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<br />RIO GRANDE COMPACT COMMISSION REPORT
<br />
<br />Rio Grande near Lobatos, Colo.
<br />
<br />Location.-Water-stage recorder, lat 37'04'42", long IOs04S'22", in see, 22, T. 33 N., R, Jl E., on right bank at highway bridge, 6 miles
<br />north of Colorado-New Mexico State line, 10 miles east of Lobat06, and 14 miles east of Antonito, Datum of gage is 7,427.63 It above
<br />mean sea level, datum of 1929.
<br />Drainaee area.-7,700 sq mi, approximately (includes 2,940 sq mi in dosed basin in San Luis Valley).
<br />Averaee discharee,--31 years (1900-30), 846 ft' /s 1612,900 acre-It per year); 66 years (1931-96) 448 ft' /s (324,600 acre,ft per year).
<br />Extremes.-1899-1996: Maximum discharge observed, 13,200 ft' /s June 8, 1905 (gage height, 9.1 ft!, from rating curve extended above
<br />8,000 f~ / s; no flow at times in 1950-51, 1956.
<br />Remarks.-,Records good except those for winter months, which are fair, Natural flow of stream affected by transmountain diversions,
<br />storage reservoirs, ground-water withdrawals and diversions for irrigation, and return flow from irrigated areas.
<br />
<br /> Monthly and yearly discharge, in cubic feet per second
<br /> Second- Maximum Minimum Runoff in
<br />Month foot-days daily daily Mean acre.fcet
<br />January 10,835 395 315 350 21.490
<br />February 14,314 609 375 494 28,390
<br />March 12,543 522 245 405 24,880
<br />April 6,150 356 105 205 12,200
<br />May 4,990 219 82 161 9,900
<br />June 1,842 80 48 61,4 3,650
<br />July 913 56 15 29.5 1,810
<br />August 975 52 15 31.5 1.930
<br />September 1,027 44 27 34,2 2,040
<br />October 1,688 101 38 54.5 3,350
<br />November 3,370 165 95 112 6.680
<br />December 7.010 325 95 226 13.900
<br />Calendar year 1996 65,657 609 15 179 130.200
<br />
<br />Willow Creek above Heron Reservoir, near Los Ojos, N. Mex,
<br />
<br />Location,-Water-stage recorder, 'at 36"44'33", long 106'37'34", in Tierra Amarilla Grant, on right bank 200 It downstream from bridge,
<br />0.2 mile downstream from Iron Spring Creek, 3.3 miles west of Los Ojos, and at mile 9.1. Datum of gage is 7,196.29 ft above mean
<br />sea level. Prior to Apr. I, 1971, at site 900 ft downstream.
<br />Oraina2e area.-112 sq mi.
<br />Averaee dischar~e.-7 years (l963-69),II.Slt' /. (8,330 acre-It per year) prior to completion of Azotea tunnel; 27 years (\970-%).136 It' /.
<br />(98,530 acre-ft per year) subsequent to completion of Azotea tunnel.
<br />Extremes.~-1962-96: Maximum discharge, 1,610 ft' /s Mar. 12, 1985 (gage height, 6.65 ft)j no flow at times.
<br />Remarks.-Rerords good except those for winter months, which are fair. Subsequent to Nov. 16, 1970, flow affected by transmountain
<br />diversions through Azatea runnel. Flow in Rutheron Orain included prior to Apr. I, 1971.
<br />
<br /> Monthly and yearly discharge, in cubic feet per second
<br /> Sccond~ Maximum Minimum Runoff in
<br />.- Month foot-days daily daily Mean acre-feet
<br />8
<br />> January 3.41 0.11 0.11 0.11 6.8
<br />:\': February 45.71 7,0 ,11 1,58 91
<br />.
<br />-' March 791.60 117 .00 25.5 1,570
<br />!';.. April 8.388 655 135 280 16,640
<br />~ May 15,572 814 106 502 30,890
<br />1:_ June 3.076 191 21 103 6,100
<br />.' July 1,581.9 246 3.5 51.0 3,140
<br /> August 103,70 13 ,50 3.35 206
<br /> September 169,60 48 .50 5,65 336
<br /> October 140.10 42 .50 4.52 278
<br /> November 416.8 45 1.5 13,9 827
<br /> December 16,50 10 .00 .53 33
<br /> Calendar year 1996 30.305,32 814 .00 82,8 60,110
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