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<br />Location.--Water-stage recorder, lat 37005', long 105045', in
<br />on right bank just downstream from highway bridge, 6 miles
<br />State line, 10 miles east of Lobatos, and 14 miles east of
<br />7,426.79 ft above mean sea level, datum of 1929.
<br />
<br />RIO GRANDE COMPACT COMMISSION REPORT
<br />
<br />Rio Grande near Lobatos, Colo.
<br />
<br />sec. 22, T. 33 N., R. 11 E.,
<br />north of Colorado-New Mexico
<br />Antonito. Datum of gage is
<br />
<br />Drainage area.--7,700 sq mi, approximately (includes 2,940 sq mi in closed basin in
<br />San Luis Valley).
<br />
<br />Average discharge.--60 years (1900-1959),649 cfs (469,900 acre-ft per year).
<br />
<br />Extremes.--1899-l959: Maximum discharge observed, l3,200cfs June 8, 1905 (gage height,
<br />9.1 1't), from rating curve extended above 8,000 cfs; no flow at times in 1950-51,
<br />1956.
<br />
<br />Remarks.--Records excellent except those for some winter months, which are fair. Natural
<br />1'loW of stream affected by transmountain diversions, storage reservoirs, ground-water
<br />withdrawals and diversions for irrigation, and return flow from irrigated areas.
<br />
<br /> Monthlv and vearlv diBchar~e in cubic feet per second
<br /> Second- Maximum Minimum Runoff
<br /> Month Mean in
<br /> foot-days daily da lly Acre-feet
<br />January. 6,006 225 130 194 11,910
<br />February 6,748 31S 200 241 13.380
<br />March. . . 6,759 358 153 21S 13,4-10
<br />April. . 6,750 160 49 114 6,750
<br />May. . . . . 1,897 111 39 61.2 3.760
<br />June . 992 47 20 33.1 1,970
<br />July . . . 375.3 40 6.C 12.1 744
<br />August . 690.2 51 7.0 22.3 1,370
<br />September. . . . 408.4- 22 7.8 13.6 810
<br />October. . . . 2,876 144 25 92.8 5,700
<br />November . . 6,832 368 78 228 13,550
<br />December . . . 7 598 280 188 245 15 070
<br />ca.Lenaar year 1~:;'~ . . . . 44,586.9 368 6.u He 88,420
<br />
<br />Rio Chama below El Vado Dam, N. Mex.
<br />
<br />Location.--Water-stage recorder, lat 36034'50", long 106043130", in Tierra Amar111a Grant,
<br />1.5 miles downstream from El Vado Dam, 2.7 miles upstream from Rio Nutrias, and 13
<br />miles southwest of Tierra Amarilla, Rio Arriba County. Datum of gage is 6,696.12 ft
<br />above mean sea level, datum of 1929. Prior to October 1935, at site 1.5 miles upstream
<br />and October 1935 to September 1938, at site 1.1 miles upstream at different datum.
<br />
<br />Drainage area.--877 sq mi.
<br />
<br />Avera~e dischar~e.--4 years (1914, 1921-23), 444 cfs prior to completion of dam; 24 years
<br />(136-59), 3 0 cfs (282,300 acre-ft per year) subsequent to completion of El Vado Dam.
<br />
<br />Extremes.--19l4-l6, 1920-24, 1936-59: Maximum discharge observed, 9,000 cfs May 22, 1920
<br />(gage height, 12 ft); no flow Mar. 25, 26, 31, 1955.
<br />
<br />Remarks.--Records are good except those for some winter months, which are poor. Diversions
<br />above station for irrigation of about 8,000 acres. Since 1935 flow regulated by
<br />E1 Vado Reservoir.
<br />
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