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<br />STREA/J]FLOW
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<br />
<br />Rio Grande near Del Norte, Colo.
<br />
<br />Location.--Water-stage recorder, lat 37041'22" long 106027'38", in NW.\ sec.
<br />on right bank, 20 ft downstream from county highway bridge, 6 miles west
<br />6.8 miles upstream from Pinos Creek. Datum of gage is 7,980.25 ft above
<br />of 1929. Prior to May 16, 1908, staff gage at site 4 miles downstream.
<br />
<br />29, T. 40 N., R. 5 E.,
<br />of Del Norte, and
<br />mean sea level, datum
<br />Records are equivalent.
<br />
<br />"
<br />
<br />Drainage area.--l,320 sq mi, approximately.
<br />Average discharqe.--98 years (1890-1987), 913 ft3/s (661,SOO acre-ft per year).
<br />Extremes.--1889-1937: Maxiraum disChargej 18,000 ft3/s Oct. 5, 19j-l (gage height, 6.80 ft), from
<br />rating curve extended above 12,900 ft Is; minimum daily, 69 ft /s Aug. 21, 1902.
<br />
<br />Remarks.--Records good except those for winter months, which are fair. FloW'
<br />reservoirs, total capacity 126,100 acre-ft, and by several smaller ones.
<br />diversions import water into baSin above statiOn.
<br />
<br />regulated by four
<br />Six transmountain
<br />
<br /> Monthly and yearly discharge, in cubic feet per second
<br /> Month Second- Maximum l1inimum Mean
<br /> foot-days daily daily
<br />January 8,850 330 240 285
<br />February 8,361 330 242 299
<br />l1arch 11,160 514 259 360
<br />Apr il 39,920 3,580 346 1,331
<br />May 136,230 6,920 2,730 4,395
<br />June 160,320 7,150 3,320 5,344
<br />July 69,510 3,560 1,640 2,242
<br />August 36,343 1,890 737 1,172
<br />September 15,277 642 395 509
<br />October 11,404 494 305 366
<br />November 8,459 449 190 282
<br />December 7,080 280 150 228
<br />Calendar year 1987 512,914 7,150 150 1, 405
<br />
<br />Conejos River below Platoro Reservoir, Colo.
<br />
<br />Runoff in
<br />acre-feet
<br />
<br />17,550
<br />16,5BO
<br />22,140
<br />79,180
<br />270,200
<br />318,000
<br />137,900
<br />72,090
<br />30,300
<br />22,620
<br />16,780
<br />14,040
<br />
<br />1,017,400
<br />
<br />LOcation.--Water_stage recorder and concrete control, lat 37021'16", long 106"32'37", in NW,NW,
<br />sec. 22, T. 36 N., R. 4 E., on left bank 1,100 ft downstream from valve house for Platoro
<br />Reservoir, and 0.7 mile northwest of Platoro. Datum of gage is 9,866.60 ft abOve mean sea
<br />level (levels by Bureau of Reclamation).
<br />
<br />Drainaqe area.--40 sg mi, approximately.
<br />Averaqe discharqe.--35 years (1953-87), 93.7 ft3/s (67,890 acre-ft per year).
<br />
<br />Extremes.--1952_87:
<br />June 15, 1958; no
<br />
<br />Maximum diSCharge, 1,160 ft3/s Nov. 1, 1957; maximum gage
<br />flow Oct. 16-20, 1955.
<br />
<br />height, 4.29 ft
<br />
<br />Remarks.--Records good except those for winter months, which are fair. No diversions above
<br />station. Flow completely regulated by Platoro Reservoir (capacity, 59,570 acre-ft).
<br />
<br /> MOnthly and yearly diSCharge, in cubic feet per second
<br /> Month Second- Maximum Minimum Mean
<br /> foot-days daily da ily
<br />January 1,116 36 36 36.0
<br />Feburary 1,008 36 36 36.0
<br />Harch 657 36 15 21. 2
<br />Apr il 5,154.1 416 B.5 172
<br />May 9,845.0 B08 9.3 318
<br />June 9,586 612 13 320
<br />July 7,231 306 172 233
<br />August 2,675 202 33 86.3
<br />September 620 29 10 20.2
<br />October 315.6 25 7.7 10.2
<br />November 498.8 48 6.9 16.6
<br />December 310 10 10 10.0
<br />Calendar year 1987 39,016.5 808 6.' 107
<br />
<br />Runoff in
<br />acre-feet
<br />
<br />2,210
<br />2,000
<br />1,300
<br />10,220
<br />19,530
<br />19,010
<br />14,340
<br />5,310
<br />1,230
<br />626
<br />989
<br />615
<br />
<br />77 ,390
<br />
<br />
<br />33
<br />
<br />
<br />
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