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<br />RIO GRANDE COMPACT COMMISSION REPORT
<br />
<br />Rio Grande near Lobatos, Colo.
<br />
<br />Location.-~Water-stage recorder, lat 37004'42", long 105045'22", in sec. 22,1. 33 N.,
<br />R, 11 E., on right bank just downstream from highway bridge. 6 miles north of Colorado-
<br />New Mexico State line, 10 miles east of Lobatos, and 14 miles east of Antonito. Datum
<br />of gage is 7,427.63 ft above mean sea level, datum of 1929.
<br />
<br />Drainage area.--7,700 sq mi, approximately (includes 2,940 sq mi in closed basin in San Luis
<br />Valley) ,
<br />
<br />AveraRe discharge.--75 years (1900-74), 589 cfs (426,700 acre-ft per year),
<br />
<br />Extremes.--1899-1974: Maximum discharge observed, 13,200 cfs June 8, 1905, (gage height,
<br />9.1 ft), from rating curve extended above 8,000 cfs; no flow at times in 1950-51, 1956.
<br />
<br />~emarks.--Records good except those for winter months, which are fair. Natural flow of
<br />streams affected by transmountain diversions, storage reservoirs, ground-water withdrawals
<br />and diversions for irrigation, and return flow from irrigated areas.
<br />
<br />Monthly and yearly discharge. in cubic feet per second
<br />
<br /> Second- Maximum Minimum Runoff in
<br />Month foot-days daily daily Mean Acre-feet
<br />January 8,425 300 230 272 16.710
<br />February 7,625 295 250 272 15.120
<br />March 17,398 736 300 561 34.510
<br />April 8,377 760 128 279 16,620
<br />May 5.414 350 55 175 10,740
<br />June 2,511 170 25 83.7 4,980
<br />July 676 31 15 21. 8 1,340
<br />August 689 31 14 22.2 1,370
<br />September 486 21 12 16.2 964
<br />October 1.480 73 15 47.7 2,940
<br />November 3,101 190 58 103 6,150
<br />December 5.080 210 140 164 10.080
<br />Calendar year 1974 61,262 760 12 168 121,500
<br />
<br />Willow Creek above Heron Reservoir. near Park View, N. Mex.
<br />
<br />Location.--Water-stage recorder. 1at 36044'33", long 106037'34". in Tierra Amarilla Grant,
<br />on right bank 200 ft downstream from bridge, 0.2 mile downstream from Iron Spring Creek,
<br />3.3 miles west of Park View. and at mile 9.7. Datum of gage is 7,196.29 ft above mean
<br />sea level. Prior to Apr. 1. 1971 at site 900 ft downstream.
<br />
<br />DrainaRe area.--112 sq mi.
<br />
<br />Avera~e discharge.--7 years (1963-69) 11.5 cfs (8,330 acre-ft per year) prior to completion
<br />of Azotea tunnel.
<br />
<br />Extremes,--1962-74: Maximum discharge, 1.600 cfs Aug. II, 1967 (gage height, 3.88 ft); no
<br />flow at times most years.
<br />
<br />Remarks.-.Records good except those for winter months, which are poor. Subsequent to
<br />Nov. 16, 1970, flow affected by transmountain diversions through Azotea tunnel, Flow in
<br />Rutheron Drain included prior to Apr. 1, 1971.
<br />
<br />Monthly and yearly discharge, in cubic feet per second
<br />
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<br />
<br /> Second- Maximum Minimum Runoff in
<br />Month foo t - days da-ily daily Mean Acre-feet
<br />January 5.58 0.18 0.18 0.18 11
<br />February 5.94 .23 .18 .21 12
<br />March 2,588.4 245 .25 83.5 5,130
<br />April 4,608 382 58 154 9,140
<br />May 11,128 496 193 359 22,070
<br />June 4,741 304 25 158 9,400
<br />July 975.2 130 1.5 31. 5 1,930
<br />August 1,308.3 234 1.3 42,2 2,600
<br />September 32.43 3.9 .26 1. 08 64
<br />October 154.15 28 .27 4.97 306
<br />November 202.63 29 .27 6.75 402
<br />December 18.07 1.3 .32 .58 36
<br />Calendar year 1974 25,767.70 496 .18 70.6 51,110
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