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<br />36
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<br />RIO GRANDE COMPACT COMMISSION REPORT
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<br />Rio Grande near Lobatos, Colo.
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<br />Location.--water-stage recorder, lat 37004'42", long 105Q45'22", in sec. 22, T. 33 N., R. 11 E., on
<br />rlght bank .just downstream from highway bridge, 6 miles north of Colorado-New Mexico State line,
<br />10 miles east of Lobatos, and 14 miles east of Antonito. Datum of gage is 7,427.63 ft above mean
<br />sea level, datum 1929.
<br />
<br />Drainaqe area.--7,700 sq mi, approximately (includes 2,940 sq roi in closed basin in San Luis valley).
<br />Averaqe discharge.--31 years (1900-30), 846 ft3js (598,400 acre-ft per year); 49 years (1931-79)
<br />411 ft~/5 (297,800 acre-ft per year).
<br />Extremes.--1899-1979: Maximum discharge observed, 13,200 ft3js June 8, 1905, (gage height, 9.1 ft),
<br />from rating curve extended above B,OOO ft3/s~ no flow at times in 1950-51, 1956.
<br />
<br />Remarks.--Records good except those for winter months, which are fair. Natural flow of streams
<br />affected by transmountain diversions,' storage reservoirs, ground-water withdrawals and diversions
<br />for irrigation, and return flow from irrigated areas.
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<br /> Monthly and year ly discharge, in cubic feet per seconn
<br /> Month Second- Maximum Minimum Mean Runoff in
<br /> foot-days da ily daily acre-feet
<br />January 5,270 190 155 170 10,450
<br />February 5,625 250 180 201 11 , 160
<br />March 12,54B 587 250 405 24,B90
<br />Apri 1 24,696 1,520 385 823 4B,9BO
<br />May 64,610 4,020 952 2,OB4 12B,200
<br />June 10B,320 4,690 3,060 3,611 214,900
<br />July 62,200 2,960 1,OBO 2,006 123,400
<br />August 20,071 1,020 212 647 39, BID
<br />September 2,261 192 41 75.4 4,480
<br />October 1,537 92 37 49.6 3,050
<br />November 3,230 133 71 108 6,410
<br />December 5,125 200. 105 165 10,170
<br />Calendar year 1979 315,493 4,690 37 864 625,BOO
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<br />willow Creek above Heron Reservoir, near Los Ojos, N. Hex.
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<br />Location.--Water-stage recorder, lat 36044133".
<br />bank 200 ft downstream from bridge, 0.2 mile
<br />Los Ojos, and at mile 9.7. Datum of gage is
<br />1971 at site 900 ft downstream.
<br />
<br />long 106037'34", in Tierra Amari11a
<br />downstream from Iron Spring Creek,
<br />7,196.29 ft above mean sea level.
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<br />Grant, on right
<br />3.3 miles west of
<br />Prior to Apr. 1,
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<br />Drainaqe area.--112 sq mi.
<br />Averaqe disCharie.--7 years (1963-69) 11.5 ft3/s (B,330 acre-ft per year) prior to completion of
<br />Azotea tunne ; 10 years (1970-79) 125 ft3/s (90,500 acre-ft per year) subsequent to completion of
<br />Azotea tunnel.
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<br />Extremes.--1962-79: Maximum discharge, 1,600 ft3/s Aug. 11, 1967 (gage height, 3.88 ft)~ no' flow
<br />at t1mes prior to 1971.
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<br />Remarks.--Records good except those for winter months, which are fair. Subsequent to Nov. 16, 1970,
<br />flow affected by transmountain diversions through Azotea tunnel. Flow in Rutheron Drain included
<br />prior to Apr. 1, 1971.
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<br /> Monthly and yearly discharge, in cubic feet per second
<br /> Month Second- Maximum Hin imum Mean Runoff in
<br /> foot-days daily daily acre-feet
<br />January 25.60 2.0 0.03 0.83 51
<br />February 164.1 10 2.1 5.86 325
<br />March 1,669.8 160 6.2 53.9 3,310
<br />Apr il 15,454 876 46 515 30,650
<br />May 25,067 1,090 350 809 49,720
<br />June 29,292 1,090 792 976 58,100
<br />July 15,902 990 173 513 31,540
<br />August 2,788 227 12 89.9 5,530
<br />september 31.14 10 .08 1.04 62
<br />October 11. 75 2.7 .08 .38 23
<br />November 5.52 .26 .11 .18 11
<br />December 3.81 .19 .10 .12 7.6
<br />Calendar year 1979 90,414.72 1,090 .03 248 179,300
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