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10 THE ARKA~SAS RIVEItFL(fOD OF JUNE 3-51021 ., . ,. Of the 28,000 square miles drained by Arkansas River in Colorado the upper 3,840 square miles is mountain:ous, .with extremely rugg~d topography. Within this upper area there are many perennial tribu- taries, but east of the mountains the tributaries are r~latively small except in time of spring high water from melting snow. or, after hea vy rains. The area covered by the rainfall of June 2-5, 1!>21, lies chiefly be- . tween Canon City and Pueblo. It is bounded on the north by the foothills of the Pikes Peak uplift and on the south by the Wet :Moun- tains and their extension, Greenhorn Mountain. The following de- sJription of the topography is quoted from Gilbert: ~ , Ifwenty miles south of Colorado Springs the line of f~othl11s turns sharply westward for 20 miles and theil, Ileal' Canon City, swings quickly to the south anll southeast, hollllllg the latt..r course for 40 miles. Within this flexure is Il triangular tongue of the plains country half SUrrOl1l1111'11 hy mOllntain ranges. For half its cour.;e between Cnnon City am! I'u..!>I" the Arkam<as I.. c1osel)' "- hemmed in by rock bluffs 200 feet high. with cliffs of lime.;tolle nt the top. Else- where its'immediate valley is more open, usually with II. sharp ascent on ,one side to a gravelly mesa and a long, gradual slope on the other. Farther back the ascent"is broken by terruces of grayel or sand or hy tracts of clay~y had- lands nlld here and there by rocky cliffs and mesas. . . Within this area there are many tributaries that rise in the moun- tains that bound the drainage basin. . The tributaries fromthe north are Oil, Sixmile, Eightmile, Brush ,Hollow, Beaver, Turkey, and Dry creeks, and those from the south are Chandler, Oak, Coal, Hard- scrabble, Red, Rush, Pecks, and Rock creeks... . . . . . .' Between the steep slopes of the vVet Mountains and the river a broad area known generally as Boggs Flat slopes toward the river. Across this area the tributary streams heading in the mountains have cut well-defined channels. In addition to these streams a number of arroyos or dry channels, of which Ritchie Gulch; Osteen and Cameron arroyos, Boggs and Blue Ribbon creeks are. the chief, rise in the upland area and carry water during the heavy rains to which this area is subjl!ct. The following table was compiled chiefly from topographic maps: . Glihert. n, K.. l'nderjITOlllld wnter or the Arkan.n. Valley In en.tern Colorado: U.' S. Gee!. Survey Seventeenth Ann. Rept., pt. 2, p. r.r.R, 1 RllG. , ~ .