Figures 

 Landf onn Groups 



Legend 



C' '3 WXcrahcdBoimitaty 



/ \_/ Streams 



Landfonn Groups 



^^^ Breaklands 



^^ Gentle-Mod Slope GImuI 



^^ Mounudn Slopes & Ridges 



Sleep Alpine Cladal 

 4^ Valcy Bottoms 



The riparian vegetation is dominantly Abies lasiocarpa/Streptopus amplexifolius, Abies 

 lasiocarpa/Calannagrostis canadensis and Picea/Cornus stolonifera riparian habitat types. 



Under disturbed conditions the nitrogen yield is moderate and the phosphorus yield is high. The 

 exceptions to these ratings are on coarse textured outwash materials, which have low phosphorus 

 ratings because of their low erosion hazard. Sensitive soils occur on the wet, poorly drained flood 

 plains and lacustrine deposits, and are a minor portion of this landform. 



Breaklands - (1 3,370 acres, 22.8% of Big Creek) 



Breaklands occur in both upland and alpine landscape settings and are typically composed of structural 

 breaklands and stream breaklands. The dominant slopes have gradients of 55 to 70 percent. Parent 

 materials are volcanic ash overlying bedrock composed of argillites, siltites, quartzites, dolomites, and 

 limestones. The structural breaklands are formed in colluvial materials from weakly weathered meta- 

 sedimentary bedrock. The dominant soils are shallow to moderately deep with very gravelly loam 

 textures. The vegetation is a mosaic of coniferous forest, and mountain shrub/grass lands. 



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