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<br />33
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<br />Rio Grande near Del None, Colo.
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<br />Location. --Water-stage recorder, lat 37041'20", long 106"27'30", In NWi sec. 29, T. 40 N., R. 6 E., on right
<br />bank, 20 ft downslream from County highway bridge, 5 miles upstream from Pinos Creek, and 6 miles West
<br />of Del Norte. Datum of gage Is 7,960.25 fl above mean sea level, datum of 1929. Prior to May 16, 1906,
<br />staff gage at site 4 miles downstream. Records are equivalent.
<br />
<br />Drainage,area. --I, 320 sq mi, apprOximately.
<br />
<br />Average dIscharge. --61 years (1990-1970), 909 cfs (658,600 acre-ft per year).
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<br />Extremes. --1889-1970: Maximum discharge, 18, 000 cfs Oct. 5, 1911 (gage height, 6. 80 ft), from rating curve
<br />extended above 6,000 cis; minimum daily, 69 cis Aug. 21, 1902.
<br />
<br />Remarks. --Records excellent except for SOme winter months, which are fair. Flow regulated by fOUr reservoirs,
<br />total capacity 126, 100 acre-ft, and by several smal1er ones. Six transmountain diversions import water into
<br />baSin above station.
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<br /> 0 ""'- ~a~ Be a~ mc Ie ee~ per Becan
<br />Month Second_ Maximum Minimum Mean RunOff in
<br /> foot. days daily daily A ere-feet
<br />January 5,610 230 135 181 11,130
<br />February 5,435 210 165 194 10,780
<br />March 5,840 230 159 188 11,580
<br />April 10,670 839 177 356 21,160
<br />May 91,049 4,260 500 2,937 180,600
<br />June 71,230 2,930 2,030 2,374 141,300
<br />July 47,440 2,020 1,050 1,530 94, 100
<br />August 21,632 1,130 468 698 42, 910
<br />September 40, 888 4,990 474 I,363 81,100
<br />October 15,267 664 335 492 30,280
<br />November 9,219 371 237 307 18,290
<br />December 6,334 264 162 204 12,560
<br />Calendar year 1970 330,614 4,990 135 906 655,800
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<br />Conejos River below 'Platoro Reservoir, Colo.
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<br />Location. --Water-stage recorder and concrete control, !at 37"21'20", long 106032'35", in NWiNWi sec. 22,
<br />T. 36 N., R. 4 E., on left bank 1,500 ft downstream from value house for Platoro Reservoir and hati a
<br />mile northwest of Platoro. Datum of gage Is 9,866. 60 ft above mean sea level (levels by Bureau of
<br />Reclamation).
<br />
<br />DrainaR'e area. -~40 sq mi, approximately.
<br />Average diSCharge. --18 years (1953-70), 89.9 cfs (65, 130 acre-ft per year).
<br />Extremes. --1952-70: Maximum diSCharge, 1,160 cIs Nov. I, 1957; maximum gage height, 4.29 ft
<br />June IS, 1958; no flow Oct. 16-20, 1955.
<br />
<br />Remarks. --Records good except for those for winter months, which are poor. No diversions above station. Flow
<br />completely regulated by Platoro Reservoir (capaCity, 60, 000 acre~ft).
<br />
<br /> on ~an !..l.ea~ sc !l!t. m cu lC ee~r secon
<br />Month Second_ Maximum Minimum Mean Runoff in
<br /> foot-days daily daily Acre-feet
<br />January 263.5 - - 8.50 523
<br />February 240.8 - - 8.60 478
<br />March 269.7 - - 8.70 535
<br />April 362.5 25 8.7 12.1 719
<br />May 9,677 542 30 312 19,190
<br />June 10,704 494 194 357 21,230
<br />July 3,262 239 30 105 6,470
<br />August 1,158 88 20 37.4 2,300
<br />September 3,565 389 20 119 7,070
<br />October 1,027 52 20 33.1 2,040
<br />November 3,553.1 364 8.9 116 7,050
<br />December 285.3 - - 9.20 566
<br />Calendar year 1970 34,367.9 542 - 94.2 68, 170
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