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<br />RIO GRANDE COMPACT COMMISSION REPORT
<br />
<br />Willow Creek below Heron Dam, N. Mex.
<br />Location.--Totalizing flowmeters, lat 36039'56", long 106042'12", in Tierra Amarilla Grant,
<br />1n 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 />Draina2e area..-193 sq mi.
<br />Extremes.--1971.73: Maximum daily discharge, 2,220 cfs Dec. 12, 1973; no flow at times.
<br />Remarks.--Records good. Flow completely regulated by Heron Dam.
<br />
<br /> Monthly and vearlv dischan!:e in cubic feet TIer second
<br />Month Second- Maximum Minimum Mean Releases in Acre-feet
<br />foot. days daily daily *TMW Total
<br />January 86.2 20 0 2.78 0 171
<br />February 290.5 40 0 10.4 0 576
<br />March 2,847 302 0 91.8 5 5,650
<br />April 7,401 781 14 246.7 0 14,680
<br />May 1,030 261 0 33,2 11 2,040
<br />June 0 0 0 0 0 0
<br />July 964.7 103 0 31.1 11 1,910
<br />August 1,467.2 155 0 47.3 16 2,910
<br />September 61 29 0 2.03 25 121
<br />October 8,1 8.1 0 .26 16 16
<br />November 1,131 283 0 37.7 2,240 2,240
<br />December 19,429 2,220 0 627 38,540 38,540
<br />Calendar year 1973 34,715.7 2,220 0 95.1 40,860 68,860
<br />
<br />*Transmountain Water
<br />
<br />Rio Chama below El Vado Dam. N. Mex.
<br />
<br />Location. --Water-stage recorder, lat 36034 r 48", long 106043' 24", in Tierra Amarilla Grant, 1.5
<br />rn11es downstream from E1 Vado Darn, 2.8 miles upstream from Rio Nutrias, and 13 miles south-
<br />west of Tierra Amaril1a, Rio Arriba County. Datum of gage is 6.696.12 ft above mean sea
<br />level, datum of 1929. Prior to October 1935. at site 1.5 miles upstream and October 1935
<br />to September 1938, at site 1.1 miles upstream at different datum.
<br />Drainage area.--877 sq mi.
<br />Avera2e diSchi~g~.--4 years (1914. 1921-23), 444 cfs prior to completion of E1 Vado Dam;
<br />3S years ( 3 -70), 372 cfs (269,500 acre-ft per year) subsequent to completion of E1 Vado
<br />Dam but prior to completion of Heron Dam and Azotea tunnel.
<br />Extremes..-19l4.16. 1920-24, 1936-73: Maximum discharge observed. 9,000 cfs May 22, 1920
<br />(gage height, 12 ft); no flow Mar. 25, 26, 31, 1955.
<br />
<br />Remarks.--Records good except those for some winter months. which are poor. Diversions above
<br />station for irrigation of about 8,000 acres. Since 1935 flow regulated by E1 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 /> Monthly and year Iv discharl!:e, in cubic feet per second
<br />Month Second- Maximum Minimum Mean Runoff in
<br />foot-days daily daily Acre-feet
<br />January 2,695 122 57 86.9 5,350
<br />February 2,089 125 24 74.6 4.140
<br />March 861 30 26 27.8 1,710
<br />April 995 49 27 33.2 1,970
<br />May 77,469 5.790 49 2,499 153.700
<br />June 33,212 2,060 663 1,107 65,880
<br />July 7,444 664 148 240 14,770
<br />August 12,228 638 80 394 24,250
<br />September 14,699 619 125 490 29,160
<br />October 5.001 361 42 161 9,920
<br />November 2.188 306 32 72.9 4,340
<br />December 20,594 2,230 35 664 40,850
<br />Calendar year 1973 179,475 5.790 24 492 356,000
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