INTRODUCTIDN 



The purpose of the Columbia River Stream Survey has been to provide 

 data for the evaluation of each stream, or portion of stream, from the 

 standpoint of its present and potential value in relation to the main- 

 tenance of the salmon resources of the Columbia River o 



Two reports— 'have been published to date, this being the third of 

 the series. This report deals with the streams in Area II, as shovm in 

 Figure 1. Area II includes all tributaries entering the Columbia River 

 on the south, or Oregon side, in the 20/+ miles from the mouth up to but 

 not including the Deschutes River. The Area as a vrtiole is assuming an 

 ever increasing degree of importance owing to the construction of dams 

 in the middle and upper reaches of the Columbia River and its principal 

 tributaries. The Area, particularly the part west of the Cascade Ifoun- 

 tains, is especially suited for the propagation of salmon and steelhead 

 trout because of its geographic and climatic conditions.. Hovvever, the 

 runs in manj'- of the tributaries have been reduced from their former level 

 of abundance due to logging operations and to pollution o The abundance 

 level of the fish populations might be materially increased by the clear- 

 ing of log jams., abatement of pollution, screening of diversions, and 

 other stream improvements . Such improvements are at present being cari'ied 

 on, both in this Area and in Area I, under the lower Columbia River devel- 

 opment program. 



PART I 



BEXDYiT BONIIEVILLE DAJI (excluding the Willamette River) 



Introduction 



This sub-area is bordered closely by the low rugged hills and moun- 

 tains of the Coast Range, Most of the' streams in this section are com- 

 paratively short and of small volume o The upper portions of most of 

 these streams are steep and at present are blocked by falls impassable to 

 salmon. The lovrer portions often run through flood plains bordering the 

 Columbia River. Most of these alluvial flats have been diked and are in- 

 tensively farmed. Where streams pass through the dikes tide gates have 

 been constructed which interfere with the passage of fish at certain 

 tidal stages . These tide gates should be studied v/ith the aim of provid- 

 ing a more satisfactory passage for fish. The slough-like nature of the 



1/ Rich, V/illis H., A Survey of the Columbia River and its Tributaries 

 yiith Special Reference to the Management of its Fisliery Resources - No. 1. 

 Introduction: Fish and Wildlife Service, Special Scientific Report No. 51, 

 J^y 194.8, p. 1-25. 



Bryant J Floyd Go, A Sur-vey of the Columbia River and its Tributaries 

 with Special Reference to its Fishery Resources - No. 2. Washington Streams 

 from the mouth of the Columbia River to and including the Klickitat River 

 (Area I)j Fish and Wildlife Seirvice, Special Scientific Report No. 62, 

 January 194.9, p. 1-110. 



