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<br />C-": Rio Chama below 81 Vallo Dam, N. Mex.
<br />Location.--Water-stage recorder, lat 36<>34'48", long 106<>43'24", 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 Amaril1a, 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 />Drainaqe area.--877 sq mi.
<br />Averaqe discharqe.--4 years (1914, 1921-23), 444 ft3/s prior to completion of El Vado Dam; 35 years
<br />(1936-70), 372 ft3/s (269,500 acre-ft per year) subsequent to completion of El Vado Dam; but
<br />9 years (1971-79) 374 ft3/s (27I,OOO acre-ft per year) sUQsequent to completion of Heron Dam
<br />and Azotea tunnel.
<br />Extremes.--1914-16, 1920-24, 1936-79: Maximum discharge observed, 9,000 ft3js May 22, 1920 (gage
<br />height, 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 El 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 />RIO GRANDE COMPACT COMMISSION REPORT
<br />
<br /> Monthly and yearly discharge, in cubic feet per second
<br /> Month Second- Maximum Mi n imum fl[ean Runoff in
<br /> foot-days daily daily acre-feet
<br />January 2,161 114 40 69.7 4,290
<br />February 2,113 101 56 75.5 4,190
<br />March 10,160 1,100 83 328 20,150
<br />April 42,177 2,790 376 1,406 63,660
<br />May 62,492 3,320 508 2,016 124,000
<br />June 39,045 2,420 377 1,302 77 ,450
<br />July 9,566 768 91 309 18,970
<br />August 2,543 112 31 82.0 5,040
<br />September 14,742 1,000 25 491 29,240
<br />Dc tobe r 14 ,047 985 29 453 27,860
<br />November 1,746 387 45 58.2 3,460
<br />December 26,561 1,060 67 857 52,680
<br />Calendar year 1979 227,353 3,320 31 623 451,000
<br />
<br />Rio Chama below Abiquiu Uam, N. Mex.
<br />Location.--Water-stage recorder, lat 36014'12", long 106024'59", in SE\SE\ sec. 8, T. 23 [~., R. 5 E.,
<br />on rlght bank 0.8 mile downstream from Abiquiu Dam and 5.9 miles northwest of Abiquiu. Altitude
<br />of gage is 6,040 ft (from river-profile map and topographic map).
<br />Drainaqe area.--2,147 sg mi of which about 100 sq mi is probably noncontributing.
<br />Averaqe discharqe.--18 years (1962-79), 400 ft3js (289,800 acre-feet per year).
<br />Extremes.--1961-79: Maximulll discharge, 2,990 ft3js July 1, 1965 (gage height, 6.69 ft); minimum
<br />about 0.5 ft3/s Mar. 17, 1966.
<br />
<br />Remarks.--Records good except those for winter months, which are fair. Flow regulated by Heron,
<br />El Vado, and Abiquiu Reservoirs. Diversions above station 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 />Mon th Second- Max imum Minimum Mean Runoff in
<br /> foot-days daily daily acre- feet
<br />January 2,543 170 30 82.0 5,040
<br />February 3,150 195 58 113 6,250
<br />March 14,966 1,320 91 483 29,690
<br />April 35,168 1,670 453 1,172 69,760
<br />May 46,884 1,890 543 1,512 92,990
<br />June 29,911 1,240 298 997 59,330
<br />July 24,411 1,210 81 787 48,420
<br />August 3,049 365 33 98.4 6,050
<br />September 13,452 1,210 19 448 26,680
<br />OCtober 17,216 1,320 26 555 34,150
<br />November 351440 1,480 1,040 1,181 70,300
<br />December 28,644 1,140 19 924 56,820
<br />Calendar year 1979 254,834 1,890 19 698 505,500
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