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<br /> RIO GRANDE COMPACT CO~SSION
<br /> RI0 GRANDE NEAR tOBATDS, COLORADO
<br />Location.- In S~C. 22, T. 33 N., R. 11 E., at h1bh~~y bridge 6 miles north of state I1ne and 10 miles east of Lobatos.
<br />Recorda available.- June 28, 1699. to December 31, 191J2.
<br />Gage.- S~evens A-55 recorder in oobblestone well 5 feet square located on right bank under bridge. On well a timber shelter
<br /> was oonstructed in March 19~4. replacing former shelter. A pitcher pump and reservoir flushing device were installed.
<br /> Reference point is slot in screw, 8et in edge of recorder she It. Elevation 12.69 feet above zero of gage. outside gage
<br /> (0-6.7') is chain on bridge. The intake has an elevation of -.05 foot. Zero of gage i8 7.426.79 ft. above mean sea level.
<br />Bench Marks.- No.1 1s point on rock (marked ~th red paint) located in front of shelter. Elevation 7.~O ft. above tero of
<br /> gage. No.2 is standsrd bronte tablet in concrete post located at base of cliff 75 ft. downstream fran shelter. Eleva-
<br /> tion is 8.29 ft, above tero of gage.
<br />Control.- No well defined control.
<br />1fI'iClii'Fge measurements.- (a) Made from two span highway bridge; low water measurements made by wading at dffle t mile up-
<br /> s'tream. ~ D) Inl~lal point is left end of uFstre~m handrail. (0) Bed composed of large boulders embedded in silt and is
<br /> fairly permanent. (d) One channel at all stages, flow smooth and well distributed in cross-section, velocity varies from
<br /> 0.5 foot per second at low stage to 5 feet per second at high stages. (e) Channel ourves slightly 200 feet upstream, ~d
<br /> is straight for 2000 feet downstream. (f) River is in a mDall canyon Which prevents overflow. (g) Conditions favorable
<br /> for accurate measurements.
<br />Floods.- See official reccrds of state Engineer's office.
<br />~of zero f10w.- Not determined.
<br />Regulations.- Flow regulated somewhat by reservoirs on headwaters. and diversions for irrigation.
<br />Dlvers1on.- Numerous diversions for irrigation above station,
<br />Aeouracy.- Witb gage heights from recorder, favorable measuring conditions, ond freq~8nt ~&surements to define slight
<br />changes in stage-d1scharge relation, records are excellent,
<br />cooperation.- Station maintained by State Engineer in cooperation with u.s.a.s.
<br />Day J~. Feb. Uar. Apr. 'oy J=. July Aug. Sept. Oct. Nov. Dec.
<br />I 470 310 390 588 2,920 4./l6O 530 68 71 61 96 2')7
<br />2 4BO 310 380 588 2;gO 4,510 !,47 66 93 66 '" 302
<br />3 500 310 370 573 2. 0 4,150 402 74 85 71 106 347
<br />4 520 310 370 611 2,500 4.250 370 76 88 71 110 302
<br />5 540 310 380 805 2.480 4.170 364 88 ,06 71 ,06 302
<br />6 S60 310 340 892 2,710 4,070 359 76 110 68 113 287
<br />7 570 310 320 1.050 ;,000 4,090 341 74 106 68 110 195
<br />8 580 310 ~ 1.040 ;,400 4,320 287 74 110 68 110 308
<br />9 580 310 1.040 ;,850 4.520 261 68 110 68 113 292
<br />10 570 310 470 955 4,280 4.950 218 66 106 68 113 308
<br />11 450 250 510 946 4/100 5,050 '95 58 106 71 110 2')2
<br />,2 400 250 600 1.140 5,2Lo 5,1~O 190 63 103 79 113 n6
<br />13 350 250 682 1.410 "hlO 5.080 204 63 90 90 134 287
<br />14 330 250 698 1.550 ,800 4,910 195 82 82 85 130 287
<br />15 325 250 690 1.860 3.990 4.960 177 71 79 82 155 347
<br />16 305 250 603 2.270 3.260 4;570 151 68 82 82 22, 402
<br />17 2<)0 250 666 2.610 2,720 4,120 il~ 63 79 79 '20') 408
<br />18 n5 250 596 2.860 2,520 3.610 66 71 79 190 376
<br />19 no 250 6n 2,970 2,;60 3.J"", 134 61 63 85 20<) 376
<br />20 250 250 642 2,110 2,;;0 3.430 130 61 66 99 209 395
<br />21 230 2<)0 603 2,270 2,4;0 3.430 123 61 61 99 209 402
<br />22 225 2<)0 603 2.150 2.680 3.320 116 58 58 103 2D4 408
<br />23 220 2')0 642 2.820 3,160 2.970 99 54 58 103 204 382
<br />24 200 2')0 698 3.750 3,610 2.480 90 ~ 58 '" 223 341
<br />25 205 2<)0 706 4,020 3.860 1,960 85 58 88 232 330
<br />26 220 2')0 635 3.690 4.340 1.51Q 79 61 58 85 228 370
<br />27 235 2')0 558 3.540 4,610 1,050 tt 66 58 96 276 341
<br />28 260 2')0 5'5 3,350 5.080 780 63 58 96 287 335
<br />~ 265 522 3.100 5.030 714 68 ~ 58 110 n6 402
<br /> ~~ ~l ;.040 ~.~~ 580 66 ~ 58 '~ 324 ~
<br /> llonth Second- Ull.ximum Uinimlllll l!ean Run-off in
<br /> foot-days acre-feet
<br />January....... ......................................... 11.245 580 200 363 22,;00
<br />February.............................................. . 1,920 283 15,710
<br />Karch........... ... .................................... 16,752 706 320 540 ;;,210
<br />April..................................... ............. 60.208 4,020 573 2.001 119.400
<br />Kay................................. ............,...... 11;,160 5,410 2,;;0 3.651 224.,500
<br />Junll............... ................:............. ...... 107 .244 5.410 580 3.575 212,100
<br />July... ......... .... ........... ..... ...... ............. 6.194 530 63 200 12,290
<br />Aug;uat.. ... ....... ........... ...... ....... ...... ....... 2.02; 88 54 65.3 4,010
<br />SlIptember... ............ ... ................................ 2.389 110 58 79.6 4.740
<br />October........... .......... ....... ......... .... ... .... 2,599 113 61 8;.8 5.160
<br />November........... ......................... ........... 5,221 1~ 1~ ;;~ 10.~~
<br />Oecember........... ............. ... .................... 10 " c::oo 20 8 0
<br /> year........................................ . 345.475 5,410 54 946 685,210
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