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<br />'2 FLOODS OF SEPT. 1970 IN ARIZ., UTAH, COLO., AND N. MEX.
<br />
<br />(36) 09358900. Mineral Creek above SilverI on, Colo.
<br />
<br />Location. --Lat 37051'04", long 107<'43'31", San Juan County, on right bank 200 ft (60 m)
<br />upstt'eam from bridge, 0.6 roi (1. 0 km) upstream from Middle Fork, and 4.3 rot
<br />(6.9 Ion) northwest of Silverton.
<br />
<br />Drainage area. --11. 0 mi2 (28.5 km2).
<br />Gage-height record. --Water-stage recorder graph except 1900 hours Sept. 5 to 1315 hours
<br />Sept. 9 and 0400 hours to 2300 hours Sept. 13. Peak stage determined from high-water
<br />mark near gage well. Altitude of gage is 9,980 ft (3,042 m), from topographic map.
<br />
<br />Discharli:e record. --Stage-discharge relation defined by current-meter measut'ements
<br />below 52 ftJfs (1. 47 m3/a), Discharge. 1900 hours Sept. 5 to 1315 hours Sept. 9 and
<br />0400 hours to 2300 hours Sept. 13. estimated on basis of peak discharge. two discharge
<br />meaiSurements. and records for nearby stations.
<br />
<br />Maxima. ~-Sept. 4-18. 1970: Discharge. 750 ft3/s (21. 2 m3/s) Sept. 5 (gage h('ight.
<br />----;r.soft or 1. 372 m, from noodmark), by slope-area measurement of peak flow.
<br />1968 to August 1970: Discharge, 190 ft3/s or 5.38 m3fs (estimated) May 17, 1970
<br />(gage height not determined).
<br />
<br /> Mean discharge, in cubic feet per second, 1970
<br />Day Discharge Day Discharge Day Discharge
<br />Sept. 4 15 Sept. 9 33 Sept. 14 46
<br /> 5 400 10 30 15 33
<br /> 6 210 11 27 16 30
<br /> 7 100 12 32 17 25
<br /> 8 60 13 80 18 22
<br />
<br />Gage height, in feet. and discharge, in cubic feet per second, at indicated time, 1970,
<br />of Mineral Creek above Sil vertoD, Colo.
<br />
<br />Hour Gage Discharge Hour Gage Discharge Hour Gage Discharge
<br /> height height height
<br />Sept. 4 Sept. 11 Sept. 13' Con.
<br />2400 1. 18 18 2400 1. 30 25 2400 1. 70 60
<br />Sept. 5 Sept. 1" Sept. '"
<br />1000 l.16 17 0600 1. 30 25 1200 1. 59 46
<br />1200 1. 40 30 1330 1. 28 24 2400 1.52 38
<br />1400 1.65 54 1800 1.65 59
<br />1600 1.75 70 1930 1.55 46
<br />1700 1. 50 38 2200 1. 48 38
<br />1800 1.65 54 2400 1. 49 39
<br />1900 2.20 180 Sept. 13'
<br />Sept. 9 0200 L 60 52
<br />1315 1. 44 35 0400 1. 60 52
<br />2400 1. 41 32 2300 1. 70 60
<br />
<br />'" Daily means computed from data 10 addltion to figures shawn.
<br />(37) 09359000. Mineral Creek near Silverton. Colo.
<br />
<br />(Gaging station, discontinued 1949)
<br />
<br />Location.--Lat 37~48'50", long 107"41'45", in sec. 13, T. 41 N., R. 8 W., 50' ft (I5 m)
<br />from U. S. Highway 550, 300 ft (90 m) upstream from Bear Creek, and 2 mi (3 km)
<br />west of Silver-ton.
<br />
<br />Drainage area. --44. 3 mi2 or 114.7 km2 (revisE'd).
<br />
<br />Gage-height record. --Floodmarks only. Datum of gage is 9.399.04 ft (2,864.827 m)
<br />above mean sea If'vel, datum of 1929.
<br />
<br />Maxima. --Sept. 5-14, 1970: Discharge, not determined 0900 hours Sept. 5 (gage
<br />height, 8.5 ft or 2.59 m. from floodmarks).
<br />1935-49: Discharge, 1,700 ft3/s (48. 1 m3fs) June 29, 1938 (gage height,
<br />4.69 ft or 1. 430 m), from rating curve extE'nded above 750 ft3/s (21. 2 m3/s).
<br />M.,~;....."..... finnn 1"'lrr'viOll.o:;lv known occurred Oct. 5, 1911.
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<br />I
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<br />STATION DATA-SAN JUAN RIVER BASIN
<br />
<br />73
<br />
<br />(38) Mineral Crl'ek at Silverton. Colo.
<br />
<br />(Miscellaneous site)
<br />
<br />Location. --Lat 37~48'27tt, long 107"40'39" (unsurveyed), San Juan County. 0" 5 mi (0. 8 Ion
<br />west of Silver ton and O. 7 mi (1. 1 km) upstream from mouth.
<br />
<br />Drainagl;' area. ~ -51. 7 mi2 (133.9 km2).
<br />
<br />Maximum. --Sept. 4-18, 1970: Discharge, 3,070 ft3fs (86.9 m3/s) 0900 hOurs Sept. 5,
<br />by slope-area measurement of peak flow.
<br />
<br />(39) 09359500. Animas River above Tacoma, Colo.
<br />
<br />(Gaging station, discontinued 1956)
<br />
<br />Location. --Lat 3'P34'10", long 107046'4011, in sec. 8, T. 38 N., ft. 18 W., on left bank
<br />0.8 mi (1. 3 km) upstream from Tank Creek, 2.4 mi (3.9 km) downstre<tm from
<br />Cascade Creek. and 3.3 mi (5.3 km) north of Tacoma,
<br />Drainage area. --348 mi2 (901 km2).
<br />
<br />Gage-height record. --Floodmark only. Altitude of gage is 7,520 ft (2,292 m), from
<br />topographic map.
<br />
<br />4-18, 1970: Discharge, about 12,500 ft3/s (354 ru3/s) Sept. 6 (gage
<br />ft or 3.063 m), from rating curve extended abo\"e 5,700 ft3/s
<br />
<br />Maxima. --Sept.
<br />height. 10.05
<br />(160 m3/s).
<br />1945-56: Maximum discharge,
<br />height, 8.86 ft or 2. 701 m), from
<br />(160 m3/s).
<br />Maximum flood previously known occurred Oct.
<br />
<br />9,500 ft3/s (269 m3/s) June 18, 1949 (gage
<br />rating curve extend~d above 5.700 ft3/s
<br />
<br />5,1911.
<br />
<br />(40) 09361000. Hermosa Creek near Hermosa, Colo.
<br />
<br />Location. --Lat 37025'20". long 107"50140", in NWt sec. 3, T. 36 N., R.9 W.. La
<br />Plata County. on right bank 20 ft (6 m) downstream from private bridge, 1 mi
<br />(2 Ian) northwest of Hermosa, and 2 mi (3 km) upstream from mouth,
<br />
<br />Drainage area. --172 mi2 (445 km2).
<br />
<br />Gage-height record. -~Water-stage recorder graph. Datum of gage is 6,705,88 ft
<br />(2,043.952 m) above mean sea level.
<br />
<br />Discharge record. --Stage-discharge relation defined by current-meter measurements
<br />below 1,800 ftJ/s (51 m3/s), '
<br />
<br />Maxima. --Sept. 4-18, 1970: Discharge, 1,700 ft3/s (48. 1 m3/sl 0130 hours Sept. 6
<br />(gage height. 4.20 ft or 1. 280 m).
<br />1912-14, 1919-28, 1939 to August 1970: Discharge, 2,980 ft3/s (84.4 m3/s)
<br />May 12, 1941 (gage height, 6.02 ft or 1. 835 m); gage height, 8,50 ft (2. 591 m)
<br />Sept. 12. 1927, from noodmarks, at site within 0, 5 mi (0. 8 km) at different
<br />datum.
<br />
<br /> Mean discharge, in cubic feet per second, 1970
<br />Day Discharge Day Discharge Day Discharge
<br />Sept, 4 48 Sept. 9 171 Sept. 14 380
<br /> 5 299 10 139 15 300
<br /> 6 980 11 115 16 228
<br /> 7 352 12 138 17 189
<br /> 8 220 13 337 18 159
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