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<br />Rio Grande near Del Norte, Colo.
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<br />Location.-Water_stage recorder, lat37"41 '22", long 106'27'38", InNWI/4 sec. 29, T. 4(} N., R. 5 E., on rlghtbank,20 ftdownslream fron
<br />county highway bridge, 6 miles West of Del Norte, and 18 mlles Upstream from Pinos Creek. Datum of gage is 7,980.25 ft abov,.
<br />mean sea level, datum of 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 />Averaee discharge._102 years (189IH99l), 905 It'/s (655,700 acre-It per year).
<br />Extremes.-1B89_1991: Maximum discharge, 18,000 fr'ls Oct. 5, 1911 (gage height, 6.80 ft), from rating curve extended above 12,900 It'/s;
<br />minimum daily, 69 fr'ls Aug. 21, 1902.
<br />Remarks.-&cOrds good except those for winter months, which are fair. Flow regulated by four reservoirs. total capadty 126,100 acre-
<br />ft, and by several smaller ones. Six transmountain diversions import water into basin above station.
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<br />STREAMFLOW
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<br /> Monthly and yearly discharge, in cubic feet per second
<br /> SeconJ- Maximum Minimum Runoff in
<br />Month foot-days daily dail Mean acre-feet
<br />lanuary 5,410 200 150 175 10,730
<br />February 5,500 220 170 196 10,910
<br />March 6,899 260 192 223 13,680
<br />April 25,846 1,490 273 B62 51,270
<br />May 90,666 4,54(} 741 2,925 179,800
<br />June 84,120 4,34(} 1,860 2,804 166,900
<br />July 31,384 1,910 580 1,012 62,250
<br />August 16,078 722 335 519 31,890
<br />September 18,892 1,080 315 630 37,470
<br />October 9,117 410 248 294 18,080
<br />November 7,008 305 146 234 13,900
<br />December 5,336 200 150 172 10,580
<br />Calendar year 1991 306,256 4,54(} 146 839 607,500
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<br />Conejos River below Platoro ReservOir, Colo.
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<br />Location.-Water_stage recorder and conCrete control, lat 37"21'18", long 106'32'37", in NWI/4NW1/4 sec. 22, T. 36 N., R. 4 E., on left
<br />bank 1,100 ft downstream from valve house for Piatoro Reservoir, and 0.7 mile northwest of Piatoro. Datum of gage is 9,866.60 ft
<br />above mean sea level (levels by Bureau of Reclamation),
<br />Drainage area.-40 sq mi, approximately.
<br />A veraee discharge._39 years (1953-91), 93.0 It'/s (67,380 acre-It per year).
<br />Extremes.-1952_91: Maximum discharge, 1,160 fr'ls Nov. 1, J957; maximum gage height, 4.29 ft June 15, 1958; no flow Oct. 16-20, 1955.
<br />Remarks'-&COrds good except those for winter months, which are fair. No diversions above station. Flow completely regulated by
<br />P1atoro Reservoir (capacity, 59,570 acre-it).
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<br /> Monthly and yearly discharge, in cubic feet per second
<br /> Second_ Maximum Minimum Runoff In
<br />Month foot-days daily daily Mean acre-feet
<br />l11uary 99.2 3.2 3.2 3.20 197
<br />ebruary 89.6 3.2 3.2 3.20 178
<br />larch 99.2 3.2 3.2 3.20 197
<br />pril 993.6 108 3.2 33.1 1,970
<br />ay 6,620 629 4(} 214 13,130
<br />ne 6,155 576 41 205 12,210
<br />Iy 7,822 398 14(} 252 15,510
<br />IgUst 4,959 295 64 160 9,840
<br />?tember 4,076 204 68 136 8,080
<br />iober 827.2 55 3.8 26.7 1,64(}
<br />vember 114.3 4.1 3.8 3.81 227
<br />~ember ]]7.8 3.8 3.8 3.80 234
<br />endar year 1991 31,972.9 629 3.2 87.6 63,420
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