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<br />RIO GRANDE COMPACT COMMISSION REPORT
<br />
<br />Willow Creek below Heron Dam, N. Mex.
<br />Location.--Totalizing flowmeters, lat 36039'5611, long 1060l.j2'121!, in Tierra Amarilla Grant,
<br />in outlet conduits at Heron Dam, 0.2 mile upstream from Rio Chama, 5.1 miles northeast
<br />of El Vado Dam, and 8.7 miles southwest of Park View.
<br />
<br />(, ,)
<br />
<br />'--
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<br />Draina~e area.--193 sq mi.
<br />Extremes.--1971-72: Maximum daily discharge, 1,160 cfs Dec. 21, 1972; no flow at times.
<br />
<br />Remarks.--Records good. Flow completely regulated by Heron Dam. Releases of San Juan
<br />(transmountain) water amounted to 3,270 acre-ft 1n May; 5,920 acre-ft in June; 8,850 acre-
<br />ft 1n July, 4,000 acre-ft in August; 10 acpe-ft in October; 30 acre-ft in November, and
<br />17,660 acre-ft in December.
<br />
<br /> Monthlv and vearl discharge in cubic feet ner second
<br /> Second- Maximum Hinimum Runorf in
<br />~lonth foot-da"s dailv dailv Mean Acre-feet
<br />January 59.5 4.0 0 1. 92 118
<br />February 1,639.0 344 0 56.5 3,230
<br />March 1,158.1 262 0 37.4 2,300
<br />April 66.0 7.8 0 2.20 131
<br />l\I:ay 2,289.3 251 0 73.8 4,SLJO
<br />June 3,480 216 10 116 6,900
<br />July 4,610.2 275 5.5 149 9,lLJO
<br />August 2,120.5 219 0 68.4 4,210
<br />September 483.92 222 0 16.1 960
<br />October 745.5 109 0 24.0 1,480
<br />t!ovember 457.6 76 0 15.3 910
<br />December 8 925 1 160 0 288 17 710
<br />Calendar year 1972 26,034.62 1,160 0 71.1 51,640
<br />
<br />Rio Chama below El Vado Dam, N. Mex.
<br />Location .--Water-sta!?e recorder, lat 36034148", long 106043 I 24", in Tierra Amari11a Grant, 1.5
<br />r:liles downstrear.l froF.! El Vado Dam, 2.8 miles upstream from Rio Nutrias, and 13 miles south-
<br />west of Tierra A~arilla, Rio Arriba County. Datum of gage is 6,696.12 ft above mean sea
<br />level, datum of 1929. Frior to October 1935, at site 1.5 miles upstream and October 1935
<br />tc SepteMber 1938. at site 1.1 miles upstream at different datum.
<br />Draina~e area.--877 sq mi.
<br />Average dischar~e.--4 years (19l~, 1921-23), 444 crs prior to completion of E1 Vado Dam;
<br />35 years (1936-70), 372 cfs (269.500 acre-ft per year) subsequent to completion of E1 Vado
<br />Da~ but prior to completion of Heron Dam and Azotea tunnel.
<br />
<br />ExtreQes.--1914-16, 1920-24, 1936-72: Maximum discharge observed, 9.000 efs May 22, 1920
<br />(gage height, 12 ft); no flow !>1ar. 25, 26, 31, 1955.
<br />
<br />Remarks.--Records good except those for some winter Months, which are poor. Diversions above
<br />station for irrigaticn of about 8,000 acres. Since 1935 flow regulated by El Vado Reservoir
<br />and since October 1970 flow partly regulated by Heron Reservoir. Subsequent to May 1971
<br />flow affected by releases of San Juan water from Heron Reservoir.
<br />
<br /> [l'!onthlv and vearl'\! discharge in cubic feet per second
<br /> Second Maxir:mm Minimum Runoff in
<br />f<Ionth foot-davs dail v daily Mean Acre-feet
<br />January 1,988 72 50 64.1 3,940
<br />February 4,393 645 50 151 8,710
<br />March 10.1.J01 480 125 336 20,630
<br />April 111326 597 208 378 22,470
<br />May 8,123 381 158 262 16,110
<br />June 6,699 331 103 223 13,290
<br />July 6,017 386 25 194 11,930
<br />August 3,469 269 20 112 6,880
<br />September 1,519 304 13 50.6 3,010
<br />October 7,691 1,250 11 248 15,260
<br />November 5,615 301 78 187 11,140
<br />December 2 893 133 67 93,3 5 740
<br />Calendar year 1972 70,134 1,250 11 192 139,100
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