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<br />STREAMFLow 33
<br />
<br />Rio Grande near Del Norte. Colo.
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<br />
<br />Location.--Water-stage recorder. lat 37"41'22". long 106"27'38". in ~ sec. 29. T. 40 N.. R. 5 E..
<br />on right bank. 20 ft downstream from county highway bridge. 5 miles upstream from Pinos Creek,
<br />and 6 miles west of Del Norte. Datum of gage is 7.980.25 ft above mean sea level. datum of 1929.
<br />Prior to May 16. 1908. staff gage at site 4 miles downstream. Records are equivalent.
<br />
<br />DrainaRe area.--l.320 sq mi. approximately.
<br />
<br />AVera~e d1scharge.--87 years (1890-1976), 903 cfs (654,200 acre-ft per year).
<br />
<br />Extremes.--1889-1976: Maximum discharge, 18.000 cfs Oct. 5. 1911 (gage height, 6.80 ft). from
<br />rating curve extended above 6,000 cfs; minimum daily, 69 cfs Aug. 21. 1902.
<br />
<br />Remarks.--Records good except for Some winter months, which are fair. Flow regulated by four
<br />reservoirs, total capacity 126.100 acre-ft, snd by several smaller ones. Six transmountain
<br />diversions import ~ater into basin above station.
<br />
<br />~funthly 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 5,135 175 150 166 10,190
<br />February 5,195 210 165 179 10,300
<br />March 8,855 443 215 286 17.560
<br />April 18,160 1,080 330 605 36,020
<br />May 82.210 4.220 1,020 2,652 163,100
<br />June 91,890 4,800 1,660 3.063 182,300
<br />July 37,548 2,290 481 1.211 74,480
<br />August 16,813 696 413 542 33.350
<br />September 12,011 507 280 400 23,820
<br />October 11,736 574 212 379 23,280
<br />November 5,338 217 101 178 10,590
<br />December 3.455 150 75 111 6,850
<br />Calendar year 1976 298,346 4,800 75 81S 591.800
<br />
<br />Conejos River below Platoro Reservoir, Colo.
<br />
<br />Location.-Wster_stage recorder and concrete control, 1at 37"'21'18", long 106"32'37", in ~
<br />sec..22. T. 36 N.. R. 4 E., on left bank 1,100 ft downstream from valve house for P1atoro Reservoir.
<br />and 0.7 mile northwest of Platoro. Datum of gage is 9.866.60 ft above mean sea level (levels by
<br />Bureau of Reclamation).
<br />
<br />DrainaRe area.--40 sq mi, approximately.
<br />
<br />AVerSRe d1scharRe.-24 years (1953-76). 89.0 cfs (64,480 acre-ft per year).
<br />
<br />/'
<br />
<br />Extremes.-~1952_76:
<br />June 15. 1958; no
<br />
<br />Maximum discharge, 1,160 cfs Nov. 1. 1957; maximum gage height, 4.29 ft
<br />flow Oct. 16-20, 1955.
<br />
<br />,
<br />Re~rks.--Records good except those for winter months, which are fair. No diversions above station.
<br />Flow completely regulated by Platoro Reservoir (capaCity, 60,000 acre-ft).
<br />
<br />MOnthly and yearly discharge, in cubic feet per second
<br />
<br />.
<br />Month Second- Ifax1mum Minimum Mean Runoff in
<br /> foot-days daily daily acre-feet
<br />January 310 10 10 10.0 615
<br />February 290 10 10 10.0 575
<br />March 310 10 10 10.0 615
<br />April 712 96 10 23.7 1,410
<br />May 8,981 61.0 81 290 17,810
<br />June 13,834 745 215 461 27.440
<br />July 3,119 275 24 101 6.190
<br />August 924.2 81 7.0 29.8 1,830
<br />September 6S6.2 56 9.2 21.9 1.300
<br />October 790 81 12 25.5 1,570
<br />November 1,567 302 10 52.2 3,110
<br />December 310 10 10 10.0 615
<br />Calendar year 1976 31,803.4 745 7.0 86.9 63,080
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