CHEMICAL COMPOSITION OF RIVERS AND LAKES 

 Table 14. — Analyses, in parts per million, of water from the northwestern part of the Mississippi system 



G15 



A. Iowa River at Iowa City, Iowa. Oct. 1949 to Sept. 1950. U.S. Qeol. Survey 



(1955b). 

 Cedar River at Cedar Rapids, Iowa. Oct. 1949 to Sept. 1950. U.S. Geol. 



Survey (1955b). 

 Wind River at Dubois, Wyo. Oct. 1948 to Sept. 1949. U.S. Geo]. Survey 



(1954a). 

 Wind River at Riverton, Wyo. Oct. 1948 to Sept. 1949. U.S. Geol. Survey 



(1954a). 

 Fivemile Creek near Shoshone, Wyo. Oct. 1949 to Sent. 1950. U.S. Geol. 



Survey (1955b). 

 Bighorn River at Thermopolis, Wyo. Oct. 1948 to Sept. 1949. U.S. Geol. 



Survey (1954a). 

 Little Missouri River at Medora, N. Dak. Oct. 1948 to Sept. 1949. U.S. Geol. 



Survey (1954a). 



H. Heart River near South Heart, N. Dak. Oct. 1947 to Sept. 1948. U.S. Geol 



Survey (1953a). 

 I. Grand River at Shadehill, S. Dak. Oct. 1948 to Sept. 1949. U.S. Geol. Survey 



(1954a). 

 J. Cheyenne River near Hot Springs, S. Dak. Oct. 1948 to Sept. 1949. U.S. 



Geol. Survey (1954a). 

 K. White River near Kadoka, S. Dak. Oct. 1949 to Sept. 1950. U.S. Geol. Survey 



(1955b). 

 L. South Platte River at Julesburg, Colo. Oct. 1948 to Sept. 1949. U.S. Oeol. 



Survey (1954a). 

 M. Republican River at Trenton, Kans. Oct. 1948 to Sept. 1949. U.S. Oeol. 



Survey (1954a). 

 N. Saline River near Wilson, Kans. Feb. 1918 to Sept. 1950. U.S. Geol. Survey 



(1955b). 



A. St. Francis River at Marked Tree, Ark. Nov. 1949 to Sept. 1950. U.S. Geol. 



Survey (1954c). 



B. White River at Batesville, Ark. Oct. 1945 to Sept. 1946. U.S. Geol. Survey 



(1950 [1951]). 



C. Black River at Black River, Ark. Oct. 1945 to Sept. 1946. U.S. Geol. Survey 



(1950 [1951]). 



D. White River at Newport, Ark. Oct. 1949 to Sept. 1950. U.S. Geol. Survey 



(1954c). 



E. Little Red River near Heber Springs, Ark. Nov. 1949 to Sept. 1950. U.S. Geol. 



Survey (1954c). 



F. Cimarron River at Ute Park, N. Mex. Oct. 1949 to Sept. 1950. U.S. Geol. 



Survey (1954c). 



G. Arkansas River at Dardanelle, Ark. Oct. 1948 to Sept. 1949. U.S. Geol. Survey 



(1953b) . 



RIO GRANDE BASIN 



Rainfall is light in the Rio Grande basin and most of 

 its waters are quite concentrated, at least during 

 seasons of low discharge. Representative data pre- 

 sented in table 16 show that the more dilute waters, 

 with total dissolved salts less than 1,000 ppm, tend to 

 be calcium bicarbonate ones, whereas the more con- 

 centrated waters, such as waters from the Pecos, are domi- 

 nated by calcium sulfate or sodium sulfate. The more 

 concentrated stations on the Pecos have a high content 

 of chloride as well, partly because of the regional lith- 

 ology, but none of the rivers can be characterized as a 

 sodium chloride water as table 17 shows, although there 

 are sodium chloride waters, at least locally, in the Rio 

 Grande basin. 



H. Mississippi River at New Orleans. Mean of 52 composite samples taken daily 

 between Apr. 23, 1905 and Apr. 28, 1906. J. S. Porter, analyst. Recalculated 

 from Clarke, 1924b. 



I. Mississippi River just above bridge on U.S. Highway 190, near Baton Rouge, 

 La. March 13, 1959. Durum, Heidel, and Tison, 1960. Analysis also in- 

 cludes Ag, 0.000 ppm; Al, 1.010 ppm; B, 0.015 ppm; Ba, 0.072 ppm; Co, 0.000 

 ppm; Cr, 0.006 ppm; Cu, 0.0090 ppm; Li, 0.0018 ppm; Mn, 0.04R ppm; Mo, 0.000 

 ppm; Ni, 0.013 ppm; P, <0.184 ppm; Pb, 0.004 ppm; Rb, 0.0074 ppm; Sr, 0.061 

 ppm; Ti, 0.072 ppm; V, <0.0055 ppm; and Zr, 0.000 ppm. 



J. Ouachita River near Malvern, Ark. Oct. 1946 to Sept. 1947. U.S. Geol. Survey 

 (1952). 



K. Ouachita River at Arkadelphia, Ark. Oct. 1959 to Sept. 1950. U.S. Geol. 

 Survey (1954c). 



L. Smackover Creek near Smackover, Ark. Oct. 1949 to Sept. 1950. U.S. Geol. 

 Survey (1954c). 



COLORADO RIVER BASIN 



Precipitation in the basin of the Colorado River is 

 spatially variable. This variability is reflected in the 

 quality of its water. Even the few selected data in 

 table 18 show a twentyfold range in the yearly mean 

 concentration of two rivers. Once again the dilute 

 waters are calcium bicarbonate, with sodium, sulfate, 

 and chloride important where the concentration is 

 greater. 



NORTE AMERICAN CLOSED BASINS 



The waters of the closed basins of western North 

 America may be conveniently considered as a unit. 

 Some of the more nearly complete recent analyses are 

 presented in tables 19, 20, 21, and 22. (See also Lenore 

 Lake and Soap Lake, table 23.) Additional analyses 



