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<br />36
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<br />RIO GRANDE COMPACT COMMISSION REPORT
<br />
<br />Rio Grande near Lobatos, Colo.
<br />
<br />Location.--Water-stage recorder, 1at 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 Lobatos, and 14 miles east of Antonito. Datum of gage is 7,427.63 ft above mean
<br />sea level, datum 1929.
<br />
<br />Draina~e area.--7,700 sq mi, approximately (includes 2,940 sq mi in closed basin in San Luis Valley).
<br />
<br />AveraRe discharRe.--31 years (1900-30), 846 cfs (598,400 acre-ft per year); 46 years (1931-76) 412 cfs
<br />(298,500 acre-ft per year).
<br />
<br />Extremes.--1899-1975: Maximum discharge observed, 13,200 cfs June 8, 1905, (gage height, 9.1 ft),
<br />from 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
<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 />
<br /> Honth Second- Maximum Minimum Mean Runoff in
<br /> foot-days daily daily acre-feet
<br />January 6,980 245 200 225 13 ,840
<br />February 10,275 500 225 354 20,380
<br />March 16,392 699 450 S29 32,510
<br />April 15,636 864 238 521 31,010
<br />May 23,736 1,340 466 766 47,080
<br />June 26,215 1,270 550 874 52,000
<br />July 9.120 574 154 294 18,090
<br />August 4,778 238 73 154 9.480
<br />September 1,392 118 31 46.4 2,760
<br />October 2,993 174 55 96.5 5,940
<br />November 3,993 178 70 133 7,920
<br />December 4,025 160 105 130 7,980
<br />Calendar year 1976 125,535 1,340 31 343 249.000
<br />
<br />Willow Creek above Heron Reservoir, near Park View, N. Mex.
<br />
<br />Location.--Water-stage recorder, 1at 3604413311, long 106037'34", in Tierra Amari11a Grant, on right
<br />bank 200 ft downstream from bridge, 0.2 mile downstream from Iron Spring Creek. 3.3 miles west of
<br />Park View, and at mile 9.7. Datum of gage is 7,196.29 ft above mean sea level. Prior to Apr. 1,
<br />1971 at site 900 ft downstream.
<br />
<br />Draina~e area.--112 sq mi.
<br />
<br />AveraKe dischar~e.--7 years (1963-69) 11.5 cfs (8,330 acre-ft per year) prior to completion of Azotea
<br />tunnel; 7 years (1970-76) 119 cfs (86,220 acre-ft per year) subsequent to completion of Azotea tunnel.
<br />
<br />Extremes.--1962-76: Maximum discharge, 1,600 cfs Aug. 11, 1967 (gage height, 3.88 ft); no flow at times
<br />prior to 1971.
<br />
<br />Remarks.--Records good except those for winter months, which are fair.
<br />affected by transmountain diversions through Azotea tunnel. Flow in
<br />Apr. I, 1971.
<br />
<br />Subsequent to Nov. 16, 1970, flow
<br />Rutheron Drain included prior to
<br />
<br />Monthly and yearly discharge, in cubic feet per second
<br />
<br />!
<br />
<br />'1
<br />
<br />Honth Second- Maximum Minimum Mean Runoff in
<br /> foot-days daily daily acre-feet
<br />January 17 .32 34 0.76 0.56 34
<br />February 91. 79 14 .67 3.17 182
<br />March 886.2 67 7.6 28.6 1.760
<br />April 7,632 484 99 254 15,140
<br />May 17,245 861 275 556 34,200
<br />June 14,312 850 173 477 28,390
<br />July 2,152 170 12 69.4 4,270
<br />August 607.2 98 2.4 19.6 1,200
<br />September 727.14 159 .76 24.2 1,440
<br />October 485.36 62 .52 15.7 960
<br />November 13.63 .88 .23 .45 27
<br />December 8.96 .59 .12 .29 18
<br />Calendar year 1976 44,178.60 861 .12 121 87,630
<br />
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