HOOD KIVER-WHITE SALMON EIVER AREA. 



29 



river either by the alluvial soil along the streams or by narrow areas 

 of Rough stony land. 



The drainage of the phase is commonly deficient. This is due both 

 to the seepage of water from the higher lands and to retarded internal 

 drainage, which frequently results from the presence of the under- 

 lying cemented material. A small body of land mapped as the 

 eroded phase of the Rockford stony clay loam and occuriing upon 

 the Washmgton side of the Columbia River in the ^dcinity of Bmgen 

 is of doubtful glacial origin. The area covered is, however, of small 

 extent and of little agricultural value and does not depart greatly 

 from the bodies u])on the Oregon side m character of soil, topography, 

 or agricultural utilization. 



The tillable jjortions of the eroded phase are confined to small, 

 scattered areas where the cemented substratum does not lie near the 

 surface and where the amount of rock is not so large as to prevent its 

 economical removal. 



The following table gives the average results of mechanical analyses 

 of typical samples of the soil and subsoil: 



Mechanical analyses of Rockford stony clay loam. 



ROCKFORD CLAY. 



The Rockford clay consists of 6 to 12 inches of a light-brown to 

 reddish-brown clay, with a texture approaching that of a heavy clay 

 loam. The soil is rather compact, but under favorable conditions is 

 capable of being maintained m friable tilth. The subsoil is a compact, 

 tenacious clay, varying from red or reddish brown in the upper to 

 yellowish brown m the deeper part. No gravel is encountered in 

 this type, pellets are rare, and glacial bowlders are present only in 

 small quantities either within the body of the type or along the 

 boundary between it and the Rockford stony clay loam. 



In parts of this type the surface soil has a distmct red color, not 

 typical of the Rockford series. The areas of such soil, however, are 

 too small to warrant map])ing them as a distinct type. 



Only one body of Rockford clay is found m the area. This occurs 

 in the western part of the Hood River Valley, between the slopes of 

 the momitains and the main body of the Rockford stony clay loam. 

 The type occupies a number of well-developed ridges or rolhng eleva- 

 tions between which there are a number of small drainage ways, and 



