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<br />Rio Grande near Del Norte, Colo.
<br />Location.--Water-stage recorder, lat 37041'22", long 106027'38", in NW~ 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
<br />1929. Prior to May 16, 1908, staff gage at site 4 miles downstream. Records are equivalent.
<br />Drainage area.--I,320 sq mi, approximately.
<br />Averaqe discharge.--90 years (1890-1979), 897 ft3/s (649,900 acre-Et per year).
<br />Extremes.--1889-1979: Maximum discharge! 18,000 ft3/s Oct. S, 1911 (gage height, 6.80 ft), from
<br />rating curve extended above 12,900 ftJ/s; minimum daily, 69 ft3/s Aug. 21, 1902.
<br />Remarks.--Records good except for some winter months, which are fair. Flow regulated by four
<br />reservoirs, total capacity 126,100 acre-ft, and by several smaller ones. Six transmountain
<br />diversions import water into basin above station.
<br />
<br />Monthly and yearly discharge, in cubic feet per second
<br />
<br /> Month Second- Max imum Min imum Mean Runoff in
<br /> foot-days daily daily acre-feet
<br />January 4,065 160 105 131 8,060
<br />February 3,960 160 120 141 7,850
<br />March 6,355 245 155 205 12,610
<br />Apr il 27,870 2,060 20B 929 55,280
<br />May 117,370 7,830 1,580 3,786 232,800
<br />June 176,350 7,720 4,320 5,878 349,800
<br />July 86,670 4,580 1,500 2,796 171,900
<br />August 27,964 1,370 494 902 55,470
<br />September 10,772 '62 23B 359 21,370
<br />Dc tober 7,199 310 19B 232 14,280
<br />November 6,373 277 150 212 12,640
<br />December 6,295 225 IBO 203 12,490
<br />Calendar year 1979 481,243 7,830 105 1,318 954,500
<br />
<br />Conejos River below Platoro Reservoir, Colo.
<br />
<br />Location.--Water-stage recorder and concrete control, lat 37021'18", long 106032'37", in NWl,NWl,
<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 sq mi, approximately.
<br />
<br />Averaqe discharge.--27 years (1953-79), 87.6 ft3/s (63,470 acre-ft per year).
<br />
<br />Extremes.--1952_79: Maximum discharge, 1,160 ft3/s Nov. 1, 1957; maximum gage height, 4.29 ft
<br />June IS, 1958; no flow Oct. 16-20, 1955.
<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, 60,000 acre-it).
<br />
<br />Monthly and yearly discharge, in cubic feet per second
<br />
<br /> Month Second- Maximlll1l Minimum Mean Runoff in
<br /> foot-days daily daily acre-feet
<br />January 186.0 6.0 6.0 6.00 369
<br />Feburary 277.0 13 6.0 9.89 549
<br />March 309.0 13 9.0 9.97 613
<br />Apr il 495.5 59 9.0 16.5 9B3
<br />May 12,077 622 37 390 23,950
<br />June 11,340 765 4B 37B 22,490
<br />July 10,532 636 116 340 20,890
<br />August 2,336 167 21 75.4 4,630
<br />September 394.0 32 5.0 13.1 7B1
<br />October 156.2 17 2.0 5.04 310
<br />November 153.4 6.0 4.B 5.11 30.
<br />December 208.9 12 5.0 6.74 414
<br />Calendar year 1979 38,465.0 765 2.0 105 76,300
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