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<br />RIO GRANDE COMPACT COMMISSION REPORT
<br />
<br />Rio Chama below El Vado Dam, N. Hex.
<br />
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<br />
<br />Loc.ation.--Water-stage recorder, lat 36034'48", long 106043'24", in Tierra Amarilla Grant, 1.5 miles
<br />downstream from El Vado Dam, 2.8 miles upstream from Rio Nutrias, and 13 miles southwest of
<br />Tierra Amarilla, Rio Arriba County. Datum of gage is 6.696.12 ft above mean sea level, datum of
<br />1929. Prior to October 1935, at site 1.5 miles upstream and October 1935 to September 1938, at
<br />site 1.1 miles upstream at different datum.
<br />
<br />Drainap;e area.--877 sq mi.
<br />
<br />Averap;e discharge.--4 years (1914, 1921-23). 444 cfs prior to completion of El Vado Dam; 35 years
<br />(1936-70), 372 cfs (269,500 acre-ft per year) subsequent to completion of E1 Vado Dam; but 6 years
<br />(1971-76) 352 cfs (255,000 acre-ft per year) subsequent to completion of Heron Dam and Azotea tunnel.
<br />
<br />Extremes.--19l4-l6, 1920-24, 1936-76: Maximum discharge observed, 9.000 cfs May 22, 1920 (gage height,
<br />12 ft); no flow Mar. 25. 26, 31. 1955.
<br />
<br />Remarks.--Records good. Diversions above station for irrigation of about 8,000 acres. Since 1935
<br />flow regulated by E1 Vado Reservoir and since October 1970 flow partly regulated by Heron Reservoir.
<br />Subsequent to May 1971 flow affected by releases of transmountain water from Heron Reservoir.
<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 11,428 1.490 16 369 22,670
<br />February 496 18 16 17 .1 984
<br />March 3.486 896 16 112 6.910
<br />April 23,547 1,530 52 785 46,710
<br />May 32.842 1,820 58 1,059 65,140
<br />June 5.581 418 107 186 11,070
<br />July 17.607 651 323 568 34,920
<br />August 17,795 1.130 52 574 35.300
<br /> 20,770 928 91 692 41.200
<br />September 4.710 428 40 152 9,340
<br />October 43.9 2,610
<br />November 1.316 96 24
<br />December 3,446 534 ,. 111 6,840
<br />Calendar year 1976 143,024 1,820 16 391 283,700
<br />
<br />Rio Chama below Abiquiu Dam, N. Mex.
<br />
<br />Location.--Water-stage recorder, lat 36014'12", long 106024'59", in sE\sEll; sec. 8. T. 23 N.. R. 5 E., on
<br />right bank 0.8 mile downstream from Abiquiu Dam and 5.9 miles northwest of Abiquiu. Altitude of gage
<br />is 6,040 ft (from river-profile map and topographic map).
<br />
<br />Drainap;e area.--2,147 sq mi of which about 100 sq mi is probably noncontributing.
<br />
<br />Avera~e dischar~e.--15 years (1962-76), 385 cfs (278,900 acre-feet per year).
<br />
<br />Extremes.--1961-76: Maximum discharge, 2,990 cfs July 1, 1965 (gage height, 6.69 ft); minimum about
<br />0.5 ds lfar. 17, 1966.
<br />
<br />Remarks.--Records good except those for winter months, which are fair. Flow regulated by Heron,
<br />E1 Vado, and Abiquiu Reservoirs. Diversions above ststion for irrigation of about 17,000 acres.
<br />Subsequent to May 1971 flow affected by the release of transmountain water.
<br />
<br />Monthly and yearly discharge, in cubic feet per second
<br />
<br /> Month Second- Maximum Minimum Mean Runoff in
<br /> foot-days daily daily acre-feet
<br />January 14,644 1.530 30 472 29.050
<br />February 1,195 71 32 41.2 2,370
<br />March 2,646 280 38 85.4 5.250
<br />April 10.287 1,210 50 343 20,400.
<br />May 34,113 1,550 130 1,100 67.660
<br />June 5,509 477 78 184 10.930
<br />July 18.497 693 457 597 36.690
<br />August 19,474 1,200 66 628 38.630
<br />September 23,374 985 128 779 46,360
<br />October 4,831 372 39 156 9,580
<br />November 1,778 127 32 59.3 3,530
<br />December 3.646 449 28 118 7,230
<br />Calendar year 1976 139,994 1.550 28 382 277,700
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