compariBon. From 1910-1950, the population 

 increased from 6,200 to 12,000 and the irri- 

 gated acreage from 19,000 to 26,000 acres. 

 These ""'^n increases together with logging 

 constitute the only changes in the water- 

 shed during this 40-year period. It is 

 then to be anticipated that the water qual- 

 ity in 1910 would be about the same as in 

 1955. From table 2k of weighted averages 

 and figures 52 and 53, a wnan increase in 

 ftiT constituents other than sulfates is 

 noted. On a percentage basis, thejncreases 

 were: Alkalinity - 2k} hardness - 22; total 

 solids - 16; calcium plus magnesium - 11; 

 sodium plus potassium - 3; color - 6O; tur- 

 bidity - 21; and iron - UOO. Sulfates 

 decreased 71 percent. The Increase in color 

 may be due largely to fruit tree leaves and 

 the replacement of coniferous trees with 

 deciduous following logging. The increase 

 in iron is to be questioned as the iron 

 data for 195^-56 is meager. Irrigation 

 developments were reaching their maximum 

 around I910 on the Henatchee River. A lapld 

 leeching of sulfate -bearing salts into the 

 river at this time may account for the sub- 

 sequent decrease in sulfates. 



Yakima River at Cle Blum , 

 Figures 5^^ and 55, Table a ; 



The Yakima River at Cle ELum offers 

 an interesting ccmpao-ison in water quality 

 with the passage of time. Watershed popu- 

 lation has decreased slightly because of 

 the decline in coal mining around Roslyn. 

 Increased storage for Irrigation in Lake 

 Keechelus, Cle Elum and Kachess has leo^ely 

 taken place since I910. Logging on the 

 watershed has increased since I9IO. 



All water quality constituents have 

 decreased slightly excepting for alkalin- 

 ity, iron and nitrates. This decrease may 

 be attributed to a reduction in coal -wash- 

 ing wastes and the 829,000 acre -feet of 

 Impoundment created since I9IO. The per- 

 centage decrease was as follows: Hardness 



- 16; dissolved solids - 17; sulfate - 76; 

 calcium plus magnesium - 13; sodium plus 

 potassium - 19; chlorides - 27; and silica 



- 26. Alkalinity increased k, iron 50 

 and nitrate 88 percent. The increase in 

 nitrate is probably due to organic decompo- 

 sition in the Impoundments. An increase 



Table 21. — ^Water quality conparison. 



TaMma River at Cle Elum, 1910-11 (U.S.G.S.) 



In P. P.M. 



riau X 1,000. 



ToUl Alk/'' 



Sulfat« 



Color 



Dla'l. Sollda 



Ka ♦ X 



C« t Kg 



Iron (Fo) , , 



Total Hardnsss^-'^ 



Slllea 



Chlorldoo (CI") 



aitrate (IIO3-} 



J«n« Feb. 



JtaTt 



April Ihar iva» July Aog» 



JSEi. 



Ooto 



MoT« Doe. 



ll 



0.9 

 25 

 6.7 



lib 

 3.1 



10.1 



I 



29 



6.3 



0.U 



3 

 1.1 



30 

 8.5 



56 



8.8 

 0.15 



26 



111 

 0.5 

 0,03 



3 

 3.0 



IB 

 8.3 

 3 



52 

 3.3 

 9.1 

 0.03 



28 



12 

 1.0 

 0.28 



3 

 5.7 



22 

 6.6 

 3 



U9 

 3.9 

 8.0 

 0.01 



26 



11 

 1.5 

 0.1 



3 



5.3 

 25 



5.6 



2 

 U5 



U.U 



8.0 



0.01 

 23 

 U 



1.6 



t 



3 

 2.5 

 26 



5.U 



62 

 U.3 

 8.0 

 0.01 



23 



111 

 2.U 

 t 



3 

 1.1 

 26 



U.5 



U9 

 5.0 

 8.0 

 0.01 



23 



10 

 2.6 

 T 



3 



1.0 



31 



U.3 



I16 



lu6 

 10.2 



T 

 30 



1 



3 



0.5 

 33 

 6.9 



U9 



3.3 

 11.0 



0.01 

 33 

 10 



1-5 



3 

 i.i» 



2li 

 6.1 



ui 



3.9 



8.2 

 0.01 

 2U 

 7.7 



2-1 

 0.^3 



3 



lt.2 

 20 



U.o 



39 

 2.6 



7.7 

 0.02 

 22 

 7.7 



a 



3 



1.6 



22 



8.5 



UO 

 2.7 



8.6 

 T 

 25 

 7.1* 

 1.0 

 T 



Tines Soplad^^' 

 ri0w X 1,000 . 

 Total ilk. '''' 

 Total Bardnss^^} 

 Dla'l. SoUda 

 Ca « K( 

 la ♦ K 

 Stilfato 

 Iron (To) 

 SiUoa 



Chlorides (C1-) 

 Bltrate (HD3-) 

 Color 



Yakiina River at Cle Elum, 1952-53 (U.S.G.S.) 



3 



0.61 

 30 



S 



10.1 

 3.1. 

 2.0 

 O.Olj 

 9.8 

 1.3 

 0.6 

 5 



1 



1.07 

 30 

 21I 

 140 



8.U 



3.0 



2.0 



O.Olt 



9.9 



1.2 



0.7 



U 



3 



0. 



31 

 29 

 U7 

 ID. 



3. 



2. 



0. 



9. 



1. 



0.! 



5 



58 



3 

 1.31 



26 



th 



38 

 8.5 

 3.3 

 1-8 



0.02 



8.5 



1.0 



O.lt 



7 



3 



0.71 



30 



28 



1.5 

 9.5 

 3.2 

 1.9 

 0.03 



10.7 

 1.1 



o.k 



3 



2.87 

 25 

 23 

 35 



8.1 

 3.2 

 3.2 



o.ot. 

 7.6 

 1.0 

 0.1. 



5 



60 



3 

 2 



25 



25 



33 

 8.3 

 1.9 

 2.2 

 0.03 

 7.0 

 1.1 

 O.U 

 6 



3 



2.76 



23 



27 



33 

 9.0 

 1.5 

 1.9 

 0.03 

 7.0 

 1.7 

 0.6 

 9 



3 



1.96 

 23 

 25 

 33 



8.3 



1.7 



2.0 



0.02 



6,9 



1.0 



0.6 



7 



0.62 0.11 0.13 



1) Each sample roprssants composite of IC or nore dally sainplss. 



I! 



As p.p.B/^ CaCOi 



Ccnputed from Ca « Kg as CaCOi. 



79 



