3/s (598,400 acre-ft per year); 50 years (1931-80)
<br />415 ft~/s (300,700 acre-ft per year).
<br />Extremes.--1899-1980: Maximum discharge observed, 13,200 ft3/s June 8, 1905, (gage height, 9.1 ft),
<br />from rating curve extended above 8,000 ft3/s; no flow at times in 1950-51, 1956.
<br />
<br />Remarks.--Records good except those for winter months, which are fair. Natural flow of stream
<br />affected by transmountain diversions, storage reservoirs, ground-water withdrawals and diversions
<br />for irrigation, and return flow from irrigated areas.
<br />
<br /> Monthly and yearly discharge, in cubic feet per second
<br /> Mon th Second- Maximum Minimum Mean Runoff in
<br /> foot-days daily daily acre-feet
<br />January 8,570 330 200 276 17,000
<br />February 9,815 425 230 338 19,470
<br />March 11,690 410 345 377 23,190
<br />April 21,280 1,570 360 709 42,210
<br />May 67,890 3,060 1,440 2,190 134,700
<br />June 68,810 3,140 1,350 2,294 136,500
<br />July 19,748 1,320 238 637 39,170
<br />August 5,376 340 43 173 10',660
<br />September 1,057 154 17 35.2 2,100
<br />October 875 41 21 28.2 1, 740
<br />November 3,704 275 40 123 7,350
<br />December 8,896 350 160 287 17,650
<br />Calendar year 1980 227,711 3,140 17 622 451,700
<br />
<br />willow Creek above Heron Reservoir, near Los Qjos, N. Mex.
<br />
<br />Location.--Water-stage recorder, lat 36044'33",
<br />bank 200 ft downstream from bridge, 0.2 mile
<br />Los Ojos, and at mile 9.7. Datum of gage is
<br />1971, at site 900 ft downstream.
<br />
<br />Grant, on right
<br />3.3 miles west of
<br />Prior to Apr. 1,
<br />
<br />long 106037' 34", in Tierra Amaril1a
<br />downstream from Iron Spring Creek,
<br />7,196.29 ft above mean sea level.
<br />
<br />Drainaqe area.--112 sq mi.
<br />Averaqe discharqe.--7 years (1963-69) 11.5 ft3/s (8,330 acre-ft per year) prior to completion of
<br />Azotea tunnel; 11 years (1970-80) 134 ft3/s (97,080 acre-ft per year) subsequent to completion of
<br />Azotea tunnel.
<br />
<br />Extremes.--1962-80: Maximum discharge, 1,600 ft3/s Aug. 11, 1967 (gage height, 3.88 ft); no flow
<br />at times prior to 1971.
<br />
<br />Remarks.--Records good except those for winter months, which are fair. subsequent to Nov. 16, 1970,
<br />flow affected by transmountain diversions through Azotea tunnel. Flow in Rutheron Drain included
<br />prior to Apr. 1, 1971.
<br />
<br /> Monthly and yearly discharge, in cubic feet per second
<br /> Month Second- Max imum Minimum Mean Runoff in
<br /> foot-days daily daily acre-feet
<br />January 7.21 0.30 0.18 0.23 14
<br />February 54.42 8.5 .24 1.88 108
<br />March 672.1 64 6.8 21. 7 1,330
<br />April 16,156 1,220 23 539 32,050
<br />May 23,620 1,100 420 762 46,850
<br />June 29,904 1,080 863 997 59,310
<br />July 8,908 842 33 287 17,670
<br />August 1,361. 8 201 1.0 43.9 2,700
<br />september 904.8 302 .29 30.2 1,790
<br />October 30.26 12 .07 .98 60
<br />November 5.52 .26 .13 .18 11
<br />December 5.74 .34 .12 .19 11
<br />Calendar year 1980 81,629.85 1,220 0.07 223 161,900
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